Decay properties of the 19/2? isomers in113,117Sb

Abstract

By means of the generalized centroid-shift method, the following half-lives were determined:T1/2(3045 keV)=3.7±0.3 ns in113Sb using the reaction104Pd(12C,p2n) as well asT1/2 (1322.8 keV)=3.5±0.3 ns,T1/2(2779.8 keV) =0.50±0.15ns,T1/2(2874.9 keV)<0.2 ns andT1/2(3072.9 keV)<0.1 ns in117Sb using the116In(α, 2n) reaction. Three-quasiparticle configurations of the type πd5/2ν(h11/2d3/2) in113,117Sb are found to dominate in the wave functions of the 19/2− states at 3045 and 2780 keV in113Sb and117Sb, respectively. TheB(E2, 19/2− → 15/2−) values in113–119Sb are discussed.