A phenomenological, imaginary potential is incorporated into resonating-group calculations for the $p+\alpha$ system. The introduction of this potential allows, at energies above the reaction threshold of 18.35 MeV (c.m.), a more detailed comparison with experiment than was possible with previous resonating-group calculations. The calculations are compared with elastic scattering differential-cross-section data, polarization data, and spin-rotation-parameter data which exist between 23 and 75 MeV (c.m.). From this comparison it is concluded that a Majorana component whose strength varies with energy is very likely present in the imaginary potential.

• Received 3 February 1972

DOI:https://doi.org/10.1103/PhysRevC.5.1939