We have performed measurements of the 0g.s.+→21+ excitations in the neutron-rich isotopes 48,50Ca via inelastic proton scattering on a liquid hydrogen target, using the GRETINA γ-ray tracking array. A comparison of the present results with those from previous measurements of the lifetimes of the 21+ states provides us the ratio of the neutron and proton matrix elements for the 0g.s.+→21+ transitions. These results allow the determination of the ratio of the proton and neutron effective charges to be used in shell model calculations of neutron-rich isotopes in the vicinity of 48Ca.
@article{arxiv.1407.5348,
title = {Inverse-kinematics proton scattering on $^{50}$Ca: Determining effective charges using complementary probes},
author = {L. A. Riley and M. L. Agiorgousis and T. R. Baugher and D. Bazin and M. Bowry and P. D. Cottle and F. G. DeVone and A. Gade and M. T. Glowacki and K. W. Kemper and E. Lunderberg and D. M. McPherson and S. Noji and F. Recchia and B. V. Sadler and M. Scott and D. Weisshaar and R. G. T. Zegers},
journal= {arXiv preprint arXiv:1407.5348},
year = {2015}
}