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Title: Modern optical potentials and the role of nuclear structure

Abstract

Microscopic descriptions of exotic nuclei are the subject of much experimental and theoretical effort. Not only are such important in their own right but are also necessary for applications in nuclear astrophysics. Evaluations of model wave functions may be done with analyses of elastic and inelastic scattering from hydrogen. Those require a realistic model of nucleon-nucleus scattering as scattering from hydrogen translates to proton scattering in the inverse kinematics. The Melbourne g-folding model for intermediate energy is presented along with various examples. Implications for existing and future experimental and theoretical work are discussed.

Authors:
 [1]
  1. School of Physics, University of Melbourne, Victoria, 3010 (Australia)
Publication Date:
OSTI Identifier:
20798541
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 831; Journal Issue: 1; Conference: International conference on frontiers in nuclear structure, astrophysics, and reactions - FINUSTAR, Isle of Kos (Greece), 12-17 Sep 2005; Other Information: DOI: 10.1063/1.2200934; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASTROPHYSICS; EVALUATION; FOLDING MODEL; HYDROGEN; INELASTIC SCATTERING; NUCLEAR POTENTIAL; NUCLEAR STRUCTURE; NUCLEI; OPTICAL MODELS; PROTON-NUCLEON INTERACTIONS; PROTONS; WAVE FUNCTIONS

Citation Formats

Karataglidis, S. Modern optical potentials and the role of nuclear structure. United States: N. p., 2006. Web. doi:10.1063/1.2200934.
Karataglidis, S. Modern optical potentials and the role of nuclear structure. United States. doi:10.1063/1.2200934.
Karataglidis, S. Wed . "Modern optical potentials and the role of nuclear structure". United States. doi:10.1063/1.2200934.
@article{osti_20798541,
title = {Modern optical potentials and the role of nuclear structure},
author = {Karataglidis, S.},
abstractNote = {Microscopic descriptions of exotic nuclei are the subject of much experimental and theoretical effort. Not only are such important in their own right but are also necessary for applications in nuclear astrophysics. Evaluations of model wave functions may be done with analyses of elastic and inelastic scattering from hydrogen. Those require a realistic model of nucleon-nucleus scattering as scattering from hydrogen translates to proton scattering in the inverse kinematics. The Melbourne g-folding model for intermediate energy is presented along with various examples. Implications for existing and future experimental and theoretical work are discussed.},
doi = {10.1063/1.2200934},
journal = {AIP Conference Proceedings},
number = 1,
volume = 831,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2006},
month = {Wed Apr 26 00:00:00 EDT 2006}
}
  • We study ground-state properties of the doubly magic nuclei {sup 4}He, {sup 16}O, and {sup 40}Ca employing the Goldstone expansion and using as input four different high-quality nucleon-nucleon (NN) potentials. The short-range repulsion of these potentials is renormalized by constructing a smooth low-momentum potential V{sub low-k}. This is used directly in a Hartree-Fock approach, and corrections up to third order in the Goldstone expansion are evaluated. Comparison of the results shows that they are only slightly dependent on the choice of the NN potential.
  • Lorentz scalar and four-vector optical potentials are obtained for protons elastically scattered from /sup 16/O, /sup 40/Ca, /sup 48/Ca, /sup 90/Zr, and /sup 208/Pb. It is demonstrated that Dirac optical potentials constrained by relativistic Hartree theory are capable of producing good agreement with experiment
  • Research Highlights: > The nuclear matter is studied within the Brueckner-Hartree-Fock (BHF) approach employing the most recent accurate nucleon-nucleon potentials. > The results come out by approximating the single particle self-consistent potential with a parabolic form. > We discuss the current status of the Coester line, i.e., density and energy of the various saturation points being strongly linearly correlated. > The nuclear symmetry energy is calculated as the difference between the binding energy of pure neutron matter and that of symmetric nuclear matter. - Abstract: The binding energy of nuclear matter at zero temperature in the Brueckner-Hartree-Fock approximation with modernmore » nucleon-nucleon potentials is studied. Both the standard and continuous choices of single particle energies are used. These modern nucleon-nucleon potentials fit the deuteron properties and are phase shifts equivalent. Comparison with other calculations is made. In addition we present results for the symmetry energy obtained with different potentials, which is of great importance in astrophysical calculation.« less
  • The {sup 1}S{sub 0} pairing in neutron matter is studied using realistic two- and three-nucleon interactions. The auxiliary field diffusion Monte Carlo method and correlated basis function theory are employed to get quantitative and reliable estimates of the gap. The two methods are in good agreement up to the maximum gap density and both point to a slight reduction with respect to the standard BCS value. In fact, the maximum gap is about 2.5 MeV at k{sub F}{approx}0.8 fm{sup -1} in BCS and 2.2-2.4 MeV at k{sub F}{approx}0.6 fm{sup -1} in correlated matter. In general, the computed medium polarization effectsmore » are much smaller than those previously estimated within all theories. Truncations of Argonne v{sub 8{sup '}} to simpler forms give the same gaps in BCS, provided the truncated potentials have been refitted to the same NN data set. The three-nucleon interaction provides an additional increase of the gap of about 0.35 MeV.« less
  • We determine the saturation properties of nuclear matter within the Brueckner-Hartree-Fock approach based on a large set of modern nucleon-nucleon potentials and confirm the validity of the Coester band. The improvement of the saturation point when including nuclear three-body forces is pointed out and comparison with the Dirac-Brueckner-Hartree-Fock results is made.