Microscopic optical potential from the relativistic Brueckner-Hartree-Fock theory I. proton-nucleus scattering
arxiv(2024)
摘要
A relativistic microscopic optical model potential for nucleon-nucleus
scattering is developed based on the ab initio relativistic
Brueckner-Hartree-Fock (RBHF) theory with the improved local density
approximation, which is abbreviated as the RBOM potential. Both real and
imaginary parts of the single-particle potentials in symmetric and asymmetric
nuclear matter at various densities are determined uniquely in the full Dirac
space. The density distributions of the target nuclei are calculated by the
covariant energy density functional theory with the density functional PC-PK1.
The central and spin-orbit terms of the optical potentials are quantitatively
consistent with the relativistic phenomenological optical potentials. The
performance of the RBOM potential is evaluated by considering proton scattering
with incident energy E≤ 200 MeV on five target nuclei,
208Pb, 120Sn,
90Zr, 48Ca, and
40Ca. Scattering observables including the elastic
scattering angular distributions, analyzing powers, spin rotation functions,
and reaction cross sections are analyzed. Theoretical predictions show good
agreements with the experimental data and the results derived from
phenomenological optical potentials. We anticipate that the RBOM potential can
provide reference for other phenomenological and microscopic optical model
potentials, as well as reliable descriptions for nucleon scattering on exotic
nuclei in the era of rare-isotope beams.
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