The residual activity between bursts of a mechanically chopped beam has been used to measure the yield of the reaction ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}(p,\gamma ){}_{}{}^{33}{}_{}{}^{}\mathrm{Cl}$ systematically in the bombarding energy range $E_p=3.36\mathrm{} \mathrm{to} 5.41$ MeV. Two $T=\frac{3}{2}$ states in ${}_{}{}^{33}{}_{}{}^{}\mathrm{Cl}$ at $E_p=3.371\mathrm{}\pm 0.005$ MeV, $E_x=5.550\mathrm{}\pm .007$ MeV and at $E_p=5.282\mathrm{}\pm .006$ MeV, $E_x=7.402\mathrm{}\pm .008$ MeV have been located with the resonance strengths $\frac{\mathrm{}(2J+1)\mathrm{}{\Gamma }_{p_0}{\Gamma }_{\gamma }}{\Gamma }=0.76\mathrm{}\pm 0.18 \mathrm{and} 1.50\pm 0.37$ eV, respectively. Each of these resonances was narrower than the estimated 2-keV spread in the proton beam. These two states are interpreted as the analogs of the ground and the second excited state of ${}_{}{}^{33}{}_{}{}^{}\mathrm{P}$ with $J^{\pi }$ values ${\frac{1}{2}}^{+}$ and ${\frac{5}{2}}^{+}$, respectively. $\gamma$ decay of the lower resonance, investigated with a Ge(Li) detector, shows >88% and <12% branchings to the first excited state and ground state of ${}_{}{}^{33}{}_{}{}^{}\mathrm{Cl}$, respectively. The $M1\mathrm{}$ strengths of these transitions are compared with those obtained from $\beta$ analog transitions and with the theoretical predictions based on the many-particle shell-model calculations.

• Received 3 November 1971

DOI:https://doi.org/10.1103/PhysRevC.5.1270