Improved measurement of the $0_2^+\rightarrow0_1^+$ E0 transition strength for $^{72}$Se 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. Nannini; P. Ruotsalainen; K. Starosta; C. E. Svensson; R. Wadsworth; J. Williams

doi:10.1103/physrevc.106.014312

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arXiv · 2207.06006

Improved measurement of the $0_2^+\rightarrow0_1^+$ E0 transition strength for $^{72}$Se using the SPICE spectrometer

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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 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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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. Nannini, P. Ruotsalainen, K. Starosta, C. E. Svensson, R. Wadsworth, J. Williams. 2022-07-13. Improved measurement of the $0_2^+\rightarrow0_1^+$ E0 transition strength for $^{72}$Se using the SPICE spectrometer. https://doi.org/10.1103/physrevc.106.014312

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