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Alignment; projected shell model; lifetime; shell gap

Lifetimes of high spin states up to {$$I^\pi $$}=22⁺ in the yrast positive parity bands have been measured to investigate the shape evolution with increasing spin in ^{72, 74}Se. The Q_t values derived from these measurements indicate that prolate shape stabilizes for ⁷²Se, while a triaxial shape develops for ⁷⁴Se at higher spins. Comparison of the observed trend in Q_t with spin for ^{72, 74}Se with that of the corresponding kryptones isotones emphasizes the stability provided by N=38 prolate shell gap even at high rotational frequency.

R Palit¹ HC Jain¹ PK Joshi¹ JA Sheikh¹

1. Tata Institute of Fundamental Research, Mumbai - 400 005, India

Published

July 2001