Abstract
The gamma-ray decay of isomers in near spherical Sb-119,Sb-121 and transitional I-121,I-123 have been studied using gamma-ray spectroscopy with Li-7 pulsed beams delivered from 14 UD Pelletron accelerator at the Australian National University. Isomers of J(pi) = 25/2(+), 19/2(-) and 21/2(-) with half-lives of a few nanoseconds to hundreds microseconds have been observed at 2.4 < E-x < 2.9 MeV. Decay schemes of the isomers in these nuclei are presented and their properties are interpreted in terms of three quasiparticle configurations based on the two-neutron (h(11/2))(2) 10(+) and (d(3/2)h(11/2)) 7(-) states in even-A Sn isotones coupled to an extra proton.
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