Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 32: Postersitzung / Kernphysik

HK 32.17: Poster

Mittwoch, 24. März 1999, 10:15–12:00, Foyer

New collective mode due to collisional coupling in asymmetric nuclear matter — •K. Morawetz¹, U. Fuhrmann¹, R. Walke¹, and M. DiToro² — ¹AG Quantentheorie und Vielteilchensysteme, FB Physik, Universität Rostock, Universitätsplatz 3, D-18051 Rostock — ²Laboratorio Nazionale Del Sud, Via S. Sofia, 44-95123 Catania, Italy

Starting from a nonmarkovian conserving relaxation time approximation [1] 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 caused by collisional correlations. The latter one leads to the appearance of a third mode which can appear in the system [2]. We suggest that this mode might be observable in neutron rich systems like ¹¹Be while in proton rich isobares this mode should appear with strong damping.

[1] U. Fuhrmann, K. Morawetz, R. Walke, Phys. Rev. C 58 (1995), 1473

[2] K. Morawetz, U. Fuhrmann, R. Walke, M. DiToro, Phys. Rev. C 57 (1998), R2813.