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 i_(13/2).High-spin levels(27/2^(-))and(29/2^(-))in 135 Sb are taken over by the monopole effect induced by orbit i_(13/2).The ground state and excited levels in ^(136)Sb are well improved by considering the monopole correction between neutron orbits f_(7/2) and h_(9/2).The energy shrinking of the first excited state 5/2^(+)in ^(135,137)Sb isotopes is explained by theπd_(5/2) shift due to the attractiveπd5/2νf_(7/2) monopole interaction when increasingly more neutrons occupy orbit f_(7/2).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.