A shell model of the cobalt isotopes

Abstract

Binding energies, excitation energies, and single nucleon transfer spectroscopic factors of the 55 ≤ A ≤ 60 cobalt isotopes have been calculated in a 1f–2p shell configuration space assuming a 56Ni core. Single-particle energies were determined empirically and two-body matrix elements were computed with the modified surface delta interaction (MSDI). The observed properties of the low-lying states are reasonably well reproduced but some low-spin states observed above 1.3 MeV are outside the model space. The theory predicts quasi-rotational bands of high-spin states in both odd- and even-A cobalt isotopes.