Multi-quasiparticle excitations and the impact of the high-j intruder orbital in the N = 51 93Mo nucleus *

Abstract

Abstract The level structures of Mo are investigated using Large Scale Shell Model calculations, and reasonable agreement is obtained between the experimental and calculated values. The calculated results show that the lower-lying states are mainly dominated by proton excitations from the , , and orbitals into the higher orbitals across the Z = 38 or Z = 40 subshell closure. For the higher-spin states, multi-particle excitations, including the excitation of neutrons across the N = 56 subshell closure into the high-j intruder orbital, are essential. Moreover, the previously unknown spin-parity assignments of the six higher excited states in Mo are inferred from the shell model calculations.