Three Magnetic Rotation Bands in 84^Rb

TL;DR

This paper reports the discovery of three magnetic rotation bands in the nucleus 84Rb, characterized by regular level spacings and strong M1 transitions, advancing understanding of high-spin states in this isotope.

Contribution

It identifies and characterizes three magnetic rotation bands in 84Rb, providing new experimental data on high-spin nuclear structure.

Findings

Three high-lying negative-parity bands established

Level spacings are very regular with no signature splitting

Transitions are predominantly M1 with weak or no E2

Abstract

High-spin states in $^{84}$Rb are studied by using the $^{70}$Zn($^{18}$O, p3n)$^{84}$Rb reaction at beam energy of 75 MeV. Three high-lying negative-parity bands are established, whose level spacings are very regular, i.e., there don't exist 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 the analogy to multiparticle excitations in neighboring nuclei. The strong M1 and weak or no E2 transitions are observed. All these characteristic features show they are magnetic rotation bands.