OPTICAL-MODEL ANALYSIS OF ELASTIC SCATTERING OF 3HE PARTICLES FROM 58NI AT 24.15,27.64 AND 34.14 MEV

The elastic scattering of 3He particles from 58Ni at 24.15, 27.64 and 34.14 MeV has been studied. The measurements were done at laboratory angles extending from 15° to 170° at 25° or 5° intervals. An optical-model analysis was carried out with an automatic search code. Both Wood-Saxon potential and derivative Wood-Saxon potential were applied to the imaginary part of the optical potential. The latter gave better fit than the former at backward angles when a spin-orbit coupling potential was not used. An analysis using the optical potential with Thomas type spin-orbit coupling was also carried out. The depth of spin-orbit coupling potential depends on the depth of the real potential and the different potentials that minimize χ2/N for the cross section give similar polarizations. Ambiguities in the optical-model parameters appear in all the present analyses. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.