Independent particle motion and correlations in fermion systems

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Reviews of Modern Physics

DOI:https://doi.org/10.1103/RevModPhys.69.981· OSTI ID:532006

Pandharipande, V R ^[1]; Sick, I ^[2]; deWitt Huberts, P K ^[3]

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1. Department of Physics, University of Illinois, Urbana, Illinois 61801 (United States)
2. Department of Physics and Astronomy, Universitaet Basel, CH-4056 Basel (Switzerland)
3. NIKHEF-K, NL 1009AJ Amsterdam (The Netherlands)

The independent-particle model explains many features of atomic nuclei and other fermion systems. The low-energy states of nearly closed-shell systems can be interpreted as having {ital quasiparticles} in single-particle orbitals. The difference between physical particles and quasiparticles results from the effects of correlations in the system. In this Colloquium the authors consider the consequences of these correlations. They discuss in particular, mainly for the case of nuclei, the quasihole strength z (spectroscopic factor) that gives the probability of the quasiparticle{close_quote}s being a physical particle. Results from both theory and experiment indicate that z{approximately}0.65 and imply that only {approximately}2/3 of the time a nucleon acts as an independent particle bound in an average potential. The fraction of {approximately}1/3 of correlated nucleons is larger than believed in the past. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 532006
• Journal Information: Reviews of Modern Physics, Journal Name: Reviews of Modern Physics Journal Issue: 3 Vol. 69; ISSN 0034-6861; ISSN RMPHAT
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CORRELATIONS
ELECTRON REACTIONS
FERMIONS
FORM FACTORS
HARTREE-FOCK METHOD
INELASTIC SCATTERING
NUCLEAR MATTER
NUCLEAR STRUCTURE
PROBABILITY
QUASI PARTICLES
SHELL MODELS
SINGLE-PARTICLE MODEL
SPECTROSCOPIC FACTORS
TRANSFER REACTIONS