The neutron skin of 208Pb from coherent pion photoproduction

Tarbert, C. M. et al. (2014) The neutron skin of 208Pb from coherent pion photoproduction. Physical Review Letters, 112(24), p. 242502. (doi: 10.1103/PhysRevLett.112.242502)

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Information on the size and shape of the neutron skin on 208Pb 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. Exploiting 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±0.03(stat) fm and 0.55±0.01(stat)+0.00−0.025(sys) fm respectively, corresponding to a neutron skin thickness Δrnp=0.15±0.03(stat)+0.00−0.03(sys) fm. The results give the first successful extraction of a neutron skin with an electromagnetic probe and indicate the skin of 208Pb 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.

Item Type:Articles (Letter)
Glasgow Author(s) Enlighten ID:McGeorge, Dr John and Owens, Professor Robert and Downie, Dr Evangeline and Livingston, Dr Kenneth and Codling, Mr Richard and MacGregor, Professor Douglas and Annand, Dr John and Watts, Dr Daniel and Glazier, Dr Derek and Rosner, Professor Guenther
Authors: 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, E., 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., Rostomyan, T., Schadmand, S., Schumann, S., Sober, D., Starostin, A., Supek, I., Thomas, A., Unversagt, M., Walcher, T., and Zehr, F.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Nuclear Physics
Journal Name:Physical Review Letters
Journal Abbr.:Phys.Rev. Lett.
Publisher:American Physical Society
ISSN (Online):1079-7114
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