Nanosecond lifetimes of the low-spin states in the nucleus 147Nd : A particle-rotor model interpretation of the results

Abstract

Nanosecond lifetimes of several states in 147Nd have been studied using the reaction 146Nd(d, pγ) 147Nd with 10 MeV deuterons. The following lifetimes were observed: the 7 2 − level at 49.9 keV, 2.5±0.5 ns; the 5 2 − level at 127.9 keV, ≦ 0.8 ns; the 9 2 − level at 190.3 keV, 1.1±0.3 ns and the 1 2 − level at 214.6 keV, 5.8±0.8 ns. The wave functions of the states were constructed using an axial particle-plus-rotor model. The free parameters used are compared to the systematics observed in the neighbouring heavier N = 87 isotones as well as in the N = 89 and 91 isotones. Transition rates within the f 7 2 and h 9 2 based excitations, separately, are reasonably well reproduced, but the connecting transitions indicate too strong a mixing of the shells in the calculation.