Nuclear Levels inTh233Excited by Neutron Capture and (d, p) Reactions

Low-energy $\gamma$ rays of the reaction ${}_{}{}^{232}{}_{}{}^{}\mathrm{Th}(n, \gamma ){}_{}{}^{233}{}_{}{}^{}\mathrm{Th}$ have been measured with the Risö bentcrystal spectrometer and with a Ge(Li) spectrometer at Munich. High-energy neutron-capture $\gamma$ rays from four low-energy neutron resonances have been investigated at the fastchopper facility at Brookhaven. Data on the reaction ${}_{}{}^{232}{}_{}{}^{}\mathrm{Th}(d, p){}_{}{}^{233}{}_{}{}^{}\mathrm{Th}$ were taken with an Enge split-pole magnetic spectrograph at the tandem Van de Graaff accelerator at Argonne. The combination of these data resulted in a level scheme of ${}_{}{}^{233}{}_{}{}^{}\mathrm{Th}$. Seven Nilsson configurations have been assigned to rotational bands, two of them tentatively. Spectroscopic factors have been calculated with ${\epsilon }_4$ deformation and Coriolis mixing, and compared with the experiment. The neutron binding energy in ${}_{}{}^{233}{}_{}{}^{}\mathrm{Th}$ has been determined to be 4786.5±2.0 keV.