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  • 1. 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.

  • 2. 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.

  • 3.
    de Salas, Pablo Fernández
    et al.
    Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Institut de Física Corpuscular (CSIC–Universitat de València), Spain.
    Pastor, S.
    Ternes, C. A.
    Thakore, T.
    Tórtola, M.
    Constraining the invisible neutrino decay with KM3NeT-ORCA2019In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 789, p. 472-479Article in journal (Refereed)
    Abstract [en]

    Several theories of particle physics beyond the Standard Model consider that neutrinos can decay. In this work we assume that the standard mechanism of neutrino oscillations is altered by the decay of the heaviest neutrino mass state into a sterile neutrino and, depending on the model, a scalar or a Majoron. We study the sensitivity of the forthcoming KM3NeT-ORCA experiment to this scenario and find that it could improve the current bounds coming from oscillation experiments, where three-neutrino oscillations have been considered, by roughly two orders of magnitude. We also study how the presence of this neutrino decay can affect the determination of the atmospheric oscillation parameters sin(2) theta(23) and Delta m(31)(2), as well as the sensitivity to the neutrino mass ordering.

  • 4. Gariazzo, S.
    et al.
    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).
    Pastor, S.
    Thermalisation of sterile neutrinos in the early universe in the 3+1 scheme with full mixing matrix2019In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 7, article id 014Article in journal (Refereed)
    Abstract [en]

    In the framework of a 3+1 scheme with an additional inert state, we consider the thermalisation of sterile neutrinos in the early Universe taking into account the full 4 x 4 mixing matrix. The evolution of the neutrino energy distributions is found solving the momentum-dependent kinetic equations with full diagonal collision terms, as in previous analyses of flavour neutrino decoupling in the standard case. The degree of thermalisation of the sterile state is shown in terms of the effective number of neutrinos, N-eff, and its dependence on the three additional mixing angles (theta(14), theta(24), theta(34)) and on the squared mass difference Delta m(41)(2) is discussed. Our results are relevant for fixing the contribution of a fourth light neutrino species to the cosmological energy density, whose value is very well constrained by the final Planck analysis. For the preferred region of active-sterile mixing parameters from short-baseline neutrino experiments, we find that the fourth state is fully thermalised (N-eff similar or equal to 4).

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