Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis

Neutron elastic-scattering angular distributions were measured at beam energies of 11.9 and 16.9 MeV on {sup 40,48}Ca targets. These data plus other elastic-scattering measurements, total and reaction cross-sections measurements, (e,e{sup '}p) data, and single-particle energies for magic and do...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2011-06, Vol.83 (6)
Main Authors: Mueller, J. M., Shane, R., Waldecker, S. J., Dickhoff, W. H., Charity, R. J., Sobotka, L. G., Department of Chemistry, Washington University, St. Louis, Missouri 63130, Crowell, A. S., Esterline, J. H., Fallin, B., Howell, C. R., Westerfeldt, C., Youngs, M., Crowe, B. J. III, Pedroni, R. S.
Format: Article
Language:English
Subjects:
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
ASYMMETRY
BARYONS
CALCIUM 40
CALCIUM 48
CALCIUM ISOTOPES
CONFIGURATION
CORRELATIONS
CROSS SECTIONS
DIMENSIONLESS NUMBERS
DISTRIBUTION
ELASTIC SCATTERING
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIGHT NUCLEI
MAGIC NUCLEI
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEI
NUCLEONS
OPTICAL MODELS
PARTICLES
POTENTIALS
PROBABILITY
PROTONS
SCATTERING
SELF-ENERGY
SPECTROSCOPIC FACTORS
SPHERICAL CONFIGURATION
STABILITY
STABLE ISOTOPES
SURFACE POTENTIAL
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Summary:Neutron elastic-scattering angular distributions were measured at beam energies of 11.9 and 16.9 MeV on {sup 40,48}Ca targets. These data plus other elastic-scattering measurements, total and reaction cross-sections measurements, (e,e{sup '}p) data, and single-particle energies for magic and doubly magic nuclei have been analyzed in the dispersive optical-model (DOM), generating nucleon self-energies (optical-model potentials) that can be related, via the many-body Dyson equation, to spectroscopic factors and occupation probabilities. It is found that, for stable nuclei with N{>=}Z, the imaginary surface potential for protons exhibits a strong dependence on the neutron-proton asymmetry. This result leads to a more modest dependence of the spectroscopic factors on asymmetry. The measured data and the DOM analysis of all considered nuclei clearly demonstrate that the neutron imaginary surface potential displays very little dependence on the neutron-proton asymmetry for nuclei near stability (N{>=}Z).
ISSN:0556-2813
1089-490X
DOI:10.1103/PHYSREVC.83.064605