Elsevier

Physics Letters B

Volume 249, Issues 3–4, 25 October 1990, Pages 377-380
Physics Letters B

RPA ground state correlations in nuclei

https://doi.org/10.1016/0370-2693(90)91001-RGet rights and content

Abstract

Overcounting in the RPA theory of ground state correlations is shown to be avoided if exact rather than quasiboson commutators are used. Single particle occupation probabilities are formulated in a compact way by the RPA Green function. Calculations with large configuration spaces and realistic interactions are performed with 1p1h RPA and second RPA (SRPA) including 2p2h mixing in excited states. In 41Ca valence hole states are found to be quenched by about 10% in RPA and up to 18% in SRPA. Contributions from low and high lying excitations and their relation to long and short range correlations in finite nuclei are investigated.

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Part of this work was done during a stay of the authors at the Institut für Kernphysik, KFA Jülich. The hospitality and the support are gratefully acknowledged.

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