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Global properties of K hindrance probed by the gamma decay of the warm rotating W-174 nucleus

Abstract : The K hindrance to the gamma decay is studied in the warm rotating W-174 nucleus, focusing on the weakening of the selection rules of the K quantum number with increasing excitation energy. W-174 was populated by the fusion reaction of Ti-50 (at 217 MeV) on a Te-128 target, and its gamma decay was detected by the AGATA Demonstrator array coupled to a BaF2 multiplicity filter at Laboratori Nazionali di Legnaro of INFN. A fluctuation analysis of gamma coincidence matrices gives a similar number of low-K and high-K discrete excited bands. The results are compared to simulations of the gamma-decay flow based on a microscopic cranked shell model at finite temperature in which the K mixing is governed by the interplay of Coriolis force with the residual interaction. Agreement between simulations and experiment is obtained only by hindering the E1 decay between low-K and high-K bands by an amount compatible with that determined by spectroscopic studies of K isomers in the same mass region, with a similar trend with excitation energy. The work indicates that K mixing due to temperature effects may play a leading role for the entire body of discrete excited bands, which probes the onset region of K weakening.
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Contributor : Christine Hadrossek Connect in order to contact the contributor
Submitted on : Monday, May 31, 2021 - 9:52:20 AM
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V. Vandone, S. Leoni, G. Benzoni, N. Blasi, A. Bracco, et al.. Global properties of K hindrance probed by the gamma decay of the warm rotating W-174 nucleus. Physical Review C, American Physical Society, 2013, 88, pp.034312. ⟨10.1103/PhysRevC.88.034312⟩. ⟨in2p3-00916808⟩



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