Aligned neutron--proton pairs in $N\sim Z$ nuclei

Abstract

It is argued that $N\sim Z$ nuclei with $90\le A\le 100$ can be interpreted in terms of aligned neutron--proton pairs with angular momentum $J=2j$ and isospin T=0. Based on this observation, a version of the interacting boson model is formulated in terms of isoscalar high-spin bosons. To illustrate its possible use, the model is applied to the $21^{+}$ isomer in ${}^{94}$Ag.

Comments: Accepted for publication in Physica Scripta T, Proceedings of the Nordic Conference on Nuclear Physics 2011, Stockholm, June 13-17