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Narrow structure in the excitation function of η photoproduction off the neutron.
Werthmüller, D; Witthauer, L; Keshelashvili, I; Aguar-Bartolomé, P; Ahrens, J; Annand, J R M; Arends, H J; Bantawa, K; Beck, R; Bekrenev, V; Braghieri, A; Branford, D; Briscoe, W J; Brudvik, J; Cherepnya, S; Demissie, B; Dieterle, M; Downie, E J; Drexler, P; Fil'kov, L V; Fix, A; Glazier, D I; Hamilton, D; Heid, E; Hornidge, D; Howdle, D; Huber, G M; Jaegle, I; Jahn, O; Jude, T C; Käser, A; Kashevarov, V L; Kondratiev, R; Korolija, M; Kruglov, S P; Krusche, B; Kulbardis, A; Lisin, V; Livingston, K; MacGregor, I J D; Maghrbi, Y; Mancell, J; Manley, D M; Marinides, Z; Martinez, M; McGeorge, J C; McNicoll, E F; Metag, V; Middleton, D G; Mushkarenkov, A.
Afiliação
  • Werthmüller D; Departement für Physik, Universität Basel, Switzerland.
  • Witthauer L; Departement für Physik, Universität Basel, Switzerland.
  • Keshelashvili I; Departement für Physik, Universität Basel, Switzerland.
  • Aguar-Bartolomé P; Institut für Kernphysik, Universität Mainz, Germany.
  • Ahrens J; Institut für Kernphysik, Universität Mainz, Germany.
  • Annand JR; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Arends HJ; Institut für Kernphysik, Universität Mainz, Germany.
  • Bantawa K; Kent State University, Kent, Ohio, USA.
  • Beck R; Institut für Kernphysik, Universität Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany.
  • Bekrenev V; Petersburg Nuclear Physics Institute, Gatchina, Russia.
  • Braghieri A; INFN Sezione di Pavia, Pavia, Italy.
  • Branford D; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Briscoe WJ; Institute for Nuclear Studies, The George Washington University, Washington, District of Columbia, USA.
  • Brudvik J; University of California at Los Angeles, Los Angeles, California, USA.
  • Cherepnya S; Lebedev Physical Institute, Moscow, Russia.
  • Demissie B; Institute for Nuclear Studies, The George Washington University, Washington, District of Columbia, USA.
  • Dieterle M; Departement für Physik, Universität Basel, Switzerland.
  • Downie EJ; Institut für Kernphysik, Universität Mainz, Germany and SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom and Institute for Nuclear Studies, The George Washington University, Washington, District of Columbia, USA.
  • Drexler P; II. Physikalisches Institut, Universität Giessen, Germany.
  • Fil'kov LV; Lebedev Physical Institute, Moscow, Russia.
  • Fix A; Laboratory of Mathematical Physics, Tomsk Polytechnic University, Tomsk, Russia.
  • Glazier DI; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Hamilton D; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Heid E; Institut für Kernphysik, Universität Mainz, Germany.
  • Hornidge D; Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
  • Howdle D; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Huber GM; University of Regina, Regina, SK S4S 0A2, Canada.
  • Jaegle I; Departement für Physik, Universität Basel, Switzerland.
  • Jahn O; Institut für Kernphysik, Universität Mainz, Germany.
  • Jude TC; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Käser A; Departement für Physik, Universität Basel, Switzerland.
  • Kashevarov VL; Institut für Kernphysik, Universität Mainz, Germany and Lebedev Physical Institute, Moscow, Russia.
  • Kondratiev R; Institute for Nuclear Research, Moscow, Russia.
  • Korolija M; Rudjer Boskovic Institute, Zagreb, Croatia.
  • Kruglov SP; Petersburg Nuclear Physics Institute, Gatchina, Russia.
  • Krusche B; Departement für Physik, Universität Basel, Switzerland.
  • Kulbardis A; Petersburg Nuclear Physics Institute, Gatchina, Russia.
  • Lisin V; Institute for Nuclear Research, Moscow, Russia.
  • Livingston K; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • MacGregor IJ; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Maghrbi Y; Departement für Physik, Universität Basel, Switzerland.
  • Mancell J; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Manley DM; Kent State University, Kent, Ohio, USA.
  • Marinides Z; Institute for Nuclear Studies, The George Washington University, Washington, District of Columbia, USA.
  • Martinez M; Institut für Kernphysik, Universität Mainz, Germany.
  • McGeorge JC; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • McNicoll EF; SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Metag V; II. Physikalisches Institut, Universität Giessen, Germany.
  • Middleton DG; Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
  • Mushkarenkov A; INFN Sezione di Pavia, Pavia, Italy.
Phys Rev Lett ; 111(23): 232001, 2013 Dec 06.
Article em En | MEDLINE | ID: mdl-24476257
ABSTRACT
The photoproduction of η mesons off nucleons bound in 2H and 3He has been measured in coincidence with recoil protons and recoil neutrons for incident photon energies from threshold up to 1.4 GeV. The experiments were performed at the Mainz MAMI accelerator, using the Glasgow tagged photon facility. Decay photons from the η→2γ and η→3π0 decays and the recoil nucleons were detected with an almost 4π electromagnetic calorimeter combining the Crystal Ball and TAPS detectors. The data from both targets are of excellent statistical quality and show a narrow structure in the excitation function of γn→nη. The results from the two measurements are consistent, taking into account the expected effects from nuclear Fermi motion. The best estimates for position and intrinsic width of the structure are W=(1670±5) MeV and Γ=(30±15) MeV. For the first time precise results for the angular dependence of this structure have been extracted.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Suíça
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Suíça