Gamow-Teller decay population of 64Ni levels in the decay of 1+ 64Co

Abstract

The 64Co β-decay feeding levels in the well-studied 64Ni nucleus were investigated. Whereas the previously known 64Co decay scheme merely contained 2 γ rays, the decay scheme established in this work contains 18, of which 5 are observed in this work and 6 were previously observed in an (n,γ) study but not placed in the 64Ni level scheme. Surprisingly, one additional level - placed at an excitation energy of 3578.7 keV - could be determined. The observed β-decay paths involve allowed νf5/2→πf7/2 and νp1/2→πp3/2 transitions. Three strongly fed levels around 4 MeV are interpreted to possess possible proton-intruder character. © 2012 American Physical Society.