The transition rates from the yrast 2+ and 4+ states in the self-conjugate Kr72 nucleus were studied via lifetime measurements employing the GRETINA array with a novel application of the recoil-distance method. The large collectivity observed for the 4+→2+ transition suggests a prolate character of the excited states. The reduced collectivity previously reported for the 2+→0+ transition was confirmed. The irregular behavior of collectivity points to the occurrence of a rapid oblate-prolate shape transition in Kr72, providing stringent tests for advanced theories to describe the shape coexistence and its evolution. © 2014 American Physical Society.
Evolution of collectivity in Kr 72: Evidence for rapid shape transition
RECCHIA, FRANCESCO;
2014
Abstract
The transition rates from the yrast 2+ and 4+ states in the self-conjugate Kr72 nucleus were studied via lifetime measurements employing the GRETINA array with a novel application of the recoil-distance method. The large collectivity observed for the 4+→2+ transition suggests a prolate character of the excited states. The reduced collectivity previously reported for the 2+→0+ transition was confirmed. The irregular behavior of collectivity points to the occurrence of a rapid oblate-prolate shape transition in Kr72, providing stringent tests for advanced theories to describe the shape coexistence and its evolution. © 2014 American Physical Society.Pubblicazioni consigliate
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