Polarized deuteron capture by He3 and H3 at and above the fusion resonance region
The absolute differential cross sections and vector and tensor analyzing powers for the He3(d,)5Li and H3(d,)5He reactions have been measured both in the j=3/2+ fusion resonance region [Ed(lab)=0.45 MeV and Ed(lab) = 0.1 MeV, respectively] and at Ed(lab)=8.6 MeV for several angles. In the fusion resonance region, a transition matrix element (TME) analysis of the observables leads to multiple solutions for both reactions, all of which indicate that the reactions proceed predominantly through s-wave (E1) capture, with small admixtures of M1 or E2 radiation. One solution for each reaction is dominated by a large (90%) 4s3/2(E1) capture strength. Coupled-channels resonating group model (CCRGM) calculations have been performed which favor these solutions. In the CCRGM picture, the j=3/2+ fusion resonance in the capture cross section is a consequence of the tensor force, which couples the s=3/2, d+3He (or d+3H) channel to the s=1/2, p+4He (or n+4He) channel, enabling the reactions to proceed via the spin-independent (E1) transition to the ground state. At Ed(lab)=8.6 MeV, a TME analysis of the He3(d,)5Li reaction yields a single solution which has >80% s-wave (E1) capture strength, whereas two TME solutions exist for the H3(d,)5He reaction with 45% and 65% s-wave (E1) capture strength. These data are also compared to the results of the CCRGM calculations. © 1994 The American Physical Society.
Balbes, MJ; Riley, JC; Feldman, G; Weller, HR; Tilley, DR
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