Shape Coexistence in 78 Ni and the new Island of Inversion
Abstract
Large Scale Shell Model calculations (SM-CI) predict that the region of deformation which comprises the heaviest Chromium and Iron isotopes at and beyond N=40 will merge with a new one at N=50 in an astonishing parallel to the N=20 and N=28 case in the Neon and Magnesium isotopes. We propose a valence space including the full pf-shell for the protons and the full sdg shell for the neutrons; which represents a comeback of the the harmonic oscillator shells in the very neutron rich regime. The onset of deformation is understood in the framework of the algebraic SU3-like structures linked to quadrupole dominance. Our calculations preserve the doubly magic nature of the ground state of 78 Ni, which, however, exhibits a well deformed prolate band at low excitation energy, providing a striking example of shape coexistence far from stability.
Keywords
Cite
@article{arxiv.1605.05103,
title = {Shape Coexistence in 78 Ni and the new Island of Inversion},
author = {F Nowacki and A Poves and E Caurier and B Bounthong},
journal= {arXiv preprint arXiv:1605.05103},
year = {2017}
}