Critical Enhancement of the In-medium Nucleon-Nucleon Cross Section at low Temperatures

Details Critical Enhancement of the In-medium Nucleon-Nucleon Cross Section at low Temperatures Critical Enhancement of the In-medium Nucleon-Nucleon Cross Section at low Temperatures

1994-04-12

arxiv.org/abs/nucl-th/9404014v1

Phys.Rev.C50:31-37,1994

Physics

Nuclear Physics

Nuclear Theory

10 pages with 4 figures (available on request from the authors), MPG-VT-UR 34/94 accepted for publication in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.50.31

The in-medium nucleon-nucleon cross section is calculated starting from the thermodynamic T-matrix at finite temperatures. The corresponding Bethe-Salpeter-equation is solved using a separable representation of the Paris nucleon-nucleon-potential. The energy-dependent in-medium N-N cross section at a given density shows a strong temperature dependence. Especially at low temperatures and low total momenta, the in-medium cross section is strongly modified by in-medium effects. In particular, with decreasing temperature an enhancement near the Fermi energy is observed. This enhancement can be discussed as a precursor of the superfluid phase transition in nuclear matter.

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