Particle-hole excited states in Te-133
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abstract
Excited states in neutron-rich 133 Te have been identified with the Gamma sphere array by measuring three- and higher-fold prompt coincidence events following spontaneous fission of 252 Cf. Four types of particle-hole bands built on the known 334.3 keV isomer in 133 Te are identified. The yrast and near yrast particle-hole states observed up to 6.2 MeV in 133 Te have characteristics quite similar to those in 134 Te. These states are interpreted as a result of coupling a neutron h 11/2 hole to the 134 Te core. The group of states observed above 5.214 MeV is the result of a neutron particle-hole excitation of the double magic core nucleus 132 Sn, and is a candidate for a tilted rotor band. Shell-model calculations considering 132 Sn as a closed core have been performed and have provided guidance to the interpretation of the levels below 4.3 MeV. Very good agreement between theory and experiment is obtained for these states.