Pion Cloud and Nucleon Mass in Finite Nuclei

Details Pion Cloud and Nucleon Mass in Finite Nuclei Pion Cloud and Nucleon Mass in Finite Nuclei

2000-05-01

arxiv.org/abs/nucl-th/0005005v1

Physics

Nuclear Physics

Nuclear Theory

19 pages, 14 figures, revtex, epsf

Scientific paper

We study the mass of a nucleon in a nucleus using a model recently introduced for a nucleon current with a pion cloud component. The method of QCD sum rules is used to determine the mass shifts for nucleons to first order in nuclear density in oxygen-16 and calcium-40, with the pion propagator determined by an optical potential for pion-nucleus scattering. Mass shifts due to the pionic contributions range from negligible in oxygen to -100 MeV in calcium at central nuclear density, with larger shifts in the nuclear surface. The consistency of this model with chiral perturbation theory is demonstrated.

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