Angular distributions of elastic scattering and polarization from 0 = 30 to 120°, have been obtained for Al, Si, Fe, and Co at E n = 1.95=b0.09 MeV, using polarized neutrons from the T(p,n)H.e 3 reaction. Scattering and polarization from the 0.845-MeV level of Fe 56 were also measured; an isotropic angular distribution and zero polarization were found for this level. The angular distributions of the elastic polarization for Si, Fe, and Co were negative at forward and backward angles with two zero cross-over points; the first zero of the polarization occurs approximately at the minimum of the elastic scattering for these three elements. In distinct contrast, the angular distribution of the polarization for Al is positive and constant at forward angles, becoming negative at backward angles. Absolute cross sections were obtained by scattering from polyethylene and an optical-model analysis of the experimental results was made. ! 1 t \ | \ J \
calculations, however, occurs in the prediction of the energy levels of the different states. The Serber force calculation gives energy spectra of the 1~, T= 1 states in essential agreement with experiment using a strength parameter equal to that for the free nucleon-nucleon interaction. On the other hand for the zero-range force we must use an interaction strength two to three times smaller than the free-particle strength in order to obtain reasonable agreement with the experimental spectrum of oxygen 16. As shown in Ref. 14, this weakening of the interaction is obtained mainly by using the Serber exchange-force mixture, which has no contribution in relative odd angular-momentum states.
Angular distributions for the scattering of 29 MeV
3
He-particles by light nuclei have been observed using a photographic plate method. Absolute differential cross-sections for elastic scattering, and for inelastic processes for
2
H,
3
He and
4
He nuclei, are given within the centre-of-mass angular range 20 to 150°. The elastic scattering distributions for the
1
H and
3
He nuclei have been compared with predictions based on resonating group theory.
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