Neutron skin of (208)pb from coherent pion photoproduction.

@article{Tarbert2014NeutronSO,
  title={Neutron skin of (208)pb from coherent pion photoproduction.},
  author={C. M. Tarbert and D P Watts and D. I. Glazier and Pablo Aguar and James P Ahrens and J.R.M. Annand and H. -J. Arends and Reinhard D. Beck and V. S. Bekrenev and B{\'e}n{\'e}dicte Boillat and Alessandro Braghieri and Derek Branford and William J. Briscoe and Jason Brudvik and S. N. Cherepnya and R. F. B. Codling and E. J. Downie and K. Foehl and P. Grabmayr and Richard W. Gregor and E. Heid and David Hornidge and Oliver Jahn and V. Kashevarov and Andrea Kne{\vz}evi{\'c} and R. L. Kondratiev and Marina Korolija and Martin Kotulla and D. Krambrich and B. Krusche and M. Lang and V. P. Lisin and Kenneth Livingston and Stefan Lugert and I J D Macgregor and D. Mark Manley and M. Martinez and J. C. Mcgeorge and Darko Mekterovic and V. Metag and B. M. K. Nefkens and Alexander Nikolaev and Radek Novotny and R. O. Owens and P. Pedroni and A. Polonski and S. N. Prakhov and Joseph Price and Guenther Rosner and M. Rost and Tigran Rostomyan and Susan Schadmand and Svenja Schumann and Daniel I. Sober and A. Starostin and Ivan Supek and A. Thomas and Marc Unverzagt and Thomas Walcher and Lorenzo Zana and Fabien Zehr},
  journal={Physical review letters},
  year={2014},
  volume={112 24},
  pages={
          242502
        }
}
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… 

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