The Yrast State Investigations of Odd-A Co Isotopes around N=28
A systematic comparison of the negative parity yrast states'energy level structures indicates a level inversion between the 9/2-and the 11/2-in 55Co,and suggests that 53Co and 57Co might exhibit strong collective effects.Shell model calculations based on the GXPF1A effective interaction accurately reproduce yrast state halo state energy levels of these nuc-lei,as well as the corresponding experimental magnetic moments and electric quadrupole moments.The shell model results show that the dominant component of proton configuration for the ground state 7/2-in 53-65Co is π(1f7/2)7.The excited states 9/2-and 11/2-in 55Co involve a competition between 1f7/2 proton excitation and 1f7/2 neutron excitation,leading to a possible level inversion between the these states.Moreover,by using the Constrained Hartree-Fock(CHF)method to study the quadrupole deformation characteristics of 53Co,55Co and 57Co,and combining the average occupancy numbers and con-figurations obtained from shell model calculations,the reasons for higher the excited state energies of 55Co compared to other Co isotopes were analyzed.
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