SINGLE-NUCLEON TRANSFER TO UNBOUND STATES BY MEANS OF THE HE-4(ALPHA,HE-3)HE-5 REACTION AT 158 AND 200 MEV

The He-4(alpha,He-3)He-5(g.s.) reaction was studied at incident labora tory energies of 158 and 200 MeV for c.m. scattering angles ranging fr om similar to 16 degrees to 100 degrees. The shape of the He-5(g.s.) p eak in the measured He-3 energy spectra is well reproduced by distorte d-wave Born approximation calculations. Whereas calculations utilizing six-parameter optical potentials yield good qualitative agreement wit h the measured angular distributions, unacceptably poor agreement is f ound when nine-parameter potentials are utilized. Absolute normalizati on with D-0(2) strengths extracted from corresponding zero-range and f inite-range calculations overpredicts the measurements by factors of s imilar to 2 to 3.