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 dripline. 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.
@article{arxiv.2207.06006,
title = {Improved measurement of the $0_2^+\rightarrow0_1^+$ E0 transition strength for $^{72}$Se using the SPICE spectrometer},
author = {J. Smallcombe and A. B. Garnsworthy and W. Korten and P. Singh and F. A. Ali and C. Andreoiu and S. Ansari and G. C. Ball and C. J. Barton and S. S. Bhattacharjee and M. Bowry and R. Caballero-Folch and A. Chester and S. A. Gillespie and G. F. Grinyer and G. Hackman and C. Jones and B. Melon and M. Moukaddam and A. Nannini and P. Ruotsalainen and K. Starosta and C. E. Svensson and R. Wadsworth and J. Williams},
journal= {arXiv preprint arXiv:2207.06006},
year = {2022}
}