Study of proton-hole states in 61Co using the 62Ni(d, 3He) 61Co reaction at 78 MeV

Abstract

The 62Ni(d, 3He) 61Co reaction was studied at a bombarding energy of 78 MeV. Angular distributions were measured in the range of θ lab = 4.5° to 25°. Energy levels up to 5.0 MeV excitation energy in 61Co were studied. Exact finite-range DWBA calculations were employed to extract spectroscopic factors. Shell-model calculations were carried out in the truncated fp-model space. Qualitatively good agreement between theory and experiment is observed for the states based on fp components. In addition, calculations of the energy levels in 61Co were performed in the SU(6) particle-vibration model (PTQM). Spectroscopic factors have been calculated by using the PTQM transfer-operator form arising microscopically on the basis of RPA. This operator contains an additional term which has no counterpart in the interaction boson-fermion model (IBFM). Rather good agreement between theory and experiment was obtained.