Improved measurement of the 02+ → 01+ E0 transition strength for 72Se using the SPICE spectrometer

J. Smallcombe*, A. B. Garnsworthy, W. Korten, P. Singh, F. A. Ali, C. Andreoiu, S. Ansari, G. C. Ball, C. J. Barton, S. S. Bhattacharjee, M. Bowry, R. Caballero-Folch, A. Chester, S. A. Gillespie, G. F. Grinyer, G. Hackman, C. Jones, B. Melon, M. Moukaddam, A. NanniniP. Ruotsalainen, K. Starosta, C. E. Svensson, R. Wadsworth, J. Williams

*Corresponding author for this work

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Abstract

The selenium isotopes lie at the heart of a tumultuous region of the nuclear chart where shape coexistence effects grapple with neutron-proton pairing correlations, triaxiality, and the impending proton drip line. In this work, a study of 72Se by internal conversion electron and γ-ray spectroscopy was undertaken with the SPICE and TIGRESS arrays. New measurements of the branching ratio and lifetime of the 02+ state were performed, yielding a determination of ρ2 (E0;02+→01+)=29(3) milliunits. Two-state mixing calculations were performed that highlighted the importance of interpretation of such E0 strength values in the context of shape coexistence.
Original languageEnglish
Article number014312
JournalPhysical Review C
Volume106
Issue number1
DOIs
Publication statusPublished - 19 Jul 2022
Externally publishedYes

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