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Independent particle motion and correlations in fermion systems

Vijay R. Pandharipande, Ingo Sick, and Peter K. A. deWitt Huberts

Vijay R. Pandharipande

  • Department of Physics, University of Illinois, Urbana, Illinois 61801

Ingo Sick

  • Department of Physics and Astronomy, Universität Basel, CH-4056 Basel, Switzerland

Peter K. A. deWitt Huberts

  • NIKHEF-K, NL 1009AJ Amsterdam, The Netherlands

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Rev. Mod. Phys. 69, 981 – Published 1 July, 1997

DOI: https://doi.org/10.1103/RevModPhys.69.981

Abstract

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 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’s being a physical particle. Results from both theory and experiment indicate that z∼0.65 and imply that only ∼2/3 of the time a nucleon acts as an independent particle bound in an average potential. The fraction of ∼1/3 of correlated nucleons is larger than believed in the past.

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Rev. Mod. Phys. 69, 981– Published 1 July, 1997

    © 1997 American Physical Society

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