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Study of $$^{70,72}$$Se nuclear shapes with SPICE and TIGRESS

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 phenomenon of shape coexistence is prevalent in the Z$$sim$$34 region, with isotopes of neutron-deficient even Ge, Se and Kr each exhibiting the characteristic low-lying coexisting 0+ bands which display quadrupole deformation different to that of the ground states. In the selenium isotopes, $$^{72-78}$$Se seem to show a prolate ground structure with shape coexisting oblate excitation, while in $$^{68}$$Se the oblate structure appears to have become the ground state. The exact nature of the low-lying structure $$^{70}$$Se and any shape coexistence remains uncertain. Combining the Spectrometer for Internal Conversion Electrons (SPICE) with the TIGRESS HPGe Array, a full electron and gamma-ray experimental study of $$^{70}$$Se, $$^{72}$$Se was undertaken at the TRIUMF ISAC-II facility to unveil the low-lying structure of these nuclei. Details of the device and experiment will be presented, alongside the experimental results and possible structural interpretations for both isotopes.

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