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Neutron skin of $^{208}$Pb from Coherent Pion Photoproduction

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

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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keywords neutronskinstatcoherentcrossmeasuredphotoproductionpion
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abstract

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 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Direct versus resolved photons in DPS in photoproduction on proton and nuclei

    hep-ph 2026-08 conditional novelty 6.0 of 10

    In photoproduction double parton scattering, the 1⊗2 parton-splitting mechanism boosts resolved-photon cross sections by up to a factor 1.6, and direct photons dominate charm final states for x_γ above 0.3-0.4.

  2. Unraveling the neutron skin thickness through jet charge in deep inelastic scattering

    hep-ph 2025-06 conditional novelty 6.0 of 10

    Jet charge distributions in electron-ion collisions are shown to be sensitive to neutron skin thickness, with peripheral collisions suppressing positive jets and enhancing negative jets.

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

    hep-ph 2025-12 unverdicted novelty 4.0 of 10

    High-statistics CEνNS measurements at J-PARC are feasible with significant sensitivity to relevant particle physics scenarios using currently funded detectors.

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