DIRECT-REACTION AND ISOSPIN SYMMETRIES IN D-] AND D REACTIONS

We have measured angular distributions of the analyzing powers Ay, Axx, Ayy, and Axz for the H2(d→,p)H3 reaction at deuteron lab energies Ed of 13.39 and 17.00 MeV. These distributions do not show the symmetry or antisymmetry about 90°(c.m.) expected on the basis of a simple direct-neutron-transfer reaction mechanism. In a companion experiment, we have measured the same four analyzing powers for both the H2(d→,p)H3 reaction and its charge-symmetric partner H2(d→,n)He3 at Ed=15.50 and 17.00 MeV in a restricted angular range. These latter data were obtained by simultaneously detecting the tritons and helions. Only small differences were observed in the respective analyzing powers for the two reactions, which suggests a weakening of the mechanism responsible for the larger differences found by others at lower energies. NUCLEAR REACTIONS H2(d→,p), E=13.39, 17.00 MeV; measured Ay(θ), Axx(θ), Ayy(θ), Axz(θ), H2(d→,p), (d→,n) simultaneously, E=15.50, 17.00 MeV; measured Ay(θ), Axx(θ), Ayy(θ), Axz(θ). © 1979 The American Physical Society.