Rotational bands in the doubly odd N = 73 nucleus 134Pm

Abstract

The band structure of the doubly odd nucleus 134Pm has been investigated via the 92Mo( 46Ti, 3pn) 134Pm and 64Zn( 74Se, 3pn) 134Pm reactions at beam energies of 210 and 290 MeV, respectively. Two rotational structures showing both signature components have been established. One of these bands has minimal signature splitting and is thought to be built on the π[413] 5 2 +⊗ v h 11 2 configuration. The second band has a small signature splitting and is consistent with a π h 11 2 ⊗ v h 11 2 configuration. A third doubly decoupled band has also been observed. Quadrupole moment measurements for this band show that it has a deformation of β 2 ≈ 0.29. This band is interpreted as being based on a π h 11 2 ⊗ v h 9 2 configuration. The results are compared with the data from the neighbouring odd-odd N= 73 isotones 130La and 132Pr and with cranked shell model and total routhian surface calculations.