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

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 $\text{7}\text{2}{}^{\mathrm{?}}$ level at 49.9 keV, 2.5±0.5 ns; the $\text{5}\text{2}{}^{\mathrm{?}}$ level at 127.9 keV, ≦ 0.8 ns; the $\text{9}\text{2}{}^{\mathrm{?}}$ level at 190.3 keV, 1.1±0.3 ns and the $\text{1}\text{2}{}^{\mathrm{?}}$ 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 $\text{f}{}_{\mathrm{<mtext>7</mtext><mtext>2</mtext>}}$ and $\text{h}{}_{\mathrm{<mtext>9</mtext><mtext>2</mtext>}}$ based excitations, separately, are reasonably well reproduced, but the connecting transitions indicate too strong a mixing of the shells in the calculation.