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  • 1.
    Bargholtz, Christoph
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Gerén, Linda
    Stockholm University, Faculty of Science, Department of Physics.
    Lindberg, Karl
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Thörngren-Engblom, Pia
    Stockholm University, Faculty of Science, Department of Physics.
    Zartova, Irina
    Stockholm University, Faculty of Science, Department of Physics.
     Exclusive measurtement of two-pion production in the dd->4Heππ reaction2009In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 825, no 1-2, p. 71-90Article in journal (Refereed)
    Abstract [en]

    The results from the first kinematically complete measurement of the reaction are reported. The aim was to investigate a long standing puzzle regarding the origin of the peculiar ππ-invariant mass distributions appearing in double pion production in light ion collisions, the so-called ABC effect. The measurements were performed at the incident deuteron energies of 712 MeV and 1029 MeV, with the WASA detector assembly at CELSIUS in Uppsala, Sweden. We report the observation of a characteristic enhancement at low ππ-invariant mass at 712 MeV, the lowest energy yet. At the higher energy, in addition to confirming previous experimental observations, our results reveal a strong angular dependence of the pions in the overall centre of mass system. The results are qualitatively reproduced by a theoretical model, according to which the ABC effect is described as resulting from a kinematical enhancement in the production of the pion pairs from two parallel and independent NNdπ sub-processes.

  • 2.
    Bargholtz, Christoph
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Gerén, Linda
    Stockholm University, Faculty of Science, Department of Physics.
    Lindberg, Karl
    Stockholm University, Faculty of Science, Department of Physics.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Thörngren-Engblom, Pia
    Stockholm University, Faculty of Science, Department of Physics.
    Zartova, Irina
    Stockholm University, Faculty of Science, Department of Physics.
     Production of the ω meson in the pd -> 3He ω reaction at 1450 MeV and 1360 MeV2009In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, ISSN ISSN 0556-2813, Vol. 79, no 4, p. 044002-Article in journal (Refereed)
    Abstract [en]

    The production of ω mesons in the pd→3Heω reaction has been studied at two energies near the kinematic threshold, Tp=1450 MeV and Tp=1360 MeV. The differential cross section was measured as a function of the ω c.m. angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections

  • 3.
    Oellers, D.
    et al.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Barion, L.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Barsov, S.
    St. Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia.
    Bechstedt, U.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Benati, P.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Bertelli, S.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Chiladze, D.
    High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia.
    Ciullo, G.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Contalbrigo, M.
    INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
    Dalpiaz, P.F.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Dietrich, J.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Dolfus, N.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Dymov, S.
    Physikalisches Institut II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
    Engels, R.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Erven, W.
    Jülich Center for Hadron Physics, 52425 Jülich, Germany.
    Garishvili, A.
    High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia.
    Gebel, R.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Goslawski, P.
    Institut für Kernphysik, Universität Münster, 48149 Münster, Germany.
    Grigoryev, K.
    St. Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia.
    Hadamek, H.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Kacharava, A.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Khoukaz, A.
    Institut für Kernphysik, Universität Münster, 48149 Münster, Germany.
    Kulikov, A.
    Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
    Langenberg, G.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Lehrach, A.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Lenisa, P.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Lomidze, N.
    High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia.
    Lorentz, B
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Macharashvili, G.
    Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
    Maier, R.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Martin, S.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Merzliakov, S.
    Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
    Meshkov, I.N.
    Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
    Meyer, H.O.
    Physics Department, Indiana University, Bloomington, IN 47405, USA.
    Mielke, M.
    Institut für Kernphysik, Universität Münster, 48149 Münster, Germany.
    Mikirtychiants, M.
    St. Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia.
    Mikirtychiants, S.
    St. Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia.
    Nass, A.
    Physikalisches Institut II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
    Nekipelov, M.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Nikolaev, N.N.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Nioradze, M.
    High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia.
    d'Orsaneo, G.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Papenbrockj, M.
    Institut für Kernphysik, Universität Münster, 48149 Münster, Germany.
    Prasuhn, D.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Rathmann, F.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Sarkadi, J.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    R. Schleichert, R.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Smirnov, A.
    Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
    Seyfarth, H.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Sowinski, J.
    Physics Department, Indiana University, Bloomington, IN 47405, USA.
    Spoelgen, D.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Stancari, G.
    INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
    Stancari, M.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Statera, M.
    Università di Ferrara and INFN, 44100 Ferrara, Italy.
    Steffens, E.
    Physikalisches Institut II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
    Stein, H.J.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Stockhorst, H.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Straatmann, H.
    Zentralabteilung Technologie, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Ströher, H.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Tabidze, M.
    High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia.
    Tagliente, G.
    INFN, Sezione di Bari, 70126 Bari, Italy.
    Thörngren Engblom, Pia
    Stockholm University, Faculty of Science, Department of Physics.
    Trusov, S.
    Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, 01314 Dresden, Germany.
    Vasilyev, A.
    St. Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia.
    Weidemann, Chr.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Welsch, D.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Wieder, P.
    Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Wüstner, P.
    Zentralinstitut für Elektronik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
    Zupranski, P.
    Department of Nuclear Reactions, Andrzej Soltan, Institute for Nuclear Studies, 00-681 Warsaw, Poland.
    Polarizing a stored proton beam by spin flip?2009In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 674, no 4-5, p. 269-275Article in journal (Refereed)
    Abstract [en]

    We discuss polarizing a proton beam in a storage ring, either by selective removal or by spin flip of the stored ions. Prompted by recent, conflicting calculations, we have carried out a measurement of the spin-flip cross section in low-energy electron–proton scattering. The experiment uses the cooling electron beam at COSY as an electron target. The measured cross sections are too small for making spin flip a viable tool in polarizing a stored beam. This invalidates a recent proposal to use co-moving polarized positrons to polarize a stored antiproton beam.

  • 4. Petren, H.
    et al.
    Bargholtz, Christoph
    Stockholm University, Faculty of Science, Department of Physics.
    Bashkanov, M.
    Bogoslavsky, D.
    Calen, H.
    Clement, H.
    Demiroers, L.
    Ekstrom, C.
    Fransson, K.
    Faldt, G.
    Gerén, Linda
    Stockholm University, Faculty of Science, Department of Physics.
    Hoistad, B.
    Ivanov, G.
    Jacewicz, M.
    Jiganov, E.
    Johansson, T.
    Keleta, S.
    Khakimova, O.
    Koch, I.
    Kren, F.
    Kullander, S.
    Kupsc, A.
    Lindberg, Karl
    Stockholm University, Faculty of Science, Department of Physics.
    Marciniewski, P.
    Morosov, B.
    Pauly, C.
    Petukhov, Y.
    Povtorejko, A.
    Schonning, K.
    Scobel, W.
    Skorodko, T.
    Stepaniak, J.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Engblom, Pia Thörngren
    Stockholm University, Faculty of Science, Department of Physics.
    Tikhomirov, V.
    Wilkin, C.
    Wolke, M.
    Zabierowski, J.
    Zartova, Irina
    Stockholm University, Faculty of Science, Department of Physics.
    Zlomanczuk, J.
    eta-meson production in proton-proton collisions at excess energies of 40 and 72 MeV2010In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 82, no 5, p. 55206-Article in journal (Refereed)
    Abstract [en]

    The production of eta mesons in proton-proton collisions has been studied using the WASA detector at the CELSIUS storage ring at excess energies of Q = 40 MeV and Q = 72 MeV. The eta was detected through its 2 gamma decay in a near-4 pi electromagnetic calorimeter, whereas the protons were measured by a combination of straw chambers and plastic scintillator planes in the forward hemisphere. About 6.9 x 10(4) and 9.3 x 10(4) events were found at Q = 40 MeV and Q = 72 MeV, respectively, with background contributions of less than 5%. A simple parametrization of the production cross section in terms of low partial waves was used to evaluate the acceptance corrections. Strong evidence was found for the influence of higher partial waves. The Dalitz plots show the presence of p waves in both the pp and the eta {pp} systems and the angular distributions of the eta in the center-of-mass frame suggest the influence of d-wave eta mesons.

  • 5. Schonning, K.
    et al.
    Bargholtz, Christoph
    Stockholm University, Faculty of Science, Department of Physics.
    Bashkanov, M.
    Berlowski, M.
    Bogoslawsky, D.
    Calen, H.
    Clement, H.
    Demiroers, L.
    Ekstrom, C.
    Fransson, K.
    Gerén, Linda
    Stockholm University, Faculty of Science, Department of Physics.
    Gustafsson, L.
    Hoistad, B.
    Ivanov, G.
    Jacewicz, M.
    Jiganov, E.
    Johansson, T.
    Keleta, S.
    Khakimova, O.
    Kren, F.
    Kullander, S.
    Kupsc, A.
    Kuzmin, A.
    Lindberg, Karl
    Stockholm University, Faculty of Science, Department of Physics.
    Marciniewski, P.
    Morosov, B.
    Oelert, W.
    Pauly, C.
    Petren, H.
    Petukhov, Y.
    Povtorejko, A.
    Scobel, W.
    Shafigullin, R.
    Shwartz, B.
    Skorodko, T.
    Sopov, V.
    Stepaniak, J.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Engblom, Pia Thörngren
    Stockholm University, Faculty of Science, Department of Physics.
    Tikhomirov, V.
    Turowiecki, A.
    Wagner, G. J.
    Wilkin, C.
    Wolke, M.
    Zabierowski, J.
    Zartova, Irina
    Stockholm University, Faculty of Science, Department of Physics.
    Zlomanczuk, J.
    The pd -> He-3 eta pi(0) reaction at T-p=1450 MeV CELSIUS/WASA Collaboration2010In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 685, no 1, p. 33-37Article in journal (Refereed)
    Abstract [en]

    The cross section for the pd -> He-3 eta pi(0) reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring. The He-3 was detected in coincidence with four photons from the decays of the two mesons. The data indicate that the production mechanism involves the formation of the Delta(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant mass distributions Of all three pairs of final particles are well reproduced by a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the pi(0) momentum in the He-3 pi(0) system.

  • 6. Schonning, K.
    et al.
    Bargholtz, Christoph
    Stockholm University, Faculty of Science, Department of Physics.
    Bashkanov, M.
    Berlowski, M.
    Bogoslawsky, D.
    Calen, H.
    Clement, H.
    Demiroers, L.
    Ekstrom, C.
    Fransson, K.
    Gerén, Linda
    Stockholm University, Faculty of Science, Department of Physics.
    Gustafsson, L.
    Hoistad, B.
    Ivanov, G.
    Jacewicz, M.
    Jiganov, E.
    Johansson, T.
    Keleta, S.
    Khakimova, O.
    Kren, F.
    Kullander, S.
    Kupsc, A.
    Kuzmin, A.
    Lindberg, Karl
    Stockholm University, Faculty of Science, Department of Physics.
    Marciniewski, P.
    Morosov, B.
    Oelert, W.
    Pauly, C.
    Petren, H.
    Petukhov, Y.
    Povtorejko, A.
    Scobel, W.
    Shafigullin, R.
    Shwartz, B.
    Skorodko, T.
    Sopov, V.
    Stepaniak, J.
    Tegnér, Per-Erik
    Stockholm University, Faculty of Science, Department of Physics.
    Engblom, Pia Thörngren
    Stockholm University, Faculty of Science, Department of Physics.
    Tikhomirov, V.
    Turowiecki, A.
    Wagner, G. J.
    Wolke, M.
    Zabierowski, J.
    Zartova, Irina
    Stockholm University, Faculty of Science, Department of Physics.
    Zlomanczuk, J.
    Production of eta and 3 pi mesons in the pd -> (HeX)-He-3 reaction at 1360 and 1450 MeV2010In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 45, no 1, p. 11-21Article in journal (Refereed)
    Abstract [en]

    The cross-sections of the pd -> He-3 eta, pd -> He-3 pi(0)pi(0)pi(0) and pd -> He-3 pi(+)pi(-)pi(0) reactions have been measured at the beam kinetic energies T-p = 1360 MeV and T-p = 1450 MeV using the CELSIUS/WASA detector setup. At both energies, the differential cross-section d sigma/d Omega of the eta meson in the pd -> He-3 eta reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd -> He-3 pi(+)pi(-)pi(0) and pd -> He-3 pi(0)pi(0)pi(0) cross-sections has been analysed in terms of isospin amplitudes. The reconstructed invariant-mass distributions of the pi pi, He-3 pi and (3)He2 pi systems provide hints on the role of nucleon resonances in the 3 pi production process.

  • 7. Skorodko, T.
    et al.
    Bashkanov, M.
    Bogoslawsky, D.
    Calen, H.
    Clement, H.
    Doroshkevich, E.
    Demiroers, L.
    Ekstrom, C.
    Fransson, K.
    Gustafsson, L.
    Hoistad, B.
    Ivanov, G.
    Jacewicz, M.
    Jiganov, E.
    Johansson, T.
    Khakimova, O.
    Keleta, S.
    Koch, I.
    Kren, F.
    Kullander, S.
    Kupsc, A.
    Marciniewski, P.
    Meier, R.
    Morosov, B.
    Pauly, C.
    Petren, H.
    Petukhov, Y.
    Povtorejko, A.
    Ruber, R. J. M. Y.
    Schonning, K.
    Scobel, W.
    Shwartz, B.
    Stepaniak, J.
    Thörngren Engblom, Pia
    Stockholm University, Faculty of Science, Department of Physics.
    Tikhomirov, V.
    Wagner, G. J.
    Wolke, M.
    Yamamoto, A.
    Zabierowski, J.
    Zlomanczuk, J.
    Delta Delta excitation in proton-proton induced pi(0)pi(0) production2011In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 695, no 1-4, p. 115-123Article in journal (Refereed)
    Abstract [en]

    Exclusive measurements of the pp -> pp pi(0)pi(0) reaction have been performed at CELSIUS/WASA at energies from threshold up to T(p) = 1.3 GeV. Total and differential cross sections have been obtained. Here we concentrate on energies T(p) >= GeV. where the Delta Delta excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional t-channel Delta Delta excitation. This holds also for the double-pionic fusion to the quasibound (2)He. The data are compared to model predictions, which are based on both pi- and rho-exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the rho-exchange. A phenomenological modification allowing only a small rho-exchange contribution leads to a quantitative description of the data.

  • 8. Skorodko, T.
    et al.
    Bashkanov, M.
    Bogoslowsky, D.
    Calen, H.
    Clement, H.
    Doroshkevich, E.
    Ekstrom, C.
    Fransson, K.
    Gustafsson, L.
    Hoistad, B.
    Ivanov, G.
    Jacewicz, M.
    Jiganov, E.
    Johansson, T.
    Keleta, S.
    Khakimova, O.
    Koch, I.
    Kren, F.
    Kullander, S.
    Kupsc, A.
    Kuznetsov, A.
    Marciniewski, P.
    Meier, R.
    Morosov, B.
    Pauly, C.
    Petterson, H.
    Petukhov, Y.
    Povtorejko, A.
    Pricking, A.
    Ruber, R. J. M. Y.
    Schonning, K.
    Scobel, W.
    Shwartz, B.
    Sopov, V.
    Stepaniak, J.
    Thörngren Engblom, Pia
    Stockholm University, Faculty of Science, Department of Physics.
    Tikhomirov, V.
    Turowiecki, A.
    Wagner, G. J.
    Wolke, M.
    Yamamoto, A.
    Zabierowski, J.
    Zlomanczuk, J.
    THE pp -> pp pi(0)pi(0) REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND (2)He, IN SEARCH OF THE ABC EFFECT2011In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 26, no 3-4, p. 702-704Article in journal (Refereed)
    Abstract [en]

    The pi(0)pi(0) production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to T(p) = 1.4 GeV. For incident energies T(p) > 1 GeV, i.e. in the region beyond the Roper excitation, the Delta Delta excitation process takes over. The data are well explained by the t-channel Delta Delta process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the pi(0)pi(0)-invariant mass distribution beyond that given by the conventional t-channel Delta Delta process. This is also true for the limiting case, where the protons are in the quasi-bound (2)He state.

  • 9.
    Tegnér, Per-Erik
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Thörngren-Engblom, Pia
    Stockholm University, Faculty of Science, Department of Physics.
     The pp -> d pi(+)pi(0) reaction – a case of Delta Delta excitation without ABC effect2009In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 24, no 2-3, p. 561-563Article in journal (Refereed)
    Abstract [en]

    The ABC effect, a low-mass enhancement in the invariant ππ mass, is observed in double-pionic fusion reactions leading to a bound nuclear system in the final state. From previous measurements there have been indications that this phenomenon is resctricted to the σ channel of the ππ system. With exclusive measurements of the pp → dπ<sup>+</sup>π<sup>0</sup> reaction at T<sub>p</sub> = 1.1 GeV we demonstrate that, indeed, the ABC effect does not occur in the vector-isovector ππ channel (ρ channel) despite the fact that the ΔΔ excitation is oberved to be the dominant reaction process. We also show that this reaction is well described by a t-channel ΔΔ excitation with the subsequent decay into the vector-isovector ππ channel given by the ρ channel operator

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  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf