Effect of Fermi Motion on the Generalized RIA Optical Potentials : Nuclear Physics

概要

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The effect of Fermi motion on the generalized relativistic impulse approximation (GRIA) optical potentials of Tjon and Wallace is investigated in a nuclear matter approach. The dependences of generalized NN t-matrix operator on the Fermi motion are mainly due to the ρ-spin projection operators, which produce density matrices in the ρ-spin space of target nucleon. The effect of the Fermi motion composes of two parts, the nonrelativistic and relativistic ones. The former reduces the strengths of the real scalar potentials at all the energies from 200 to 800 MeV through the correction to the positive-energy elements of the density matrices. The latter enhances the strengths through the positive to negative-energy coupling elements and the corrections to the negative-energy elements. These two effects are cancelled by each other more largely at higher energies. Thus, the total effect of the Fermi motion on the GRIA potentials is small except for the scalar potential at 200 MeV. This suggests the difference between the effects of the Fermi motion in the nonrelativistic and in the relativistic impulse optical potentials.
理論物理学刊行会の論文
1991-05-25