The excited states of ${}_{}{}^{203,205}{}_{}{}^{}\mathrm{Tl}$ were studied using the ${}_{}{}^{203,205}{}_{}{}^{}\mathrm{Tl}(n, n^{\prime }\gamma )$ reactions. $\gamma$-ray angular distributions were measured and spin assignments were made for excited states in both nuclei. An intermediate coupling model calculation was performed in which these nuclei were represented by the coupling of a single hole in the $3s_{\frac{1}{2}}$, $2d_{\frac{3}{2}}$, $2d_{\frac{5}{2}}$, and $1g_{\frac{7}{2}}$ proton shells to the quadrupole vibrations of the appropriate Pb core. The results of these calculations were compared with the experimental results of this and previous works.

NUCLEAR REACTIONS ${}_{}{}^{203,205}{}_{}{}^{}\mathrm{Tl}(n, n^{\prime }\gamma )$, $E=1.03-2.26\mathrm{}$ MeV; measured $E_{\gamma }$, $\sigma (E_{\gamma }, {\theta }_{\gamma })$; ${}_{}{}^{203,205}{}_{}{}^{}\mathrm{Tl}$ deduced levels, $J$, $\pi$, $\delta$. Intermediate coupling model calculation. Enriched and natural targets. Ge(Li) detectors.

• Received 16 September 1976

DOI:https://doi.org/10.1103/PhysRevC.15.635