The contribution of the heavy particle stripping mechanism to the elastic scattering of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ on ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ is calculated using a modified distorted-wave Born approximation approach. The resulting amplitude is combined with a conventional optical potential amplitude and the calculated cross sections are compared with measurements at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=60\mathrm{} \mathrm{and} 113$ MeV. It is found that the heavy particle stripping mechanism produces most of the observed cross sections backward of ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}=100\mathrm{}°$ and that it has very little effect on forward cross sections.

NUCLEAR REACTIONS ${}_{}{}^4{}_{}{}^{}\mathrm{He}$(${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$)${}_{}{}^4{}_{}{}^{}\mathrm{He}$, $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=60.2\mathrm{} \mathrm{and} 113.1$ MeV; calculation of heavy particle stripping contribution; Optical model and DWBA.

• Received 14 January 1981

DOI:https://doi.org/10.1103/PhysRevC.23.2361