Nuclear matter distribution inSn112,Sn116, andSn124from the (p,n) reaction

Angular distributions have been obtained for the quasielastic ($p,n$) reaction on ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sn}$, ${}_{}{}^{116}{}_{}{}^{}\mathrm{Sn}$, and ${}_{}{}^{124}{}_{}{}^{}\mathrm{Sn}$ at a proton energy of 22.8 MeV. Data are of sufficient precision to reveal differences in both the shape and magnitude of the angular distributions. Analysis in terms of a nuclear matter model indicates that the data are consistent with an increase in the ratio of the neutron to proton root-mean-square radius with increase in neutron excess.