{"paper":{"title":"Neutron skin of $^{208}$Pb from Coherent Pion Photoproduction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"nucl-ex","authors_text":"A. Braghieri, A. Knezevic, A. Nikolaev, A. Polonski, A. Starostin, A. Thomas, B. Boillat, B. Krusche, B.M.K. Nefkens, C.M. Tarbert, D. Branford, D. Hornidge, D.I. Glazier, D. Krambrich, D. Mekterovic, D.M. Manley, D.P. Watts, D. Sober, E. Heid, E.J. Downie, F. Zehr, G. Rosner, H.J. Arends, I.J.D. MacGregor, I. Supek, J. Ahrens, J. Brudvik, J.C. McGeorge, J.R.M. Annand, J.W. Price, K. Foehl, K. Livingston, M. Korolija, M. Kotulla, M. Lang, M. Martinez, M. Rost, M. Unverzagt, O. Jahn, P. Aguar, P. Grabmayr, P. Pedroni, R. Beck, R. Codling, R. Gregor, R. Kondratiev, R. Novotny, R.O. Owens, S. Cherepnya, S. Lugert, S.N. Prakhov, S. Schadmand, S. Schumann, Th. Walcher, T. Rostomyan, V. Bekrenev, V. Lisin, V.L. Kashevarov, V. Metag, W.J. Briscoe","submitted_at":"2013-11-01T12:42:01Z","abstract_excerpt":"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}(s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.0168","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}