Eur. Phys. J. A 10, 289-294

Collisional damping of giant monopole and quadrupole resonances

S. Yildirim¹, A. Gokalp¹, O. Yilmaz¹ and S. Ayik<sup>2

1</sup>  Physics Department, Middle East Technical University, 06531 Ankara, Turkey
²  Physics Department, Tennessee Technological University, Cookeville TN 38505, USA

(Received: 9 January 2001 / Revised version: 16 March 2001 Communicated by P. Schuck)

Abstract
Collisional damping widths of giant monopole and quadrupole excitations for ¹²⁰Sn and ²⁰⁸Pb at zero and finite temperatures are calculated within Thomas-Fermi approximation by employing the microscopic in-medium cross-sections of Li and Machleidt and the phenomenological Skyrme and Gogny forces, and are compared with each other. The results for the collisional widths of giant monopole and quadrupole vibrations at zero temperature as a function of the mass number show that the collisional damping of giant monopole vibrations accounts for about of the observed widths at zero temperature, while for giant quadrupole vibrations it accounts for only of the observed widths at zero temperature.

PACS
24.30.Cz - Giant resonances.
24.30.Gd - Other resonances.
25.70.Ef - Resonances.
25.70.Lm - Strongly damped collisions.

© Società Italiana di Fisica, Springer-Verlag 2001