The ($\alpha$, ${}_{}{}^6{}_{}{}^{}\mathrm{He}$) reaction on ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ has been studied at $E_{\alpha }=58\mathrm{}$ MeV. Although the cross sections are much smaller than the corresponding ($p, t$) cross sections by about a factor of 20, the angular distributions are characteristic of a direct transfer mechanism and are reproduced satisfactorily by distorted-wave theory assuming $\mathrm{LS}$ coupling in ${}_{}{}^6{}_{}{}^{}\mathrm{He}$.

NUCLEAR REACTIONS: ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(\alpha , {}_{}{}^6{}_{}{}^{}\mathrm{He})$ and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}(\alpha , {}_{}{}^6{}_{}{}^{}\mathrm{He})$, $E=58\mathrm{}$ MeV; measured $\sigma (E_{{}_{}{}^6{}_{}{}^{}\mathrm{He}}, \theta )$; ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ deduced transition strengths and DWBA normalization.

• Received 11 November 1974

DOI:https://doi.org/10.1103/PhysRevC.11.734