Particle-hole excited states in ¹³³Te

Excited states in neutron-rich ¹³³Te have been identified with the Gamma sphere array by measuring three- and higher-fold prompt coincidence events following spontaneous fission of ²⁵²Cf. Four types of particle-hole bands built on the known 334.3 keV isomer in ¹³³Te are identified. The yrast and near yrast particle-hole states observed up to 6.2 MeV in ¹³³Te have characteristics quite similar to those in ¹³⁴Te. These states are interpreted as a result of coupling a neutron νh_11/2 hole to the ¹³⁴Te 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 ¹³²Sn, and is a candidate for a tilted rotor band. Shell-model calculations considering ¹³²Sn 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.