Proton-nucleus total cross sections in the intermediate energy range

L. Ray
Phys. Rev. C 20, 1857 – Published 1 November 1979
PDFExport Citation

Abstract

Proton-nucleus total and reaction cross sections are computed for a number of target nuclei at energies ranging from 100 to 2200 MeV using the Kerman, McManus, and Thaler optical potential formalism and the impulse approximation. Corrections due to Pauli, short-range dynamical, and center-of-mass correlations are included in the calculations. In addition, the electric form factor of the neutron and the nucleon magnetic moments are included in deriving the necessary proton densities from available empirical charge distributions. The proton-nucleon scattering amplitudes are obtained from phase shift solutions or directly from the published NN data. The proton and neutron point densities are deduced where possible from analyses of electron and proton scattering or from Hartree-Fock predictions if the appropriate elastic angular distribution data are unavailable. An estimate of the uncertainty in the calculated total cross sections is given. The total and reaction cross sections computed in this way are shown to be in very good agreement with the data above 400 MeV but overestimate the data by 15-25% at lower energies, indicating that the approximate multiple scattering calculations generally performed near 1 GeV are inadequate when applied at energies below 400 MeV. Several theoretical improvements are suggested for this lower energy range and some numerical estimates are given. Analysis of total cross section data is also shown to be an unsuitable method for obtaining accurate measurements of neutron matter densities.

NUCLEAR REACTIONS proton-nucleus scattering; total and reaction cross sections; Ep=100 to 2200 MeV; targets C12, O16, A127, Fe56, Cu63,65, Ge72,74, I127, and Pb208; Kerman, McManus, and Thaler optical potential; target nucleon correlations.

  • Received 16 April 1979

DOI:https://doi.org/10.1103/PhysRevC.20.1857

©1979 American Physical Society

Authors & Affiliations

L. Ray

  • Theoretical Division, Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87545

References (Subscription Required)

Click to Expand
Issue

Vol. 20, Iss. 5 — November 1979

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×