Shape Coexistence in 67Co, 66,68,70,72Ni, and 71Cu

Abstract : Analyses of data from both deep inelastic reactions at Argonne National Laboratory and single-and multiple-particle knockout reactions at Michigan State University revealed new gamma-ray transitions in even-even Ni-66,68,70,72(38,40,42,44) and in Co-67(40) that provide strong evidence for multiple shape coexistence at N = 38 and 40 and deep prolate minima in Ni-70(42) and isotonic Cu-71(42). A new transition at 642 keV is proposed for Ni-66 as the prolate 2(+) to 0(+) transition. Two new transitions in Ni-72 at 915 and 1225 keV were identified in the knock-out reaction study and could represent de-population of prolate states. Taken together with recent theoretical work using the Monte Carlo shell model, a well defined region of shape coexistence can be seen existing precisely between 38 <= N <= 44 for Co, Ni, and Cu nuclei.
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W.B. Walters, C.J. Chiara, R.V.F. Janssens, D. Weisshaar, T. Otsuka, et al.. Shape Coexistence in 67Co, 66,68,70,72Ni, and 71Cu . 3rd International Cconference on Nuclear Structure and Dynamics, Jun 2015, Portoroz, Slovenia. pp.UNSP 030007, ⟨10.1063/1.4932251⟩. ⟨in2p3-01298026⟩

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