PREPRINT
D303B7AA-096B-4EE4-A345-D396CAB825E8

# N=Z Waiting Point Nucleus ${}^{68}$Se: Collective Rotation and High-K Isomeric States

Yang Sun, Zhanwen Ma, Ani Aprahamian, Michael Wiescher

Submitted on 1 July 2001

## Abstract

The structure of collective states and quasi-particle excitations in ${}^{68}$Se is analyzed by using the projected shell model. It is found that the ${g}_{9/2}$ orbitals play a decisive role for the structure of this nucleus. At the prolate minimum, alignment of the low-K states causes the observed first backbending in moment of inertia and we predict a second backbending that has not yet been reported. At the oblate minimum, quasi-particles having high-K can form long-lived isomeric states. The structure of ${}^{68}$Se is discussed with respect to the isomers and their possible impact on the determination of its nuclear mass.

## Preprint

Comment: 4 pages, 3 eps figures

Subjects: Nuclear Theory; Astrophysics; Nuclear Experiment