Nuclear structure of 159Tb, 161Tb and 163Tb studied with the (t, α) reaction

The 160Dy(t, α)159Tb, 162Dy(t, α)161Tb, and 164Dy(t, α)163Tb reactions have been studied using a 17 MeV triton beam from the McMaster University Tandem Accelerator. The α-spectra were analyzed with a magnetic spectrograph and the resolution obtained in the best spectra was 16–19 keV FWHM (full-width half maximum). Transferred l-values were determined by comparing the measured angular distributions with distorted-wave Born-approximation predictions. The results were interpreted in terms of the Nilsson model with pairing and Coriolis-mixing effects included. Prior to these experiments the only information available on excited states of 163Tb was from an unpublished (d, 3He) experiment. Now several rotational bands based on single-proton Nilsson states have been assigned. The 32+[411], 12+[411], 52−[532], 72−[532], 52+[413], 12+[420] and 32−[541] bands have been observed.