Evolution of the πg9/2vh_(11/2)~2 multiplet in the neutron-rich _(49)In isotopes: Evidence for the gradual filling of the neutron sub-shell

摘要

High-spin states from the three-quasiparticle (3qp) configuration πg9/2vh_(11/2)~2 in the neutron-rich 49In isotopes have been studied in the framework of shell model calculation. The two-body residual interactions needed for such calculations have been extracted from the level schemes of neighbouring nuclei. In particular, the evolution of the proton-neutron πg9/2vh_(11/2) interaction has been analyzed as a function of the neutron number. When the gradual filling of the vh_(11/2) sub-shell is taken into account, the results of the 3qp configuration calculations are found to be very close to the experimental positive-parity yrast states located above 2 MeV excitation energy in ~(113-121)In. Moreover, several long-lived isomeric states with positive parity are predicted in ~(123,125,127)In.