Elastic nucleon-nucleus scattering as a direct probe of correlations beyond the independent-particle model

Abstract

Employing a recently-developed dispersive optical model (DOM) which allows a complete description of experimental data both above (up to 200 MeV) and below the Fermi energy in ${}^{40}$Ca, we demonstrate that elastic nucleon-nucleus scattering data constrain the spectral strength in the continuum of orbits that are nominally bound in the independent-particle model. In the energy domain between 0 and 200 MeV, the integrated strength or depletion number is highly sensitive to the separation of the IPM orbit to the scattering continuum. This sensitivity is determined by the influence of the surface-absorption properties of the DOM self-energy. For an ab initio calculation employing the self-energy of the charge-dependent Bonn (CDBonn) interaction which only includes the effect of short-range correlations, no such sensitivity is obtained and a depletion of 4% is predicted between 0 and 200 MeV irrespective of the orbit. The ab initio spectral strength generated with the CDBonn interaction approaches the empirical DOM spectral strength at 200 MeV. Both spectral distributions allow for an additional 3-5% of the strength at even higher energies which is associated with the influence of short-range correlations. We suggest that the non-local form of the DOM allows for an analysis of elastic-nucleon-scattering data that directly determines the depletion of bound orbits. While obviously relevant for the analysis of elastic nucleon scattering on stable targets, this conclusion holds equally well for experiments involving rare isotopes in inverse kinematics as well as experiments with electrons on atoms or molecules.

arXiv comment5 pages, 3 figures, submitted to Physical Review Letters

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Cited by in corpus (13)

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• Recent developments for the optical model of nuclei
• Nuclear Dynamics and Reactions in the Ab Initio Symmetry-Adapted Framework
• The neutron skin thickness of ${}^{48}$Ca from a nonlocal-dispersive-optical-model analysis
• A dispersive optical model analysis of ${}^{208}$Pb generating a neutron-skin prediction beyond the mean field
• Validity of the distorted-wave impulse-approximation description of ${}^{40}$Ca$(e,e^{\prime }p{)}^{39}$K data using only ingredients from a nonlocal dispersive optical model
• Investigating the link between proton reaction cross sections and the quenching of proton spectroscopic factors in ${}^{48}$Ca
• Single-particle spectral function of the $\Lambda$ hyperon in finite nuclei
• Dispersive optical model description of nucleon scattering on Pb-Bi isotopes
• Renormalization group evolution of optical potentials: explorations using a toy model
• A further update on possible crises in nuclear-matter theory
• Forging the Link between Nuclear Reactions and Nuclear Structure
• Combining nuclear reactions and structure with the dispersive optical model