¹²⁴<font>Te</font> AND THE E(5) CRITICAL POINT SYMMETRY

Abstract

We present a new study of the low-lying states in 124 Te nucleus by γ-ray spectroscopy following 124 I β + /ε decay. The β radioactive sources were produced in the 124 Te ( p, n ) 124 I reaction induced by 11 MeV protons, delivered by the Bucharest FN Tandem Accelerator. The γ-rays were measured in a low background area with three large volume HPGe detectors. A total number of 276 milion double coincidence events were recorded in a six-day run. Most of the gamma line intensities previously measured were confirmed with improved accuracy and several gamma lines were obtained for the first time. Our results, combined with those from a recent ( n , γ) study are compared with the predictions of the E(5) critical point symmetry model and numerical IBA-1 model calculations at the critical point of the U(5)–O(6) phase transition.