Excited states and deformation of 112Xe

Abstract

Excited states have been identified in the very neutron-deficient 112Xe nucleus. The ground-state band has been observed up to spin 12 ℏ, and a negative-parity side band has been observed up to 13 ℏ. The bands have been assigned to 112Xe by detecting gamma rays in coincidence with evaporated charge particles and neutrons. The energy of the 21+ state in 112Xe is lower than would be expected from both calculations and from systematics of the neighboring xenon isotopes, which indicates a larger than expected ground-state deformation. The observations of a low-lying 3- state and large deduced B(E1) values are suggestive of increased octupole correlations, which may explain the apparently large ground-state deformation. Constrained Hartree-Fock+BCS calculations have been performed which show qualitative agreement with the trend in deformation of the very neutron-deficient xenon isotopes. Show more