Polarization correlation coefficients have been measured at RIKEN for the 3 He( d, p) 4 He reaction at intermediate energies (E d = 270 MeV). We propose a model for the ( d, p) reaction mechanism using the pd elastic scattering amplitude, which is rigorously determined with a Faddeev calculation and using modern NN forces. Our theoretical predictions for the deuteron polarization observables A y , A yy , A xx and A xz at E d = 140, 200 and 270 MeV are given. The A y observables agree qualitatively in shape with the new experimental data for the reaction 3 He( d, p) 4 He.

A cross section enhancement of the 3 − → He( − → d , p) 4 He fusion reaction in the 3/2 + resonance region is presented. It is pointed out that a residual interaction in a nuclear three-body system is generated by an atomic target with an electron-cloud, as is the case for atomic 3 He and the deuteron. A complete nuclear three-charged-particle Faddeev-type equation is derived for the first time in momentum space. Our formulation could be useful not only to investigate three-cluster systems with such a residual potential but also to obtain the astrophysical S-factor in the ultra low-energy region. The importance of a new renormalization amplitude is emphasized, which is missing in the previous renormalization method. * )

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Low-energy D(p,p)D elastic scattering using a rigorous Coulomb treatment in momentum space is considered. The treatment is an extension of an exact two-body Coulomb theory—different from the approximate method which is based on a screened Coulomb potential. In contrast to the latter, the two-body Coulomb potential employed is fully equivalent to the pure Coulomb potential in configuration space. It is shown that the approximation based on the Coulomb half-shell function ensures the reliability of the renormalization method. The difference between the rigorous treatment and the approximate method is demonstrated by numerical results.

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