Further monopole effects in neutron-rich Sb isotopes

The level spectra of neutron-rich Sb isotopes have been investigated within a shell-model space containing cross-shell excitations and the intruder orbit . High-spin levels (27/2 ) and (29/2 ) in Sb are taken over by the monopole effect induced by orbit . The ground state and excited levels in Sb are well improved by considering the monopole correction between neutron orbits and . The energy shrinking of the first excited state 5/2 in Sb isotopes is explained by the shift due to the attractive monopole interaction when increasingly more neutrons occupy orbit . The ground state of Sb is predicted as 5/2 owing to the shrinking of the 5/2 states in Sb isotopes that causes ground state inversion when N = 88. Further monopole effects extend the applicable range of the present Hamiltonian to nuclei with more neutrons above the N = 82 shell. This Hamiltonian will be public, and researchers are encouraged to contact the authors.