Global properties of K hindrance probed by the gamma decay of the warm rotating W-174 nucleus
2013 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 88, no 3, 034312- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. Vol. 88, no 3, 034312- p.
Quantum Number, Atomic-Nuclei, States, Isomers, Fluctuation, Alignment, Spectra, Region, Rays
IdentifiersURN: urn:nbn:se:kth:diva-131229DOI: 10.1103/PhysRevC.88.034312ISI: 000324305300001ScopusID: 2-s2.0-84885107087OAI: oai:DiVA.org:kth-131229DiVA: diva2:655368
QC 201310112013-10-112013-10-102013-10-11Bibliographically approved