High-spin spectroscopy of 109Te.

Abstract

Excited states of the neutron deficient nucleus $^{109}\mathrm{Te}$ were identified for the first time in the $^{54}\mathrm{Fe}$${(}^{58}$Ni,2pn) reaction by in-beam \ensuremath{\gamma}-spectroscopic methods. The nordball detector array, equipped with a charged-particle and a neutron detector system for reaction channel identification, was used to detect the evaporated particles and \ensuremath{\gamma} rays. A level scheme was constructed on the basis of \ensuremath{\gamma}\ensuremath{\gamma}-coincidence relations, and the angular momenta of the states were determined from the measured angular correlation intensity ratios. Two favored bands built on the \ensuremath{\nu}${\mathit{g}}_{7/2}$ and \ensuremath{\nu}${\mathit{h}}_{11/2}$ neutron quasiparticle states were identified. The structure of the nucleus is discussed in the framework of the particle-vibration coupling model using the interacting boson-fermion formalism up to spin 27/2. The negative parity sequence is compared to Total Routhian Surface calculations.