The Two-Pion Exchange NN-Potential in Nuclear Matter and Nuclear Stability

Details The Two-Pion Exchange NN-Potential in Nuclear Matter and Nuclear Stability The Two-Pion Exchange NN-Potential in Nuclear Matter and Nuclear Stability

1996-11-08

arxiv.org/abs/nucl-th/9611019v2

Nucl.Phys. A615 (1997) 501-515

Physics

Nuclear Physics

Nuclear Theory

19 pages LaTeX, 4 postscript figures

Scientific paper

10.1016/S0375-9474(96)00482-4

A meson exchange model of the $\pi\pi$ interaction which fits free $\pi\pi$ scattering data is used to calculate the interactions of pions in nuclear matter as a function of nuclear density. Polarization of the nuclear medium by the pions results in a marked increase in the s-wave $\pi\pi$ attraction at low energy. The influence of this effect on the nucleon-nucleon interaction is a corresponding increase with density of the $NN$ central potential due to the exchange of two correlated pions, resulting in an $NN$ interaction which fails to saturate. A possible mechanism for restoring the theoretical stability of nuclear matter is explored and found to be effective.

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