Correlation effects on {lambda} propagation in nuclear matter

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.044301· OSTI ID:20695641

Robertson, N J; Dickhoff, W H ^[1]

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1. Department of Physics, Washington University, St. Louis, Missouri 63130 (United States)

The propagation of a {lambda} hyperon in nuclear matter is studied within the Green's function formalism. The probability density for adding a {lambda} hyperon with momentum k to the correlated nuclear matter ground state is obtained from the complete energy dependence of the real and imaginary parts of the {lambda} self-energy. This self-energy incorporates the effects of short-range correlations induced by the hyperon-nucleon interaction and the strong coupling between {lambda}N and {sigma}N states which is known to be crucial for a correct determination of the {lambda} binding energy. The calculated spectral functions and quasi-particle parameters for the {lambda} are found to be qualitatively similar to corresponding results for correlated nucleons. In general, the {lambda} is less strongly correlated with the nuclear matter environment at k{sub F}=1.36 fm{sup -1} than a nucleon, in agreement with empirical information from finite nuclei.

• OSTI ID: 20695641
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 70; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BINDING ENERGY
CORRELATIONS
DENSITY
ENERGY DEPENDENCE
GREEN FUNCTION
GROUND STATES
HYPERNUCLEI
LAMBDA BARYONS
NUCLEAR MATTER
NUCLEON-HYPERON INTERACTIONS
NUCLEONS
PROBABILITY
QUASI PARTICLES
SELF-ENERGY
SPECTRAL FUNCTIONS
STRONG-COUPLING MODEL