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Neutron skin of (208)pb from coherent pion photoproduction.
Tarbert, C M; Watts, D P; Glazier, D I; Aguar, P; Ahrens, J; Annand, J R M; Arends, H J; Beck, R; Bekrenev, V; Boillat, B; Braghieri, A; Branford, D; Briscoe, W J; Brudvik, J; Cherepnya, S; Codling, R; Downie, E J; Foehl, K; Grabmayr, P; Gregor, R; Heid, E; Hornidge, D; Jahn, O; Kashevarov, V L; Knezevic, A; Kondratiev, R; Korolija, M; Kotulla, M; Krambrich, D; Krusche, B; Lang, M; Lisin, V; Livingston, K; Lugert, S; MacGregor, I J D; Manley, D M; Martinez, M; McGeorge, J C; Mekterovic, D; Metag, V; Nefkens, B M K; Nikolaev, A; Novotny, R; Owens, R O; Pedroni, P; Polonski, A; Prakhov, S N; Price, J W; Rosner, G; Rost, M.
Afiliação
  • Tarbert CM; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Watts DP; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Glazier DI; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Aguar P; Institut für Kernphysik, University of Mainz, Germany.
  • Ahrens J; Institut für Kernphysik, University of Mainz, Germany.
  • Annand JR; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Arends HJ; Institut für Kernphysik, University of Mainz, Germany.
  • Beck R; Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, Germany.
  • Bekrenev V; Petersburg Nuclear Physics Institute, Gatchina, Russia.
  • Boillat B; Institut für Physik, University of Basel, Basel, Switzerland.
  • Braghieri A; INFN Sezione di Pavia, Pavia, Italy.
  • Branford D; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Briscoe WJ; Center for Nuclear Studies, The George Washington University, Washington, D.C. 20052, USA.
  • Brudvik J; University of California at Los Angeles, Los Angeles, California 90095, USA.
  • Cherepnya S; Lebedev Physical Institute, Moscow, Russia.
  • Codling R; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Downie EJ; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Foehl K; SUPA, School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
  • Grabmayr P; Physikalisches Institut Universität Tübingen, Tübingen, Germany.
  • Gregor R; II. Physikalisches Institut, University of Giessen, Germany.
  • Heid E; Institut für Kernphysik, University of Mainz, Germany.
  • Hornidge D; Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
  • Jahn O; Institut für Kernphysik, University of Mainz, Germany.
  • Kashevarov VL; Lebedev Physical Institute, Moscow, Russia.
  • Knezevic A; Rudjer Boskovic Institute, Zagreb, Croatia.
  • Kondratiev R; Institute for Nuclear Research, Moscow, Russia.
  • Korolija M; Rudjer Boskovic Institute, Zagreb, Croatia.
  • Kotulla M; Institut für Physik, University of Basel, Basel, Switzerland.
  • Krambrich D; Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, Germany.
  • Krusche B; Institut für Physik, University of Basel, Basel, Switzerland.
  • Lang M; Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, Germany.
  • Lisin V; Institute for Nuclear Research, Moscow, Russia.
  • Livingston K; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Lugert S; II. Physikalisches Institut, University of Giessen, Germany.
  • MacGregor IJ; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Manley DM; Kent State University, Kent, Ohio 44240, USA.
  • Martinez M; Institut für Kernphysik, University of Mainz, Germany.
  • McGeorge JC; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Mekterovic D; Rudjer Boskovic Institute, Zagreb, Croatia.
  • Metag V; II. Physikalisches Institut, University of Giessen, Germany.
  • Nefkens BM; University of California at Los Angeles, Los Angeles, California 90095, USA.
  • Nikolaev A; Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, Germany.
  • Novotny R; II. Physikalisches Institut, University of Giessen, Germany.
  • Owens RO; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Pedroni P; INFN Sezione di Pavia, Pavia, Italy.
  • Polonski A; Institute for Nuclear Research, Moscow, Russia.
  • Prakhov SN; University of California at Los Angeles, Los Angeles, California 90095, USA.
  • Price JW; University of California at Los Angeles, Los Angeles, California 90095, USA.
  • Rosner G; SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
  • Rost M; Institut für Kernphysik, University of Mainz, Germany.
Phys Rev Lett ; 112(24): 242502, 2014 Jun 20.
Article em En | MEDLINE | ID: mdl-24996085
ABSTRACT
Information on the size and shape of the neutron skin on (208)Pb is extracted from coherent pion photoproduction cross sections measured using the Crystal Ball detector together with the Glasgow tagger at the MAMI electron beam facility. On exploitation of an interpolated fit of a theoretical model to the measured cross sections, the half-height radius and diffuseness of the neutron distribution are found to be c(n)=6.70±0.03(stat.) fm and a(n)=0.55±0.01(stat.)(-0.03)(+0.02)(sys.) fm, respectively, corresponding to a neutron skin thickness Δr(np)=0.15±0.03(stat.)(-0.03)(+0.01)(sys.) fm. The results give the first successful extraction of a neutron skin thickness with an electromagnetic probe and indicate that the skin of (208)Pb has a halo character. The measurement provides valuable new constraints on both the structure of nuclei and the equation of state for neutron-rich matter.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Reino Unido
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Reino Unido