Improved measurement of the 02+→01+ E0 transition strength for Se 72 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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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 Se72 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
Number of pages9
JournalPhysical Review C
Issue number1
Publication statusPublished - 19 Jul 2022

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