Rotational and vibrational states in Te-115

Abstract

High-spin states of the Te-115 were studied by in-beam spectroscopy with the Y-89 (Si-29, p2n) fusion-evaporation reaction at a beam energy of 108 MeV. gamma-gamma coincidence and gamma-gamma angular correlation analyses were employed for determining the level scheme of Te-115. We have identified two vibrational-like bands built on the vh(11/2) and vg(7/2) quasiparticle states and the noncollective oblate states from the full alignment of quasiparticle configurations. In addition, a regular Delta I = 2 sequence with positive-parity was found for the first time in odd-A Te nuclei. This sequence is interpreted as a deformed structure resulting from three-quasiparticle alignment having the [pi(g(7/2), h(11/2)) x v(h(11/2))] configuration. Calculations of total Routhian surfaces and cranked shell model were performed and were used for assigning quasiparticle configurations to the states in Te-115.