In-beamγspectroscopy of the odd-Znucleus139Pm

Abstract

High-spin states in ${}^{139}$Pm are investigated via the ${}^{116}$Cd(${}^{27}$Al, 4$n$)${}^{139}$Pm fusion-evaporation reaction at a beam energy of 120 MeV. The previously reported level scheme has been modified because of identifications of some linking and doublet transitions. The revised yrast $\ensuremath{\pi}{h}_{11/2}$ band obviously undergoes $\ensuremath{\pi}{h}_{11/2}$ $\ensuremath{\rightarrow}$ $\ensuremath{\pi}{({h}_{11/2})}^{3}$ $\ensuremath{\rightarrow}$ $\ensuremath{\pi}{({h}_{11/2})}^{3}$$\ensuremath{\bigotimes}$$\ensuremath{\nu}{({h}_{11/2})}^{\ensuremath{-}2}$ band crossings at $\ensuremath{\hbar}\ensuremath{\omega}=0.45$ and 0.39 MeV. Two negative-parity dipole bands have been assigned as $\ensuremath{\pi}{h}_{11/2}$$\ensuremath{\bigotimes}$$\ensuremath{\nu}{({h}_{11/2})}^{\ensuremath{-}2}$ and $\ensuremath{\pi}{h}_{11/2}$$\ensuremath{\bigotimes}$$\ensuremath{\nu}{({h}_{11/2})}^{\ensuremath{-}4}$ configurations, respectively, and can be considered as examples of magnetic rotational bands.