A microscopic classification of high-spin states in 56Fe

Abstract

A large-scale shell-model calculation on 56Fe including positive parity states with spins up to J = 15 shows that several states in the yrast region may be of a particular nature. These states can be locd in groups of which the gamma decay and quadrupole moments show a collective behaviour. The signature of each group is the f7/2 hole structure. This structure is coupled to a definite Jhole and Thole with the spin Jhole being as large as possible. The level density above the yrast region turns out to be largely independent of J.