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Improved measurement of the $$0_2^+rightarrow0_1^+$$ $$E$$0 transition strength for $$^{72}$$Se using the SPICE spectrometer

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

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

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 $$^{72}$$Se by internal conversion electron and $$gamma$$-ray spectroscopy was undertaken with the SPICE and TIGRESS arrays. New measurements of the branching ratio and lifetime of the $$0_2^+$$ state were performed yielding a determination of $$rho^2(E0; 0_2^+{rightarrow}0_1^+)=29(3)$$ milliunits. Two state mixing calculations were performed that highlighted the importance of interpretation of such $$E0$$ strength values in the context of shape-coexistence.

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