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R. R. Johnson; T. Masterson; B. Bassalleck; W. Gyles; T. Marks; K. L. Erdman; A. W. Thomas; D. R. Gill; E. Rost; J. J. Kraushaar; J. Alster; C. Sabev; J. Arvieux; M. Krell

doi:10.1103/PhysRevLett.43.844

Neutron Radii Determinations from the Ratio of $π^{-}$ Elastic Scattering from ${}^{12, 13}C$ and ${}^{16, 18}O$

R. R. Johnson, T. Masterson, B. Bassalleck, W. Gyles, T. Marks, K. L. Erdman, A. W. Thomas, D. R. Gill, E. Rost, J. J. Kraushaar, J. Alster, C. Sabev, J. Arvieux, and M. Krell

Phys. Rev. Lett. 43, 844 – Published 17 September 1979

Abstract

Differential elastic cross-section ratios and absolute cross sections have been measured for ${}^{12, 13}C$ at 29.2-and 49.5-MeV average $π^{-}$ energy and for ${}^{16, 18}O$ at 29.2 MeV. Range telescopes detected the scattered pions. The ratio data were compared with different optical-potential calculations to extract neutron radii of 2.35 ± 0.03 fm for ${}^{13}C$ and 2.81 ± 0.03 fm for ${}^{18}O$ , relative to the neutron radii of ${}^{12}C$ (2.31) and ${}^{16}O$ (2.60), respectively. Our studies indicate little sensitivity to the optical model used.