Proton-Proton Final-State Interactions in the Reactions 3He(d,t)2 p, d(3He,t)2 p, p(3He,d)2 p, and 3He(3He,4He)2 p
The energy spectra of tritons, α particles, and deuterons from the reactions 3He(d,t)2 p, d(3He,t)2 p, 3He(3He,4He)2 p, and p(3He,d)2 p were measured at forward angles 0° to 5°, using 36-MeV deuterons and 53-MeV 3He from the Oak Ridge isochronous cyclotron. The reaction d(3He,t)2 p at 0° was also studied at 74 MeV. All spectra had peaks in the high-energy region which are attributed to the enhancement of the cross section due to the final-state interaction of the two protons. The final-state interaction theory of Watson and Migdat gives an adequate representation of the data for the reactions 3He(d,t)2 p and 3He(3He,4He)2 p for the known proton-proton interaction. For the other two reactions, d(3He,t)2 p and p(3He,d)2 p, the observed peaks are much narrower than the predictions of the Watson-Migdal theory. In the case of d(3He,t)2 p the narrower peak could be explained by assuming the primary reaction mechanism to be a charge-exchange process. A search for a three-proton enhancement in the reaction 3He(3He,t)3 p was unsuccessful.