Ponente
Descripción
Coherent motion of neutrons and protons in self-conjugate nuclei is a unique feature of nuclear many-body system. In the A=80 region, an emergence of large collectivity of the N=Z nuclei indicates large cross-shell excitation of protons and neutrons, predicting shape coexistence [1]. Experimentally a salient deviation of the correlation between B(E2; 2_1+ -> 0_1+) and R_4/2 of N=Z nuclides also implies shape coexistence [2]. However, the second 0+ state has been identified up to 72Kr [3]. Here we aim to identify the second 0+ state in the next even-even self-conjugate nuclide 76Sr from the beta-gamma spectroscopy. Since an inversion of ground-state shape from oblate to prolate is expected in 76Sr, observing the second 0+ state will provide valuable information on shape competition in this region. Moreover, the observation will be a doorway to understand the multiple shape coexistence predicted in 80Zr [4]. Regarding the experimental setup, we focus on the production of 76Y and expect 0.08 cps at the F11 focal plane. A 5-day beamtime will sufficiently populate the 1- state in 76Y, and the second 0+ state in 76Sr following beta decay.
