N=50 core excited states studied in the 4696Pd50 nucleus

Abstract

The four-proton hole 96Pd neighbor of the doubly-magic 100Sn nucleus was studied in-beam, using a fusion-evaporation reaction of a 58Ni beam on a 45Sc target. States of 96Pd were established up to an excitation energy of 9707 keV. A core-excited odd-parity isomer with T1/2=37.7(1.1) ns was identified. Shell model calculations were performed in four different model spaces. Even-parity states of 96Pd are very well reproduced in large-scale shell model (LSSM) calculations in which excitations are allowed of up to five g 9/2 protons and neutrons across the N=Z=50 gap, to the g 7/2, d5/2, d3/2, and s1/2 orbitals. The odd-parity isomer can be only qualitatively interpreted though, employing calculation in the full fpg shell model space, with just one particle-hole core excitation. © 2012 American Physical Society.