The yield curve for proton capture on ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, leading to the region of the isospin-mixed pair of states at $E_x=16.63\mathrm{} \mathrm{and} 16.92$ MeV in ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$, has been measured as a function of bombarding energy from 4 to 30 MeV. A direct capture model provides a good description of the data.

NUCLEAR REACTIONS ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(p,\gamma ){}_{}{}^8{}_{}{}^{}\mathrm{Be}_{}^{*}{}_{}{}^{}\to 2\alpha$; measured $\sigma (E,\theta )$ leading to the 16.6-16.9-MeV states for $E_p=11.5\mathrm{} \mathrm{to} 30$ MeV by $\gamma$-ray detection. Measured $\sigma \mathrm{}\left(E\right)\mathrm{}$ for $E_p=4\mathrm{} \mathrm{to} 13$ MeV by detection of $2\alpha$. Natural target. Compared to direct capture model.

• Received 3 August 1981

DOI:https://doi.org/10.1103/PhysRevC.24.2378