Correlated nucleon motion and fractional occupation of orbitals in 208Pb

The low-energy states of nearly closed-shell nuclei can be interpreted as having quasi-particles in single-particle orbitals. The difference between physical particle and quasi particle, resulting from correlations, is quantified by the quasi-hole strength z that represents the probability of the qu...

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Published in:Nuclear physics. A 1999-03, Vol.649 (1), p.3-13
Main Author: de Witt Huberts, Peter K.A.
Format: Article
Language:English
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Summary:The low-energy states of nearly closed-shell nuclei can be interpreted as having quasi-particles in single-particle orbitals. The difference between physical particle and quasi particle, resulting from correlations, is quantified by the quasi-hole strength z that represents the probability of the quasi-particle being a physical particle. We present empirical evidence from quasi-free proton knockout with electrons for a substantially quenched z-value for the 3s orbital in 208 Pb. With z values derived from (e,e′p) and elastic electron-scattering data the absolute occupation for the 3s orbital in 208 Pb is derived. Results from both theory and experiment imply that only ∼ 2 3 of the nucleons act as independent particles bound in an average potential.
ISSN:0375-9474
DOI:10.1016/S0375-9474(99)00031-7