Shape coexistence and octupole correlations in 72Se

In the present paper, we report the results from the study of excited states in the Se-72 nucleus using the Cr-50(Si-28, alpha 2p) Se-72 fusion evaporation reaction at a beam energy of 90 MeV. The deexciting y rays were detected using the Indian National Gamma Array (INGA). A total of ten new gamma-ray transitions have been identified using the gamma-gamma coincidence technique. The K-pi = 0(2)(+) band based on an isomeric state has been extended up to a (10(+)) state at 5.473 MeV excitation energy, and four new interconnecting transitions have been placed between this band and yrast band. Further, the enhanced interconnecting E1 transitions between positive- and negative-parity bands suggest the existence of octupole correlations in this nucleus. The characteristics of the observed bands in the experiment have been interpreted in terms of the total Routhian surface (TRS) calculations.

Automated summary

In this study, excited states in the Se-72 nucleus were investigated using experimental observation and theoretical calculations. New gamma-ray transitions were identified, and enhanced interconnecting transitions between positive- and negative-parity bands were found, suggesting the existence of octupole correlations in this nucleus.