Polarized deuteron capture by 3He and 3H at and above the fusion resonance region.

The absolute differential cross sections and vector and tensor analyzing powers for the [sup 3]He([ital [rvec d]],[gamma])[sup 5]Li and [sup 3]H([ital [rvec d]],[gamma])[sup 5]He reactions have been measured both in the [ital j][sup [pi]]=3/2[sup +] fusion resonance region [[ital E][sub [ital d]](lab)=0.45 MeV and [ital E][sub [ital d]](lab) = 0.1 MeV, respectively] and at [ital E][sub [ital d]](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 [ital s]-wave ([ital E]1) capture, with small admixtures of [ital M]1 or [ital E]2 radiation. One solution for each reaction is dominated by a large ([similar to]90%) [sup 4][ital s][sub 3/2]([ital E]1) capture strength. Coupled-channels resonating group model (CCRGM) calculations have been performed which favor these solutions. In the CCRGM picture, the [ital j][sup [pi]]=3/2[sup +] fusion resonance in the capture cross section is a consequence of the tensor force, which couples the [ital s]=3/2, [ital d]+[sup 3]He (or [ital d]+[sup 3]H) channel to the [ital s]=1/2, [ital p]+[sup 4]He (or [ital n]+[sup 4]He) channel, enabling the reactions to proceed via the spin-independent ([ital E]1) transition tomore » the ground state. At [ital E][sub [ital d]](lab)=8.6 MeV, a TME analysis of the [sup 3]He([ital [rvec d]],[gamma])[sup 5]Li reaction yields a single solution which has [gt]80% [ital s]-wave ([ital E]1) capture strength, whereas two TME solutions exist for the [sup 3]H([ital [rvec d]],[gamma])[sup 5]He reaction with 45% and 65% [ital s]-wave ([ital E]1) capture strength. These data are also compared to the results of the CCRGM calculations.« less