Momentum-space treatment of Coulomb distortions in a multiple-scattering expansion

C. R. Chinn, Ch. Elster, and R. M. Thaler
Phys. Rev. C 44, 1569 – Published 1 October 1991
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Abstract

The momentum-space treatment of the Coulomb interaction within the framework of the Watson multiple-scattering expansion is derived and tested numerically. By neglecting virtual Coulomb excitations and higher-order terms, the lowest-order optical potential for proton-nucleus scattering is shown to be the sum of the convolutions of a two-body nucleon-nucleon t matrix with the nuclear density and the point Coulomb interaction with the nuclear charge density. The calculation of the optical potential, as well as the treatment of the Coulomb interaction, is performed entirely in momentum space in an exact and numerically stable procedure. Elastic-scattering observables are presented for O16, Ca40, and Pb208 at energies up to 500 MeV. Comparisons are made with approximate treatments of the Coulomb interaction. The interference of nonlocality effects in the nuclear optical potential with different treatments of the Coulomb interaction is investigated.

  • Received 13 May 1991

DOI:https://doi.org/10.1103/PhysRevC.44.1569

©1991 American Physical Society

Authors & Affiliations

C. R. Chinn

  • Physics Department, Lawrence Livermore National Laboratory, Livermore, California 94550

Ch. Elster

  • Department of Physics, Ohio State University, Columbus, Ohio 43210

R. M. Thaler

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545
  • Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106

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Vol. 44, Iss. 4 — October 1991

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