Abstract

Yrast levels of 60Ni were investigated via the study of in-beam γ-rays induced by 15–25 MeV α-partictes on 58Ni, 26–48 MeV 12C ions on 50Cr and 30–60 MeV 16O ions on 46Ti. The compound nucleus formed by these target-projectile combinations is 62Zn, and its decay by two-proton emission populates yrast levels of 60Ni. The ordering and decay modes of the yrast levels were determined from the analyses of in-beam γ-ray angular distribution and γ-γ coincidence measurements. The new levels established are at 4.262, 5.345 and 6.807 MeV. These together with the known 21+ (1.332 MeV) and 41+(2.505 MeV) levels constitute the yrast cascade. The spin assignments based on the present study are 6, 7, 9 for the 4.262, 5.345 and 6.807 MeV levels, respectively. The excitation functions for the yrast γ-rays from the 50Cr(12C, 2p)60Ni reaction show peaks near 33 MeV incident energy.

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