Total cross sections and resonance yields have been measured for the ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(α,n${)}^{14}$N reaction for ${\mathit{E}}_{\mathrm{\alpha }}$=350–2400 keV, and for the ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$(p,n${)}^{14}$N reaction for ${\mathit{E}}_{\mathit{p}}$=1000–1550 keV, using 4π neutron detectors. Differential cross sections for the ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(α,p${)}^{14}$C reaction were measured for ${\mathit{E}}_{\mathrm{\alpha }}$=600–1820 keV. A strong and narrow (Γ=2.2 eV) new resonance was found at ${\mathit{E}}_{\mathrm{\alpha }}$=606 keV, with ${\mathit{J}}^{\mathrm{\pi }}$=7/$2^{\mathrm{-}}$ established by (α,γ) and (α,p) angular distributions. This resonance dominates the thermonuclear (α,n) and (α,p) reaction rates for T∼0.5×${10}^9$ K. The ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(α,n), (α,p), and (α,γ) reaction rates versus temperature are presented and compared with ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(n,γ) rates.

• Received 4 September 1990

DOI:https://doi.org/10.1103/PhysRevC.43.883