Energy Levels in Sn122, Sn123, Sn124, and Sn125

Abstract

Studies of the energy levels of ${\mathrm{Sn}}^{122}$, ${\mathrm{Sn}}^{123}$, ${\mathrm{Sn}}^{124}$, and ${\mathrm{Sn}}^{125}$ have been made utilizing the reactions ${\mathrm{Sn}}^{122}(d, p){\mathrm{Sn}}^{123}$, ${\mathrm{Sn}}^{122}(p, p^{\prime }){\mathrm{Sn}}^{122}$, ${\mathrm{Sn}}^{124}(d, p){\mathrm{Sn}}^{125}$, and ${\mathrm{Sn}}^{124}(p, p^{\prime }){\mathrm{Sn}}^{124}$. Protons resulting from 11- to 12-MeV protons and deuterons incident on separated Sn isotopes were analyzed in a broad range magnetic spectrograph. The $Q$ values of the ($d, p$) reactions on ${\mathrm{Sn}}^{122}$ and ${\mathrm{Sn}}^{124}$ are 3726±12 keV and 3506±12 keV, respectively. There are considerable differences between the level structure observed in these studies and those of Cohen and Price ${\mathrm{Sn}}^{123}$ and ${\mathrm{Sn}}^{125}$ which result largely from the higher resolution available in this experiment. Probably these differences do not alter drastically the main conclusions in the assignment of single-particle states and in the analysis in terms of the pairing model.