The reaction ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}(\mathrm{p}, \gamma ){}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ has been investigated in the energy range $E_{\mathrm{p}}=0.07-2.20\mathrm{}$ MeV. The broad resonant structure previously observed in the ground state transition near $E_{\mathrm{p}}=1.2\mathrm{}$ MeV has been seen also in $\gamma$-ray transitions to excited states. The observed excitation functions as well as the $\gamma$-ray angular distributions can be explained by assuming several broad overlapping resonances. The low-energy data ($E_{\mathrm{p}}<0.6\mathrm{}$ MeV) reveal the existence of two $s$-wave resonances at $E_{\mathrm{p}}=0.010\mathrm{} \mathrm{and} 0.56$ MeV. Spectroscopic factors for several final states have been obtained from observation of direct capture processes to them; they are in fair agreement with results from stripping reaction studies. The present data also provide information on partial and total widths of the states at $E_x=8-9\mathrm{}$ MeV. The energy range investigated corresponds to the temperature range of $T=(0.01-5)\mathrm{}\times {10}^9$ K. The thermonuclear reaction rates deduced from the present results are compared with previously reported values.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}(\mathrm{p}, \gamma )$, $E_{\mathrm{p}}=0.07-2.20\mathrm{}$ MeV; measured $\gamma$ yield for ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ states up to $E_x=10.7\mathrm{}$ MeV. Deduced resonance parameters, branching ratios, and direct capture contributions for proton-unbound states; deduced spectroscopic factors, $\frac{{\Gamma }_{\gamma }}{{\Gamma }_{\mathrm{tot}}}$, and ${\Gamma }_{\mathrm{tot}}$ for several $\alpha$-unbound states. Calculated thermonuclear reaction rate for $T=(0.01-5)\mathrm{}\times {10}^9$ K.

• Received 12 May 1983

DOI:https://doi.org/10.1103/PhysRevC.28.1431