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arxiv 1311.0168 v3 pith:2K53UMZQ submitted 2013-11-01 nucl-ex nucl-th

Neutron skin of ²⁰⁸Pb from Coherent Pion Photoproduction

C.M. Tarbert , D.P. Watts , D.I. Glazier , P. Aguar , J. Ahrens , J.R.M. Annand , H.J. Arends , R. Beck
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V. Bekrenev B. Boillat A. Braghieri D. Branford W.J. Briscoe J. Brudvik S. Cherepnya R. Codling E.J. Downie K. Foehl P. Grabmayr R. Gregor E. Heid D. Hornidge O. Jahn V.L. Kashevarov A. Knezevic R. Kondratiev M. Korolija M. Kotulla D. Krambrich B. Krusche M. Lang V. Lisin K. Livingston S. Lugert I.J.D. MacGregor D.M. Manley M. Martinez J.C. McGeorge D. Mekterovic V. Metag B.M.K. Nefkens A. Nikolaev R. Novotny R.O. Owens P. Pedroni A. Polonski S.N. Prakhov J.W. Price G. Rosner M. Rost T. Rostomyan S. Schadmand S. Schumann D. Sober A. Starostin I. Supek A. Thomas M. Unverzagt Th. Walcher F. Zehr
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Information on the size and shape of the neutron skin on $^{208}$Pb has been extracted from coherent pion photoproduction cross sections measured using the Crystal Ball 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 6.70$\pm 0.03(stat)$ fm and 0.55$\pm 0.01(stat)$$^{+0.02}_{-0.03}(sys)$ fm respectively, corresponding to a neutron skin thickness $\Delta r_{np}$=0.15$\pm 0.03(stat)$$^{+0.01}_{-0.03}(sys)$ fm. The results give the first successful extraction of a neutron skin with an electromagnetic probe and indicate 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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Cited by 2 Pith papers

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    First differential cross-sections for γγ→ττ in Pb+Pb collisions yield 95% CL intervals -0.057 < a_τ < 0.035 and |d_τ| < 2.7×10^{-16} e cm.

  2. Coherent Elastic Neutrino-Nucleus Scattering at the Japan Proton Accelerator Research Complex

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