Weak and strong signature splitting in doubly-odd 132Pr.

Abstract

An investigation of the collective structures in the doubly-odd nucleus $^{132}\mathrm{Pr}$ has been undertaken with the $^{117}\mathrm{Sn}$${(}^{19}$F,4n${)}^{132}$Pr reaction. Two distinct rotational structures showing both signature components have been established. One band, with no signature splitting, is built on a near-prolate \ensuremath{\pi}${h}_{11/2}$\ensuremath{\bigotimes}\ensuremath{\nu}${g}_{7/2}$ structure. The second band, with a small signature splitting, involves the \ensuremath{\pi}${h}_{11/2}$\ensuremath{\bigotimes}\ensuremath{\nu}${h}_{11/2}$ configuration with a triaxial shape. A comparison with recent results for the $^{130}\mathrm{La}$ isotone has been made. A third band structure of large signature splitting (doubly decoupled) was observed showing only one signature component. This band structure is believed to involve the \ensuremath{\beta}-driving \ensuremath{\nu}${i}_{13/2}$${[660](1/2}^{+}$ orbital.