Possible Magnetic Rotational Bands in 84^Rb

TL;DR

This paper reports the discovery of three magnetic rotational bands in high-spin states of 84Rb, characterized by regular level spacings and predominantly M1 transitions, expanding understanding of nuclear structure in this isotope.

Contribution

It provides the first identification of magnetic rotational bands in 84Rb through gamma-ray spectroscopy and analysis of transition properties.

Findings

Three high-lying negative-parity bands identified

Level spacings are very regular with no signature splitting

Transitions are predominantly M1 with weak or no E2 components

Abstract

High-spin states in 84Rb are studied by using the 70Zn(18O, p3n)84Rb reaction at a beam energy of 75 MeV. Three high-lying negative-parity bands are established, whose level spacings are very regular, i.e., there is no signature splitting. The dipole character of the transitions of these three bands is assigned by the gamma-gamma directional correlations of oriented states (DCO) intensity ratios and the multipolarity M1 is suggested by analogy with multiparticle excitations in neighboring nuclei. Strong M1 and weak or no E2 transitions are observed. All these characteristic features show they are magnetic rotational bands.