Elastic scattering of ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ + ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ and ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ + ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ has been measured at $E\left({}_{}{}^7{}_{}{}^{}\mathrm{Li}\right)=34\mathrm{}$ MeV and $E\left({}_{}{}^6{}_{}{}^{}\mathrm{Li}\right)=30\mathrm{}$ MeV and the data have been described with the standard optical model. Both ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$(${}_{}{}^7{}_{}{}^{}\mathrm{Li}$,${}_{}{}^6{}_{}{}^{}\mathrm{He}$) and ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$(${}_{}{}^7{}_{}{}^{}\mathrm{Li}$,${}_{}{}^6{}_{}{}^{}\mathrm{Li}$) reaction data were measured. Extreme forward angle (${}_{}{}^7{}_{}{}^{}\mathrm{Li}$,${}_{}{}^6{}_{}{}^{}\mathrm{He}$) data were taken so that the $j$ transfer ($\frac{3}{2}$ or ½) to the first two $1^{+}$ states in ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ could be determined. Both states were found to be populated predominantly by $p_{\frac{1}{2}}$ transfers. The absolute spectroscopic factors obtained are in good agreement with 35 MeV (${}_{}{}^3{}_{}{}^{}\mathrm{He}$, $d$) data, but not with 17 MeV data. Comparison between the spectroscopic factors obtained from the ($d, n$), (${}_{}{}^3{}_{}{}^{}\mathrm{He}$, $d$), and (${}_{}{}^7{}_{}{}^{}\mathrm{Li}$,${}_{}{}^6{}_{}{}^{}\mathrm{He}$) reactions shows a clear need for the energy dependence of these reactions to be understood before reliable absolute spectroscopic factors for ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ can be obtained. The (${}_{}{}^7{}_{}{}^{}\mathrm{Li}$,${}_{}{}^6{}_{}{}^{}\mathrm{Li}$) results were in good agreement with the calculations of Cohen and Kurath, in contrast to the (${}_{}{}^7{}_{}{}^{}\mathrm{Li}$,${}_{}{}^6{}_{}{}^{}\mathrm{He}$) results.

NUCLEAR REACTIONS ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ + ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$, 34 MeV; ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ + ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$, 30 MeV; measured $\sigma \left(\theta \right)$; deduced optical model parameters. ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$(${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^6{}_{}{}^{}\mathrm{He}$)${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$, 34 MeV; measured $\sigma \left(\theta \right)$; deduced $j$ transfer; ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$(${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$)${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$, 34 MeV; measured $\sigma \left(\theta \right)$. Deduced $S\left({}_{}{}^{10}{}_{}{}^{}\mathrm{B}\right)$ and $S\left({}_{}{}^{10}{}_{}{}^{}\mathrm{Be}\right)$ from finite-range DWBA analysis.

• Received 20 December 1976

DOI:https://doi.org/10.1103/PhysRevC.15.1726