Low-lying states of121Sbstudied in the123Sb(p,t)reaction

Abstract

Angular distributions of tritons from the ${}^{123}\mathrm{Sb}{(p,t)}^{121}\mathrm{Sb}$ reaction induced by 26 MeV protons have been measured up to an excitation energy of about 3 MeV using a Q3D spectrometer. Many previously unknown levels of ${}^{121}\mathrm{Sb}$ have been observed. Microscopic calculations of the ${}^{123}\mathrm{Sb}{(p,t)}^{121}\mathrm{Sb}$ reaction cross sections, using the quasiparticle-phonon model, give a reasonably good description of the fragmentation of the (p,t) cross sections and the lack of (p,t) strength above 2.7 MeV of excitation energy. The experimental results from the ${}^{122}\mathrm{Sn}{(p,t)}^{120}\mathrm{Sn}$ reaction have been used to discuss the role of the unpaired quasiparticle in ${}^{121}\mathrm{Sb}$ in determining the properties of its levels.