n uc l - th / 9 61 10 19 v 2 1 1 N ov 1 99 6 SUNY - NTG - 96 - 42 The Two - Pion Exchange NN Potential in Nuclear Matter and Nuclear Stability
نویسندگان
چکیده
A meson exchange model of the ππ interaction which fits free ππ 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 ππ attraction at low energy. The influence of this effect on the nucleon-nucleon interaction is a corresponding increase with density of the N N central potential due to the exchange of two correlated pions, resulting in an N N 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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