Proton-3He elastic scattering: A phase-shift analysis by a separable potential model |
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Authors: | L Beltramin R del Frate G Pisent |
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Institution: | Dipartimento di Fisica dell'' Università di Padova, Sezione di Padova dell''Istituto Nazionale di Fisica Nucleare, Padova, Italy |
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Abstract: | All the available experimental data (cross sections, projectile and target polarizations, polarization transfer coefficients) on p-3He elastic scattering up to ~10 MeV are analyzed on a unified basis in the framework of a separable potential model. This allows a phase-shift analysis which is model dependent, but is averaged over a wide energy interval (757 experimental points are reproduced by 27 model parameters). The calculations confirm some indications, already present in the literature, of a weak S-D tensor mixing, and strong singlet-triplet mixing in the P-states. Our conclusions are that probably the leading non-central effect is given by the coupling s1 · l between the incident proton spin s1 and the orbital angular momentum of relative motion. Finally, the phase shifts and observables are recalculated using the p-3He potential parameters, but switching off the Coulomb interaction. The results are compared with the (few) n-3H experimental cross sections of the literature, and the agreement is good, as expected on the basis of the charge-symmetry law. |
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