Abstract
The hindrance to the decay is studied in the warm rotating W nucleus, focusing on the weakening of the selection rules of the quantum number with increasing excitation energy. W was populated by the fusion reaction of Ti (at 217 MeV) on a Te target, and its decay was detected by the AGATA Demonstrator array coupled to a BaF multiplicity filter at Laboratori Nazionali di Legnaro of INFN. A fluctuation analysis of coincidence matrices gives a similar number of low- and high- discrete excited bands. The results are compared to simulations of the -decay flow based on a microscopic cranked shell model at finite temperature in which the mixing is governed by the interplay of Coriolis force with the residual interaction. Agreement between simulations and experiment is obtained only by hindering the decay between low- and high- bands by an amount compatible with that determined by spectroscopic studies of isomers in the same mass region, with a similar trend with excitation energy. The work indicates that mixing due to temperature effects may play a leading role for the entire body of discrete excited bands, which probes the onset region of weakening.
3 More- Received 26 July 2013
DOI:https://doi.org/10.1103/PhysRevC.88.034312
©2013 American Physical Society