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 i13/2.High-spin levels(27/2-) and(29/2-) in 135 Sb are taken over by the monopole effect induced by orbit i13/2.The ground state and excited levels in 136 Sb are well improved by considering the monopole correction between neutron orbits f7/2and h9/2.The energy shrinking of the first excited state 5/2+in135,137Sb isotopes is explained by the πd5/2shift due to the attractive πd5/2vf7/2monopole interaction when increasingly more neutrons occupy orbit f7/2.The ground state of 139 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.