Model of multiple Dirac eikonal scattering of protons by nuclei

TL;DR

This paper develops a relativistic multiple scattering model for proton-nucleus elastic scattering using Dirac eikonal approximation, providing new amplitude expressions and comparing results with Glauber theory at 800 MeV.

Contribution

Introduces a novel Dirac eikonal multiple scattering model for proton-nucleus elastic scattering, with explicit amplitude formulas and application to calcium-40 and lead-208.

Findings

Model yields elastic scattering observables consistent with experimental data.

Comparison shows differences and similarities with Glauber theory results.

Provides insights into relativistic effects in high-energy proton-nucleus interactions.

Abstract

The model of multiple Dirac eikonal scattering of incident proton by target-nucleus nucleons is developed, in which new expressions for the elastic $pA$-scattering amplitudes are obtained from the multiple scattering Watson series with employing the eikonal approximation for the Dirac propagators of the free proton motion between successive scattering acts on nucleons. Basing on this model, calculations for the complete set of observables of the elastic $p+^{40}$Ca and $p+^{208}$Pb at 800 MeV have been performed with using proton-nucleon amplitudes determined from the phase analysis and the nucleon densities obtained from describing the target-nucleus structure in the relativistic mean-field approximation. A comparison has been made of the results of these calculations with analogous calculations on the basis of the Glauber multiple diffraction theory.