$\alpha$-particle specific distortion effects in the $\alpha +\alpha$ system are examined by the addition of square-integrable distortion functions into the usual resonating-group formulation. The results indicate that such effects are not too important and can be neglected in calculations on other light nuclear systems.

NUCLEAR REACTIONS (${}_{}{}^4{}_{}{}^{}\mathrm{He}(\alpha ,\alpha )$), $E=0\mathrm{}-20$ MeV; calculated phase shifts. Resonating-group method with specific distortion effects.

• Received 22 May 1974

DOI:https://doi.org/10.1103/PhysRevC.10.987