OBSERVATION OF P-WAVE CAPTURE STRENGTH IN THE H-2((D)OVER-RIGHT-ARROW, GAMMA)HE-4 REACTION AT E(D)=80-0 KEV

The H-2(d over arrow pointing right, gamma)He-4 reaction has been stud ied using tensor polarized deuterons having an incident energy of E(d) (lab)=80 keV, which were stopped in the target. The angular distributi ons of the cross section sigma(theta)/A0, vector analyzing power A(y)( theta), and tensor analyzing power A(yy)(theta) were measured and were interpreted using a model independent transition-matrix element analy sis. These results lead to the conclusion that over 50% of the cross s ection strength at these low energies is due to p-wave E1 and M2 captu re, in sharp contrast to previous assumptions of dominant s-wave E2 ca pture.