Abstract
Shell-model calculations for the N = 50 nucleus 86Kr are presented and compared to results of recent in-beam experiments. Two model spaces are considered: a pure proton configuration space containing the 0f5/2, 1p=3/2, 1p½, 0g=9/2 orbitals and a model space including additionally the particle-hole excitation generated by one neutron lifted from the 0g9/2 orbital across the shell gap to the 1d=5/2 orbital. The predictions of the shell-model using various sets of residual interactions and based on pure proton excitations are comparable with the experimental findings for the states of positive parity below 4 MeV and for the negative-parity states with spins up to 7−. The inclusion of neutron-core excitations causes an improved agreement between experimental und calculated level energies for the positive-parity yrast states with spins 7h, 9h and 10h. The interpretation of neutron-core excited high-spin states is supported by the comparison of the level structure of 8636Kr50 to the experimental levels of the valence-mirror nucleus 6428Ni36.
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