Neutron-Core Excitations in 3686Kr50


Neutron-Core Excitations in 3686Kr50

Reif, J.; Winter, G.; Schwengner, R.; Prade, H.; Grawe, H.; Schubart, R.

Shell-model calculations for the N=50 nucleus 86Kr are presented
and compared toresults of recent in-beam experiments. Two model spaces
are considered: a pure proton configuration space containing the 0f5/2,
1p3/2, 1p1/2, 0g9/2 orbitals and a model
space including additionally the particlehole  excitation generated
by one neutron lifted from the 0g9/2 orbital across the shell
gap to the 1d5/2 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 and calculated level energies for the positive-parity
yrast states with spins 7, 9 and 10. The interpretation of neutron-core
excited high-spin states is supported by the comparision of the level structure
of 36 86Kr50 to the experimental levels
of the valence-mirror nucleus 28 64Ni36.

  • Physica Scripta T56 (1995) pp. 303

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Publ.-Id: 237