Study of the Level Structure ofTi47UsingTi46(n,γ)Reaction

The capture $\gamma$-ray spectrum resulting from thermal-neutron capture in ${}_{}{}^{46}{}_{}{}^{}\mathrm{Ti}$ has been measured using a 30-cc Ge(Li) detector. Some 19 new $\gamma$ lines corresponding to transitions between levels of ${}_{}{}^{47}{}_{}{}^{}\mathrm{Ti}$ were observed. The neutron separation energy of ${}_{}{}^{47}{}_{}{}^{}\mathrm{Ti}$ was found to be 8884±7 keV. Angular correlation measurements were carried out, using NaI(Tl) detectors, and the spins of the following levels in ${}_{}{}^{47}{}_{}{}^{}\mathrm{Ti}$ were obtained: $1.556 \left(\frac{3}{2}\right)$, $1.798 \left(\frac{3}{2}\right)$, $2.556 \left(\frac{3}{2}\right)$, $3.685 (\frac{1}{2} or \frac{3}{2})$, and 3.925 MeV ($\frac{3}{2}$ or ½). Some of these results disagree with those obtained by Lee and Schiffer, who established the spins according to the $J$-dependence rule for the angular distributions in ($d,p$) reactions. Some indication of a direct capture mechanism for the ($n,\gamma$) reaction process is presented. The role of the direct capture mechanism in the ${}_{}{}^6{}_{}{}^{}\mathrm{Ti}(n,\gamma )$ reaction is discussed.