The ${}_{}{}^4{}_{}{}^{}\mathrm{He}$(α${,}^3$He${)}^5$He(g.s.) reaction was studied at incident laboratory energies of 158 and 200 MeV for c.m. scattering angles ranging from ∼16° to 100°. The shape of the ${}_{}{}^5{}_{}{}^{}\mathrm{He}$(g.s.) peak in the measured ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ energy spectra is well reproduced by distorted-wave Born approximation calculations. Whereas calculations utilizing six-parameter optical potentials yield good qualitative agreement with the measured angular distributions, unacceptably poor agreement is found when nine-parameter potentials are utilized. Absolute normalization with ${\mathit{D}}_0^2$ strengths extracted from corresponding zero-range and finite-range calculations overpredicts the measurements by factors of ∼2 to 3. © 1996 The American Physical Society.

• Received 9 May 1996

DOI:https://doi.org/10.1103/PhysRevC.54.2485