High spin states in 63Cu

Abstract

High-spin states in 63Cu were investigated through in-beam γ-ray spectroscopic techniques using the 52Cr(18O,αp2n) fusion-evaporation reaction at a beam energy of 72.5 MeV. The γ-rays emitted by the excited nucleus were recorded in the coincidence mode using fourteen Compton suppressed Ge clover detectors of the Indian National Gamma-ray Array (INGA). Based on the γ-γ coincidence data, twenty-one new γ-ray transitions have been observed and placed --thereby extending the level scheme of 63Cu up to spin 25 / 2 ℏ and excitation energy ∼ 8. 36 MeV. Shell model calculations are performed in the f5 / 2pg9 / 2 model space with a 56Ni core using two effective interactions, viz. JUN45 and jj44b to interpret the observed excited states of this nucleus. A reasonable agreement is found between the experimental finding and the shell-model calculations --which implies that the excitations within the f5 / 2p3 / 2p1 / 2 orbitals are more dominant in defining the observed level structure than the excitation across the magic shell gap N= Z= 28. © 2018, SIF, Springer-Verlag GmbH Germany, part of Springer Nature.