New collective mode due to collisional coupling

Details New collective mode due to collisional coupling New collective mode due to collisional coupling

1998-02-27

arxiv.org/abs/nucl-th/9802083v1

Phys.Rev.C57:2813-2817,1998

Physics

Nuclear Physics

Nuclear Theory

Phys. Rev. C sub

Scientific paper

10.1103/PhysRevC.57.2813

Starting from a nonmarkovian conserving relaxation time approximation for collisions we derive coupled dispersion relations for asymmetric nuclear matter. The isovector and isoscalar modes are coupled due to asymmetric nuclear meanfield acting on neutrons and protons differently. A further coupling is observed by collisional correlations. The latter one leads to the appearance of a new soft mode besides isoscalar and isovector modes in the system. We suggest that this mode might be observable in asymmetric systems. This soft mode approaches the isovector mode for high temperatures. At the same time the isovector mode remains finite and approaches a constant value at higher temperatures showing a transition from zero sound like damping to first sound. The damping of the new soft mode is first sound like at all temperatures.

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