The form of the spin-orbit potential for spin-1/2 particles
The spin-orbit part of the 3He optical model potential determined from the elastic scattering measurements including 3He polarization data for a range of nuclei, is characterized by a small diffuseness parameter within the range 0.2 ≤ aSO ≤ 0.4 fm for most nuclei. This recent finding for 3He is compared with the available triton (Los Alamos) and nucleon elastic scattering data, which are re-examined in terms of the conventional parametrization with derivative Woods-Saxon form of the spin-orbit potential. It is found that the neutron elastic scattering data are consistent with a spin-orbit potential with sharp surface localization, in contrast to the established proton and triton potentials, confirmed in the present analysis. The suggestion that the difference between the triton and 3He spin-orbit potential reflects a similar difference in the behaviour of protons and neutrons in the asymptotic region is admittedly based on the very scarce fast neutron elastic scattering polarization data available. It is shown how additional information may be obtained from study of (d,n) reactions, which are sensitive to the neutron spin-orbit potential geometry.
KeywordsElastic Scattering Polarization Data Optical Model Parameter DWBA Calculation Elastic Neutron Scattering
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- 3.Y.-W. Lui et al., to be published.Google Scholar
- 4.M.D. Cohler et al., J. Phys. G, 2 (1976) L151.Google Scholar
- 5.N.M. Clarke et al., unpublished; S. Roman, Proc. 4th Polarization Symposium, Zurich, 1975, p. 259.Google Scholar
- 6.J.F. Barnwell et al., to be published.Google Scholar
- 12.R. Sene et al., Proc. 3rd Polarization Symposium, Madison, 1971, p. 611, P.L. Beach et al., Phys. Rev. 156 (1967) 1201 (cross sections).Google Scholar