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  • 1. Aalbers, J.
    et al.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Amsler, C.
    Aprile, E.
    Arazi, L.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Benabderrahmane, M. L.
    Berger, T.
    Beskers, B.
    Breskin, A.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Butikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics.
    Cussonneau, J. P.
    Decowski, M. P.
    Diglio, S.
    Drexlin, G.
    Duchovni, E.
    Erdal, E.
    Eurin, G.
    Ferella, Alfredo
    Stockholm University, Faculty of Science, Department of Physics.
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Di Gangi, P.
    Di Giovanni, A.
    Galloway, M.
    Garbini, M.
    Geis, C.
    Glueck, F.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hannen, V.
    Hogenbirk, E.
    Howlett, J.
    Hilk, D.
    Hils, C.
    James, A.
    Kaminsky, B.
    Kazama, S.
    Kilminster, B.
    Kish, A.
    Krauss, L. M.
    Landsman, H.
    Lang, R. F.
    Lin, Q.
    Linde, F. L.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut D.
    Stockholm University, Faculty of Science, Department of Physics.
    Morteau, E.
    Murra, M.
    Naganoma, J.
    Newstead, J. L.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics.
    de Perio, P.
    Persiani, R.
    Piastra, F.
    Piro, M. C.
    Plante, G.
    Rauch, L.
    Reichard, S.
    Rizzo, A.
    Rupp, N.
    Dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schumann, M.
    Schreiner, J.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M. C.
    Simgen, H.
    Sissol, P.
    von Sivers, M.
    Thers, D.
    Thum, J.
    Tiseni, A.
    Trotta, R.
    Tunnell, C. D.
    Valerius, K.
    Vargas, M. A.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wester, T.
    Wulf, J.
    Zhang, Y.
    Zhu, T.
    Zuber, K.
    DARWIN: towards the ultimate dark matter detector2016In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 11, article id 017Article in journal (Refereed)
    Abstract [en]

    DARk matter WImp search with liquid xenoN (DARWIN(2)) will be an experiment for the direct detection of dark matter using a multi-ton liquid xenon time projection chamber at its core. Its primary goal will be to explore the experimentally accessible parameter space for Weakly Interacting Massive Particles (WIMPs) in a wide mass-range, until neutrino interactions with the target become an irreducible background. The prompt scintillation light and the charge signals induced by particle interactions in the xenon will be observed by VUV sensitive, ultra-low background photosensors. Besides its excellent sensitivity to WIMPs above a mass of 5 GeV/c(2), such a detector with its large mass, low-energy threshold and ultra-low background level will also be sensitive to other rare interactions. It will search for solar axions,galactic axion-like particles and the neutrinoless double-beta decay of Xe-136, as well as measure the low-energy solar neutrino flux with <1% precision, observe coherent neutrino-nucleus interactions, and detect galactic supernovae. We present the concept of the DARWIN detector and discuss its physics reach, the main sources of backgrounds and the ongoing detector design and R&D efforts.

  • 2. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Itay, R.
    Kaminsky, B.
    Kazama, S.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Garcia, D. Ramirez
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M.
    Simgen, H.
    Sivers, M. V.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Vargas, M.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Search for bosonic super-WIMP interactions with the XENON100 experiment2017In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 12, article id 122002Article in journal (Refereed)
    Abstract [en]

    We present results of searches for vector and pseudoscalar bosonic super-weakly interacting massive particles (WIMPs), which are dark matter candidates with masses at the keV-scale, with the XENON100 experiment. XENON100 is a dual-phase xenon time projection chamber operated at the Laboratori Nazionali del Gran Sasso. A profile likelihood analysis of data with an exposure of 224.6 live days x34 kg showed no evidence for a signal above the expected background. We thus obtain new and stringent upper limits in the (8-125) keV/c(2) mass range, excluding couplings to electrons with coupling constants of g(ae) > 3 x 10(-13) for pseudo-scalar and alpha'/alpha > 2 x 10(-28) for vector super-WIMPs, respectively. These limits are derived under the assumption that super-WIMPs constitute all of the dark matter in our galaxy.

  • 3. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Grandi, L.
    Greene, Z.
    Qiu, H.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Itay, R.
    Joerg, F.
    Kaminsky, B.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Plante, G.
    Podviianiuk, R.
    Priel, N.
    Garcia, D. Ramirez
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Dark Matter Search Results from a One Ton-Year Exposure of XENON1T2018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 11, article id 111302Article in journal (Refereed)
    Abstract [en]

    We report on a search for weakly interacting massive particles (WIMPs) using 278.8 days of data collected with the XENON1T experiment at LNGS. XENON1T utilizes a liquid xenon time projection chamber with a fiducial mass of (1.30 +/- 0.01) ton, resulting in a 1.0 ton yr exposure. The energy region of interest, [1.4; 10.6] keV(ee) ([4.9; 40.9] keV(nr)), exhibits an ultralow electron recoil background rate of [82(-3)(+5) (syst) +/- 3 stat)] events/ton yr keV(ee)). No significant excess over background is found, and a profile likelihood analysis parametrized in spatial and energy dimensions excludes new parameter space for the WIMP-nucleon spin-independent elastic scatter cross section for WIMP masses above 6 GeV/c(2), with a minimum of 4.1 x 10(-47) cm(2) at 30 GeV/c(2) and a 90% confidence level.

  • 4. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Antunes, B.
    Arneodo, F.
    Balata, M.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breskin, A.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Chiarini, A.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Corrieri, R.
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Disdier, J. -M.
    Doets, M.
    Duchovni, E.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Front, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Giboni, K. -L.
    Goetzke, L. W.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Huhmann, C.
    Itay, R.
    James, A.
    Kaminsky, B.
    Kazama, S.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Maier, R.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Orlandi, D.
    Othegraven, R.
    Pakarha, P.
    Parlati, S.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Garcia, D. Ramirez
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Saldanha, R.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    von Sivers, M.
    Sterne, M.
    Stein, A.
    Tatananni, D.
    Tatananni, L.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Walet, R.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    The XENON1T dark matter experiment2017In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 12, article id 881Article in journal (Refereed)
    Abstract [en]

    The XENON1T experiment at the Laboratori Nazionali del Gran Sasso (LNGS) is the first WIMP dark matter detector operating with a liquid xenon target mass above the ton-scale. Out of its 3.2t liquid xenon inventory, 2.0t constitute the active target of the dual-phase time projection chamber. The scintillation and ionization signals from particle interactions are detected with low-background photomultipliers. This article describes the XENON1T instrument and its subsystems as well as strategies to achieve an unprecedented low background level. First results on the detector response and the performance of the subsystems are also presented.

  • 5. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arazi, L.
    Arneodo, F.
    Balan, C.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Johannes Gutenberg-Universität Mainz, Germany.
    Berger, T.
    Breur, P.
    Breskin, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Butikofer, L.
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics.
    Contreras, H.
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Duchovni, E.
    Fattori, S.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. INFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Italy.
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Galloway, M.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Gross, E.
    Hampel, W.
    Hasterok, C.
    Itay, R.
    Kaether, F.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Le Calloch, M.
    Levy, C.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Lyashenko, A.
    Macmullin, S.
    Manfredini, A.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Mayani, D.
    Fernandez, A. J. Melgarejo
    Meng, Y.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Oberlack, U.
    Orrigo, S. E. A.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics.
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Simgen, H.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    von Sivers, M.
    Wall, R.
    Wang, H.
    Weber, M.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Zhang, Y.
    Physics reach of the XENON1T dark matter experiment2016In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 4, article id 027Article in journal (Refereed)
    Abstract [en]

    The XENON1T experiment is currently in the commissioning phase at the Laboratori Nazionali del Gran Sasso, Italy. In this article we study the experiment's expected sensitivity to the spin-independent WIMP-nucleon interaction cross section, based on Monte Carlo predictions of the electronic and nuclear recoil backgrounds. The total electronic recoil background in 1 tonne fiducial volume and (1, 12) keV electronic recoil equivalent energy region, before applying any selection to discriminate between electronic and nuclear recoils, is (1.80+/-0.15) . 10(-4) (kg.day.keV)(-1), mainly due to the decay of Rn-222 daughters inside the xenon target. The nuclear recoil background in the corresponding nuclear recoil equivalent energy region (4, 50) keV, is composed of (0.6 +/- 0.1) (t.y)(-1) from radiogenic neutrons, (1.8+/-0.3) . 10(-2) (t.y)(-1) from coherent scattering of neutrinos, and less than 0.01 (t.y)(-1) from muon-induced neutrons. The sensitivity of XENON1T is calculated with the Pro file Likelihood Ratio method, after converting the deposited energy of electronic and nuclear recoils into the scintillation and ionization signals seen in the detector. We take into account the systematic uncertainties on the photon and electron emission model, and on the estimation of the backgrounds, treated as nuisance parameters. The main contribution comes from the relative scintillation efficiency L-eff, which affects both the signal from WIMPs and the nuclear recoil backgrounds. After a 2 y measurement in 1 tonne fiducial volume, the sensitivity reaches a minimum cross section of 1.6 . 10(-47) cm(2) at m(chi) = 50 GeV/c(2).

  • 6. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Gardner, R.
    Geis, C.
    Goetzke, L. W.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Itay, R.
    Kaminsky, B.
    Kazama, S.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Riedel, B.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    Saldanha, R.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    von Sivers, M.
    Stein, A.
    Thapa, S.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Vargas, M.
    Upole, N.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    First Dark Matter Search Results from the XENON1T Experiment2017In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 18, article id 181301Article in journal (Refereed)
    Abstract [en]

    We report the first dark matter search results from XENON1T, a similar to 2000-kg-target-mass dual-phase (liquid-gas) xenon time projection chamber in operation at the Laboratori Nazionali del Gran Sasso in Italy and the first ton-scale detector of this kind. The blinded search used 34.2 live days of data acquired between November 2016 and January 2017. Inside the (1042 +/- 12)-kg fiducial mass and in the [5, 40] keV(nr) energy range of interest for weakly interacting massive particle (WIMP) dark matter searches, the electronic recoil background was (1.93 +/- 0.25) x 10(-4) events/(kg x day x keV(ee)), the lowest ever achieved in such a dark matter detector. A profile likelihood analysis shows that the data are consistent with the background-only hypothesis. We derive the most stringent exclusion limits on the spin-independent WIMP-nucleon interaction cross section for WIMP masses above 10 GeV/c(2), with a minimum of 7.7 x 10(-47) cm(2) for 35-GeV/c(2) WIMPs at 90% C.L.

  • 7. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Johannes Gutenberg-Universität Mainz, Germany.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Le Calloch, M.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Piro, M. -C.
    Pizzella, V.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    Saldanha, R.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Sivers, M. V.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Laubenstein, M.
    Nisi, S.
    Material radioassay and selection for the XENON1T dark matter experiment2017In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 12, article id 890Article in journal (Refereed)
    Abstract [en]

    The XENON1T dark matter experiment aims to detect weakly interactingmassive particles (WIMPs) through low-energy interactions with xenon atoms. To detect such a rare event necessitates the use of radiopure materials to minimize the number of background events within the expected WIMP signal region. In this paper we report the results of an extensive material radioassay campaign for the XENON1T experiment. Using gamma-ray spectroscopy and mass spectrometry techniques, systematic measurements of trace radioactive impurities in over one hundred samples within a wide range of materials were performed. The measured activities allowed for stringent selection and placement of materials during the detector construction phase and provided the input for XENON1T detection sensitivity estimates through Monte Carlo simulations.

  • 8. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M.
    Simgen, H.
    von Sivers, M.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Vargas, M.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Search for magnetic inelastic dark matter with XENON1002017In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 10, article id 039Article in journal (Refereed)
    Abstract [en]

    We present the first search for dark matter-induced delayed coincidence signals in a dual-phase xenon time projection chamber, using the 224.6 live days of the XENON100 science run II. This very distinct signature is predicted in the framework of magnetic inelastic dark matter which has been proposed to reconcile the modulation signal reported by the DAMA/LIBRA collaboration with the null results from other direct detection experiments. No candidate event has been found in the region of interest and upper limits on the WIMP's magnetic dipole moment are derived. The scenarios proposed to explain the DAMA/LIBRA modulation signal by magnetic inelastic dark matter interactions of WIMPs with masses of 58.0 GeV/c(2) and 122.7 GeV/c(2) are excluded at 3.3 sigma and 9.3 sigma, respectively.

  • 9. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, B.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M.
    Simgen, H.
    Sivers, M. V.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Search for Electronic Recoil Event Rate Modulation with 4 Years of XENON100 Data2017In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 10, article id 101101Article in journal (Refereed)
    Abstract [en]

    We report on a search for electronic recoil event rate modulation signatures in the XENON100 data accumulated over a period of 4 yr, from January 2010 to January 2014. A profile likelihood method, which incorporates the stability of the XENON100 detector and the known electronic recoil background model, is used to quantify the significance of periodicity in the time distribution of events. There is a weak modulation signature at a period of 431(-14)(+16) day in the low energy region of (2.0-5.8) keV in the single scatter event sample, with a global significance of 1.9 sigma; however, no other more significant modulation is observed. The significance of an annual modulation signature drops from 2.8 sigma, from a previous analysis of a subset of this data, to 1.8 sigma with all data combined. Single scatter events in the low energy region are thus used to exclude the DAMA/LIBRA annual modulation as being due to dark matter electron interactions via axial vector coupling at 5.7 sigma.

  • 10. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Di Galloway, A.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kazama, S.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M.
    Simgen, H.
    Sivers, M. V.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Vargas, M.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Farmer, Benjamin
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Effective field theory search for high-energy nuclear recoils using the XENON100 dark matter detector2017In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 4, article id 042004Article in journal (Refereed)
    Abstract [en]

    We report on weakly interacting massive particles (WIMPs) search results in the XENON100 detector using a nonrelativistic effective field theory approach. The data from science run II (34 kg x 224.6 live days) were reanalyzed, with an increased recoil energy interval compared to previous analyses, ranging from (6.6-240) keV(nr). The data are found to be compatible with the background-only hypothesis. We present 90% confidence level exclusion limits on the coupling constants of WIMP-nucleon effective operators using a binned profile likelihood method. We also consider the case of inelastic WIMP scattering, where incident WIMPs may up-scatter to a higher mass state, and set exclusion limits on this model as well.

  • 11. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kazama, S.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodn
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M.
    Simgen, H.
    Sivers, M. V.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Vargas, M.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Search for WIMP inelastic scattering off xenon nuclei with XENON1002017In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 2, article id 022008Article in journal (Refereed)
    Abstract [en]

    We present the first constraints on the spin-dependent, inelastic scattering cross section of weakly interacting massive particles (WIMPs) on nucleons from XENON100 data with an exposure of 7.64 x 10(3) kg . days. XENON100 is a dual-phase xenon time projection chamber with 62 kg of active mass, operated at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy and designed to search for nuclear recoils from WIMP-nucleus interactions. Here we explore inelastic scattering, where a transition to a low-lying excited nuclear state of Xe-129 is induced. The experimental signature is a nuclear recoil observed together with the prompt deexcitation photon. We see no evidence for such inelastic WIMP-Xe-129 interactions. A profile likelihood analysis allows us to set a 90% C.L. upper limit on the inelastic, spin-dependent WIMP-nucleon cross section of 3.3 x 10(-38) cm(2) at 100 GeV/c(2). This is the most constraining result to date, and sets the pathway for an analysis of this interaction channel in upcoming, larger dual-phase xenon detectors.

  • 12. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Johannes Gutenberg-Universität Mainz, Germany.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buss, A.
    Butikofer, L.
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics.
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Duchovni, E.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. INFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Italy.
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Galloway, M.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Gross, E.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Le Calloch, M.
    Levy, C.
    Linde, F.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Lyashenko, A.
    Manfredini, A.
    Undagoitia, T. Marrodn
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Fernandez, A. J. Melgarejo
    Meng, Y.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Oberlack, U.
    Orrigo, S. E. A.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics.
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Simgen, H.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C. D.
    von Sivers, M.
    Wall, R.
    Wang, H.
    Weber, M.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Zhang, Y.
    Low-mass dark matter search using ionization signals in XENON1002016In: Physical Review D, ISSN 2470-0010, Vol. 94, no 9, article id 092001Article in journal (Refereed)
    Abstract [en]

    We perform a low-mass dark matter search using an exposure of 30 kg x yr with the XENON100 detector. By dropping the requirement of a scintillation signal and using only the ionization signal to determine the interaction energy, we lowered the energy threshold for detection to 0.7 keV for nuclear recoils. No dark matter detection can be claimed because a complete background model cannot be constructed without a primary scintillation signal. Instead, we compute an upper limit on the WIMP-nucleon scattering cross section under the assumption that every event passing our selection criteria could be a signal event. Using an energy interval from 0.7 keV to 9.1 keV, we derive a limit on the spin-independent WIMP-nucleon cross section that excludes WIMPs with a mass of 6 GeV/c(2) above 1.4 x 10(-41) cm(2) at 90% confidence level.

  • 13. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Johannes Gutenberg-Universität Mainz, Germany.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Butikofer, L.
    Calven, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Duchovni, E.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Le Calloch, M.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Meng, Y.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Orrigo, S. E. A.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    Saldanha, R.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    v Sivers, M.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Results from a calibration of XENON100 using a source of dissolved radon-2202017In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 95, no 7, article id 072008Article in journal (Refereed)
    Abstract [en]

    A Rn-220 source is deployed on the XENON100 dark matter detector in order to address the challenges in calibration of tonne-scale liquid noble element detectors. We show that the Pb-212 beta emission can be used for low-energy electronic recoil calibration in searches for dark matter. The isotope spreads throughout the entire active region of the detector, and its activity naturally decays below background level within a week after the source is closed. We find no increase in the activity of the troublesome Rn-222 background after calibration. Alpha emitters are also distributed throughout the detector and facilitate calibration of its response to Rn-222. Using the delayed coincidence of Rn-220-Po-216, we map for the first time the convective motion of particles in the XENON100 detector. Additionally, we make a competitive measurement of the half-life of Po-212, t(1/2) = (293.9 +/- (1.0)(stat) +/- (0.6)(sys)) ns.

  • 14. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Johannes Gutenberg-Universität Mainz, Germany.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Butikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, J.
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Duchovni, E.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Le Calloch, M.
    Levy, C.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Manfredini, A.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Meng, Y.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Orrigo, S. E. A.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M.
    Simgen, H.
    Sivers, M. v.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C. D.
    Wall, R.
    Wang, H.
    Weber, M.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Zhang, Y.
    XENON100 dark matter results from a combination of 477 live days2016In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 94, no 12, article id 122001Article in journal (Refereed)
    Abstract [en]

    We report on WIMP search results of the XENON100 experiment, combining three runs summing up to 477 live days from January 2010 to January 2014. Data from the first two runs were already published. A blind analysis was applied to the last run recorded between April 2013 and January 2014 prior to combining the results. The ultralow electromagnetic background of the experiment, similar to 5 x 10(-3) events/(keV(ee) x kg x day)) before electronic recoil rejection, together with the increased exposure of 48 kg x yr, improves the sensitivity. A profile likelihood analysis using an energy range of (6.6-43.3) keV(nr) sets a limit on the elastic, spin-independent WIMP-nucleon scattering cross section for WIMP masses above 8 GeV/c(2), with a minimum of 1.1 x 10(-45) cm(2) at 50 GeV/c(2) and 90% confidence level. We also report updated constraints on the elastic, spin-dependent WIMP-nucleon cross sections obtained with the same data. We set upper limits on the WIMP-neutron (proton) cross section with a minimum of 2.0 x 10(-40) cm(2) (52 x 10(-40) cm(2)) at a WIMP mass of 50 GeV/c(2), at 90% confidence level.

  • 15. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Johannes Gutenberg-Universität, Germany.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Butikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Duchovni, E.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Le Calloch, M.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Meng, Y.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Orrigo, S. E. A.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Piro, M. -C.
    Pizzella, V.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    Saldanha, R.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    von Sivers, M.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Cristescu, I.
    Online Rn-222 removal by cryogenic distillation in the XENON100 experiment2017In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 6, article id 358Article in journal (Refereed)
    Abstract [en]

    We describe the purification of xenon from traces of the radioactive noble gas radon using a cryogenic distillation column. The distillation column was integrated into the gas purification loop of the XENON100 detector for online radon removal. This enabled us to significantly reduce the constant Rn-222 background originating from radon emanation. After inserting an auxiliary 222Rn emanation source in the gas loop, we determined a radon reduction factor of R > 27 (95% C.L.) for the distillation column by monitoring the Rn-222 activity concentration inside the XENON100 detector.

  • 16. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Johannes Gutenberg-Universität Mainz, Germany.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Butikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    De Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Duchovni, E.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Le Calloch, M.
    Levy, C.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Manfredini, A.
    Undagoitia, T. Marrodan
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Meng, Y.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Orrigo, S. E. A.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Silva, M.
    Simgen, H.
    Sivers, M. V.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C. D.
    Wall, R.
    Wang, H.
    Weber, M.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Zhang, Y.
    Search for two-neutrino double electron capture of Xe-124 with XENON1002017In: Physical Review C, ISSN 2469-9985, Vol. 95, no 2, article id 024605Article in journal (Refereed)
    Abstract [en]

    Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shell. For Xe-124 this process has not yet been observed and its detection would provide a new reference for nuclear matrix element calculations. We have conducted a search for two-neutrino double electron capture from the K shell of 124Xe using 7636 kg d of data from the XENON100 dark matter detector. Using a Bayesian analysis we observed no significant excess above background, leading to a lower 90% credibility limit on the half-life T-1/2 > 6.5 x 10(20) yr. We have also evaluated the sensitivity of the XENON1T experiment, which is currently being commissioned, and found a sensitivity of T-1/2 > 6.1 x 10(22) yr after an exposure of 2 t yr.

  • 17. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Bütikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Duchovni, E.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Franco, D.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Huhmann, C.
    Itay, R.
    Kaminsky, B.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Le Calloch, M.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lopes, J. A. M.
    Manfredini, A.
    Maris, I.
    Undagoitia, T. Marrodán
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Meng, Y.
    Messina, M.
    Micheneau, K.
    Miguez, B.
    Molinario, A.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Orrigo, S. E. A.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Piro, M. -C.
    Pizzella, V.
    Plante, G.
    Priel, N.
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rosendahl, S.
    Rupp, N.
    Saldanha, R.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Sivers, M. V.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Cristescu, I.
    Removing krypton from xenon by cryogenic distillation to the ppq level2017In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 5, article id 275Article in journal (Refereed)
    Abstract [en]

    The XENON1T experiment aims for the direct detection of dark matter in a detector filled with 3.3 tons of liquid xenon. In order to achieve the desired sensitivity, the background induced by radioactive decays inside the detector has to be sufficiently low. One major contributor is the beta-emitter Kr-85 which is present in the xenon. For XENON1T a concentration of natural krypton in xenon Kr-nat/Xe < 200 ppq (parts per quadrillion, 1 ppq = 10(-15) mol/mol) is required. In this work, the design, construction and test of a novel cryogenic distillation column using the common McCabe-Thiele approach is described. The system demonstrated a krypton reduction factor of 6.4 . 10(5) with thermodynamic stability at process speeds above 3 kg/h. The resulting concentration of natKr/Xe < 26 ppq is the lowest ever achieved, almost one order of magnitude below the requirements for XENON1T and even sufficient for future dark matter experiments using liquid xenon, such as XENONnT and DARWIN.

  • 18. Aprile, E.
    et al.
    Aalbers, J.
    Agostini, F.
    Alfonsi, M.
    Amaro, F. D.
    Anthony, M.
    Arneodo, F.
    Barrow, P.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Bütikofer, L.
    Calvén, Jakob
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cardoso, J. M. R.
    Cervantes, M.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Geis, C.
    Goetzke, L. W.
    Grandi, L.
    Greene, Z.
    Grignon, C.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Itay, R.
    Kaminsky, B.
    Kazama, S.
    Kessler, G.
    Kish, A.
    Landsman, H.
    Lang, R. F.
    Lellouch, D.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Maris, I.
    Undagoitia, T. Marrodán
    Masbou, J.
    Massoli, F. V.
    Masson, D.
    Mayani, D.
    Messina, M.
    Micheneau, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Pakarha, P.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Persiani, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Piro, M. -C.
    Plante, G.
    Priel, N.
    Garcia, D. Ramirez
    Rauch, L.
    Reichard, S.
    Reuter, C.
    Rizzo, A.
    Rupp, N.
    Saldanha, R.
    dos Santos, J. M. F.
    Sartorelli, G.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    von Sivers, M.
    Stein, A.
    Thers, D.
    Tiseni, A.
    Trinchero, G.
    Tunnell, C.
    Vargas, M.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Signal yields of keV electronic recoils and their discrimination from nuclear recoils in liquid xenon2018In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 97, no 9, article id 092007Article in journal (Refereed)
    Abstract [en]

    We report on the response of liquid xenon to low energy electronic recoils below 15 keV from beta decays of tritium at drift fields of 92 V/cm, 154 V/cm and 366 V/cm using the XENON100 detector. A data-to-simulation fitting method based on Markov Chain Monte Carlo is used to extract the photon yields and recombination fluctuations from the experimental data. The photon yields measured at the two lower fields are in agreement with those from literature; additional measurements at a higher field of 366 V/cm are presented. The electronic and nuclear recoil discrimination as well as its dependence on the drift field and photon detection efficiency are investigated at these low energies. The results provide new measurements in the energy region of interest for dark matter searches using liquid xenon.

  • 19. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, The Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kaminsky, B.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Plante, G.
    Podviianiuk, R.
    Priel, N.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Observation of two-neutrino double electron capture in Xe-124 with XENON1T2019In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 568, no 7753, p. 532-535Article in journal (Refereed)
    Abstract [en]

    Two-neutrino double electron capture (2 nu ECEC) is a second-order weak-interaction process with a predicted half-life that surpasses the age of the Universe by many orders of magnitude(1). Until now, indications of 2 nu ECEC decays have only been seen for two isotopes(2-5), Kr-78 and Ba-130, and instruments with very low background levels are needed to detect them directly with high statistical significance(6,7). The 2 nu ECEC half-life is an important observable for nuclear structure models(8-14) and its measurement represents a meaningful step in the search for neutrinoless double electron capture-the detection of which would establish the Majorana nature of the neutrino and would give access to the absolute neutrino mass(15-17). Here we report the direct observation of 2 nu ECEC in Xe-124 with the XENON1T dark-matter detector. The significance of the signal is 4.4 standard deviations and the corresponding half-life of 1.8 x 10(22) years (statistical uncertainty, 0.5 x 10(22) years; systematic uncertainty, 0.1 x 10(22) years) is the longest measured directly so far. This study demonstrates that the low background and large target mass of xenon-based dark-matter detectors make them well suited for measuring rare processes and highlights the broad physics reach of larger next-generation experiments(18-20).

  • 20. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherland.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kaminsky, B.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Piastra, F.
    Pienaar, J.
    Pizzella, V.
    Plante, G.
    Podviianiuk, R.
    Priel, N.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Hoferichter, M.
    Klos, P.
    Menendez, J.
    Schwenk, A.
    First Results on the Scalar WIMP-Pion Coupling, Using the XENON1T Experiment2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 7, article id 071301Article in journal (Refereed)
    Abstract [en]

    We present first results on the scalar coupling of weakly interacting massive particles (WIMPs) to pions from 1 t yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged between the nucleons in a nucleus. In contrast to most nonrelativistic operators, these pion-exchange currents can be coherently enhanced by the total number of nucleons and therefore may dominate in scenarios where spin-independent WIMP-nucleon interactions are suppressed. Moreover, for natural values of the couplings, they dominate over the spin-dependent channel due to their coherence in the nucleus. Using the signal model of this new WIMP-pion channel, no significant excess is found, leading to an upper limit cross section of 6.4 x 10(-46) cm(2) (90% confidence level) at 30 GeV/c(2) WIMP mass.

  • 21. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Anthony, M.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussormeau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Gallo Rosso, A.
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazamna, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Prie, N.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Xu, Z.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 14, article id 141301Article in journal (Refereed)
    Abstract [en]

    We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from the XENON1T dark matter search experiment. The analysis uses the full ton year exposure of XENON1T to constrain the spin-dependent proton-only and neutron-only cases. No significant signal excess is observed, and a profile likelihood ratio analysis is used to set exclusion limits on the WIMP-nucleon interactions. This includes the most stringent constraint to date on the WIMP-neutron cross section, with a minimum of 6.3 x 10(-42) cm(2) at 30 GeV/c(2) and 90% confidence level. The results are compared with those from collider searches and used to exclude new parameter space in an isoscalar theory with an axial-vector mediator.

  • 22. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Barge, Derek
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Bellagamba, L.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Buetikofer, L.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Gaemers, P.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazama, S.
    Kish, A.
    Kobayashi, M.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, M. S.
    Riedel, B.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C. D.
    Upole, N.
    Vargas, M.
    Volta, G.
    Wack, O.
    Wang, H.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    Pieracci, M.
    Tintori, C.
    The XENON1T data acquisition system2019In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id P07016Article in journal (Refereed)
    Abstract [en]

    The XENON1T liquid xenon time projection chamber is the most sensitive detector built to date for the measurement of direct interactions of weakly interacting massive particles with normal matter. The data acquisition system (DAQ) is constructed from commercial, open source, and custom components to digitize signals from the detector and store them for later analysis. The system achieves an extremely low signal threshold by triggering each channel independently, achieving a single photoelectron acceptance of (93 +/- 3)%, and deferring the global trigger to a later, software stage. The event identification is based on MongoDB database queries and has over 98% efficiency at recognizing interactions at the analysis threshold in the center of the target. A readout bandwidth over 300 MB/s is reached in calibration modes and is further expandable via parallelization. This DAQ system was successfully used during three years of operation of XENON1T.

  • 23. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Bellagamba, L.
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    XENON1T dark matter data analysis: Signal reconstruction, calibration, and event selection2019In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, no 5, article id 052014Article in journal (Refereed)
    Abstract [en]

    The XENON1T experiment at the Laboratori Nazionali del Gran Sasso is the most sensitive direct detection experiment for dark matter in the form of weakly interacting particles (WIMPs) with masses above 6 GeV/c(2) scattering off nuclei. The detector employs a dual-phase time projection chamber with 2.0 metric tons of liquid xenon in the target. A one metric ton x year exposure of science data was collected between October 2016 and February 2018. This article reports on the performance of the detector during this period and describes details of the data analysis that led to the most stringent exclusion limits on various WIMP-nucleon interaction models to date. In particular, signal reconstruction, event selection, and calibration of the detector response to nuclear and electronic recoils in XENON1T are discussed.

  • 24. Aprile, E.
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherlands.
    Agostini, F.
    Alfonsi, M.
    Althueser, L.
    Amaro, F. D.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Arneodo, F.
    Baudis, L.
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Benabderrahmane, M. L.
    Berger, T.
    Breur, P. A.
    Brown, A.
    Brown, E.
    Bruenner, S.
    Bruno, G.
    Budnik, R.
    Capelli, C.
    Cardoso, J. M. R.
    Cichon, D.
    Coderre, D.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Cussonneau, J. P.
    Decowski, M. P.
    de Perio, P.
    Di Gangi, P.
    Di Giovanni, A.
    Diglio, S.
    Elykov, A.
    Eurin, G.
    Fei, J.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Fieguth, A.
    Fulgione, W.
    Rosso, A. Gallo
    Galloway, M.
    Gao, F.
    Garbini, M.
    Grandi, L.
    Greene, Z.
    Hasterok, C.
    Hogenbirk, E.
    Howlett, J.
    Iacovacci, M.
    Itay, R.
    Joerg, F.
    Kazama, S.
    Kish, A.
    Koltman, G.
    Kopec, A.
    Landsman, H.
    Lang, R. F.
    Levinson, L.
    Lin, Q.
    Lindemann, S.
    Lindner, M.
    Lombardi, F.
    Lopes, J. A. M.
    Fune, E. Lopez
    Macolino, C.
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Manfredini, A.
    Marignetti, F.
    Undagoitia, T. Marrodan
    Masbou, J.
    Masson, D.
    Mastroianni, S.
    Messina, M.
    Micheneau, K.
    Miller, K.
    Molinario, A.
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mosbacher, Y.
    Murra, M.
    Naganoma, J.
    Ni, K.
    Oberlack, U.
    Odgers, K.
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Peres, R.
    Piastra, F.
    Pienaar, J.
    Pizzella, V
    Plante, G.
    Podviianiuk, R.
    Qiu, H.
    Garcia, D. Ramirez
    Reichard, S.
    Riedel, B.
    Rizzo, A.
    Rocchetti, A.
    Rupp, N.
    dos Santos, J. M. F.
    Sartorelli, G.
    Sarcevic, N.
    Scheibelhut, M.
    Schindler, S.
    Schreiner, J.
    Schulte, D.
    Schumann, M.
    Lavina, L. Scotto
    Selvi, M.
    Shagin, P.
    Shockley, E.
    Silva, M.
    Simgen, H.
    Therreau, C.
    Thers, D.
    Toschi, F.
    Trinchero, G.
    Tunnell, C.
    Upole, N.
    Vargas, M.
    Wack, O.
    Wang, H.
    Wang, Z.
    Wei, Y.
    Weinheimer, C.
    Wenz, D.
    Wittweg, C.
    Wulf, J.
    Ye, J.
    Zhang, Y.
    Zhu, T.
    Zopounidis, J. P.
    XENON1T dark matter data analysis: Signal and background models and statistical inference2019In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 11, article id 112009Article in journal (Refereed)
    Abstract [en]

    The XENON1T experiment searches for dark matter particles through their scattering off xenon atoms in a 2 metric ton liquid xenon target. The detector is a dual-phase time projection chamber, which measures simultaneously the scintillation and ionization signals produced by interactions in target volume, to reconstruct energy and position, as well as the type of the interaction. The background rate in the central volume of XENON1T detector is the lowest achieved so far with a liquid xenon-based direct detection experiment. In this work we describe the response model of the detector, the background and signal models, and the statistical inference procedures used in the dark matter searches with a 1 metric ton x year exposure of XENON1T data, that leads to the best limit to date on WIMP-nucleon spin-independent elastic scatter cross section for WIMP masses above 6 GeV/c(2).

  • 25. Aprile, Elena
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Nikhef, Netherlands; University of Amsterdam, Netherlands.
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Ferella, Alfredo Davide
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Schwenk, Achim
    First results on the scalar WIMP-pion coupling, using the XENON1T experimentManuscript (preprint) (Other academic)
    Abstract [en]

    We present first results on the scalar WIMP-pion coupling from 1 t×yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged between the nucleons in a nucleus. In contrast to most non-relativistic operators, these pion-exchange currents can be coherently enhanced by the total number of nucleons, and therefore may dominate in scenarios where spin-independent WIMP-nucleon interactions are suppressed. Moreover, for natural values of the couplings, they dominate over the spin-dependent channel due to their coherence in the nucleus. Using the signal model of this new WIMP-pion channel, no significant excess is found, leading to an upper limit cross section of 6.4×10−46 cm2 (90 % confidence level) at 30 GeV/c2 WIMP mass.

  • 26. Aprile, Elena
    et al.
    Aalbers, Jelle
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Antochi, Vasile Cristian
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Bauermeister, Boris
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Ferella, Alfredo Davide
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Mahlstedt, Jörn
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Morå, Knut
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Pelssers, Bart
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Zopounidis, J. P.
    Analysis of the XENON1T data for WIMP search: Background Models and Statistical InferenceManuscript (preprint) (Other academic)
    Abstract [en]

    The XENON1T experiment searches for dark matter recoils within a $2$ tonne liquid xenon target. The detector is operated as a dual-phase time projection chamber, and reconstructs the energy and position of interactions in the active volume. In the central volume of the target mass, the lowest background rate of a xenon-based direct detection experiment so far has been achieved. In this work we describe the detector response modelling, the background and signal models, and the statistical inference procedures used in a search for Weakly Interacting Massive Particles (WIMPs) using 1\,tonne$\times$year exposure of XENON1T data.

  • 27. Betti, M. G.
    et al.
    Biasotti, M.
    Bosca, A.
    Calle, F.
    Canci, N.
    Cavoto, G.
    Chang, C.
    Cocco, A. G.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    D'Ambrosio, N.
    De Groot, N.
    de Salas, Pablo Fernández
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Faverzani, M.
    Ferella, Alfredo
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Ferri, E.
    Garcia-Abia, P.
    Garcia-Cortes, I
    Garcia Gomez-Tejedor, G.
    Gariazzo, S.
    Gatti, F.
    Gentile, C.
    Giachero, A.
    Gudmundsson, Jón E.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Hochberg, Y.
    Kahn, Y.
    Kievsky, A.
    Lisanti, M.
    Mancini-Terracciano, C.
    Mangano, G.
    Marcucci, L. E.
    Mariani, C.
    Martinez, J.
    Messina, M.
    Molinero-Vela, A.
    Monticone, E.
    Morono, A.
    Nucciotti, A.
    Pandolfi, F.
    Parlati, S.
    Pastor, S.
    Pedros, J.
    de los Heros, C. Perez
    Pisanti, O.
    Polosa, A. D.
    Puiu, A.
    Rago, I
    Raitses, Y.
    Rajteri, M.
    Rossi, N.
    Rucandio, I
    Santorelli, R.
    Schaeffner, K.
    Tully, C. G.
    Viviani, M.
    Zhao, F.
    Zurek, K. M.
    Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case2019In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 7, article id 047Article in journal (Refereed)
    Abstract [en]

    The PTOLEMY project aims to develop a scalable design for a Cosmic Neutrino Background (CNB) detector, the first of its kind and the only one conceived that can look directly at the image of the Universe encoded in neutrino background produced in the first second after the Big Bang. The scope of the work for the next three years is to complete the conceptual design of this detector and to validate with direct measurements that the non-neutrino backgrounds are below the expected cosmological signal. In this paper we discuss in details the theoretical aspects of the experiment and its physics goals. In particular, we mainly address three issues. First we discuss the sensitivity of PTOLEMY to the standard neutrino mass scale. We then study the perspectives of the experiment to detect the CNB via neutrino capture on tritium as a function of the neutrino mass scale and the energy resolution of the apparatus. Finally, we consider an extra sterile neutrino with mass in the eV range, coupled to the active states via oscillations, which has been advocated in view of neutrino oscillation anomalies. This extra state would contribute to the tritium decay spectrum, and its properties, mass and mixing angle, could be studied by analyzing the features in the beta decay electron spectrum.

  • 28. Betti, M. G.
    et al.
    Biasotti, M.
    Boscá, A.
    Calle, F.
    Carabe-Lopez, J.
    Cavoto, G.
    Chang, C.
    Chung, W.
    Cocco, A. G.
    Colijn, A. P.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics.
    D'Ambrosio, N.
    de Salas, Pablo F.
    Stockholm University, Faculty of Science, Department of Physics. Instituto de Física Corpuscular (CSIC-Universitat de València), Spain.
    Faverzani, M.
    Ferella, Alfredo
    Stockholm University, Faculty of Science, Department of Physics.
    Ferri, E.
    Garcia-Abia, P.
    Garcia Gomez-Tejedor, G.
    Gariazzo, S.
    Gatti, F.
    Gentile, C.
    Giachero, A.
    Gudmundsson, Jón E.
    Stockholm University, Faculty of Science, Department of Physics. Luleå University of Technology, Sweden.
    Hochberg, Y.
    Kahn, Y.
    Lisanti, M.
    Mancini-Terracciano, C.
    Mangano, G.
    Marcucci, L. E.
    Mariani, C.
    Martínez, J.
    Messina, M.
    Molinero-Vela, A.
    Monticone, E.
    Nucciotti, A.
    Pandolfi, F.
    Pastor, S.
    Pedrós, J.
    de los Heros, C. Pérez
    Pisanti, O.
    Polosa, A. D.
    Puiu, A.
    Raitses, Y.
    Rajteri, M.
    Rossi, N.
    Santorelli, R.
    Schaeffner, K.
    Strid, C. F.
    Stockholm University, Faculty of Science, Department of Physics. Luleå University of Technology, Sweden.
    Tully, C. G.
    Zhao, F.
    Zurek, K. M.
    A design for an electromagnetic filter for precision energy measurements at the tritium endpoint2019In: Progress in Particle and Nuclear Physics, ISSN 0146-6410, E-ISSN 1873-2224, Vol. 106, p. 120-131Article, review/survey (Refereed)
    Abstract [en]

    We present a detailed description of the electromagnetic filter for the PTOLEMY project to directly detect the Cosmic Neutrino Background (CNB). Starting with an initial estimate for the orbital magnetic moment, the higher-order drift process of E x B is configured to balance the gradient-B drift motion of the electron in such a way as to guide the trajectory into the standing voltage potential along the mid-plane of the filter. As a function of drift distance along the length of the filter, the filter zooms in with exponentially increasing precision on the transverse velocity component of the electron kinetic energy. This yields a linear dimension for the total filter length that is exceptionally compact compared to previous techniques for electromagnetic filtering. The parallel velocity component of the electron kinetic energy oscillates in an electrostatic harmonic trap as the electron drifts along the length of the filter. An analysis of the phase-space volume conservation validates the expected behavior of the filter from the adiabatic invariance of the orbital magnetic moment and energy conservation following Liouville's theorem for Hamiltonian systems.

  • 29. Catena, Riccardo
    et al.
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Döring, Christian
    Ferella, Alfredo Davide
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Krauss, Martin B.
    Dark matter spin determination with directional direct detection experiments2018In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 97, no 2, article id 023007Article in journal (Refereed)
    Abstract [en]

    If dark matter has spin 0, only two WIMP-nucleon interaction operators can arise as leading operators from the nonrelativistic reduction of renormalizable single-mediator models for dark matter-quark interactions. Based on this crucial observation, we show that about 100 signal events at next generation directional detection experiments can be enough to enable a 2 sigma rejection of the spin 0 dark matter hypothesis in favor of alternative hypotheses where the dark matter particle has spin 1/2 or 1. In this context, directional sensitivity is crucial since anisotropy patterns in the sphere of nuclear recoil directions depend on the spin of the dark matter particle. For comparison, about 100 signal events are expected in a CF4\ detector operating at a pressure of 30 torr with an exposure of approximately 26,000 cubic-meter-detector days for WIMPs of 100 GeV mass and a WIMP-fluorine scattering cross section of 0.25 pb. Comparable exposures require an array of cubic meter time projection chamber detectors.

  • 30. Creus, W.
    et al.
    Allkofer, Y.
    Amsler, C.
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics.
    Rochet, J.
    Scotto-Lavina, L.
    Walter, M.
    Scintillation efficiency of liquid argon in low energy neutron-argon scattering2015In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 10, article id P08002Article in journal (Refereed)
    Abstract [en]

    Experiments searching for weak interacting massive particles with noble gases such as liquid argon require very low detection thresholds for nuclear recoils. A determination of the scintillation efficiency is crucial to quantify the response of the detector at low energy. We report the results obtained with a small liquid argon cell using a monoenergetic neutron beam produced by a deuterium-deuterium fusion source. The light yield relative to electrons was measured for six argon recoil energies between 11 and 120 keV at zero electric drift field.

  • 31.
    Geilhufe, R. Matthias
    et al.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Olsthoorn, Bart
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Ferella, Alfredo D.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Koski, Timo
    Kahlhoefer, Felix
    Conrad, Jan
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
    Balatsky, Alexander V.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Connecticut, USA; Los Alamos National Laboratory, USA.
    Materials Informatics for Dark Matter Detection2018In: Physica Status Solidi. Rapid Research Letters, ISSN 1862-6254, E-ISSN 1862-6270, Vol. 12, no 11, article id 1800293Article in journal (Refereed)
    Abstract [en]

    Dark Matter particles are commonly assumed to be weakly interacting massive particles (WIMPs) with a mass in the GeV to TeV range. However, recent interest has shifted toward lighter WIMPs, which are more difficult to probe experimentally. A detection of sub-GeV WIMPs will require the use of small gap materials in sensors. Using recent estimates of the WIMP mass, we identify the relevant target space toward small gap materials (100 to 10 meV). Dirac Materials, a class of small- or zero-gap materials, emerge as natural candidates for sensors for Dark Matter detection. We propose the use of informatics tools to rapidly assay materials band structures to search for small gap semiconductors and semimetals, rather than focusing on a few preselected compounds. As a specific example of the proposed strategy, we use the organic materials database () to identify organic candidates for sensors: the narrow band gap semiconductors BNQ-TTF and DEBTTT with gaps of 40 and 38 meV, and the Dirac-line semimetal (BEDT-TTF)center dot Br which exhibits a tiny gap of approximate to 50 meV when spin-orbit coupling is included. We outline a novel and powerful approach to search for dark matter detection sensor materials by means of a rapid assay of materials using informatics tools.

1 - 31 of 31
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