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Collisional width of giant resonances and interplay with Landau damping

Journal Article · · Phys. Rev. C; (United States)

We present a semiclassical method to calculate the widths of giant resonances. We solve a mean-field kinetic equation (Vlasov equation) with collision terms treated within the relaxation time approximation to construct a damped strength distribution for collective motions. The relaxation time is evaluated from the time evolution of distortions in the nucleon momentum distribution using a test-particle approach. The importance of an energy dependent nucleon-nucleon cross section is stressed. Results are shown for isoscalar giant quadrupole and octupole motions. A quite important interplay between self-consistent (Landau) and collisional damping is revealed.

Research Organization:
Sektion Physik, Universitat Munchen, D-8046 Garching, Federal Republic of Germany Dipartimento di Fisica, Universita di Catania 57, Corso Italia, I-95129 Catania, Italy Istituto Nazionale di Fisica Nucleare, Sezione di Catania, 57 Corso Italia, I-95129 Catania, Italy(DE)
OSTI ID:
6037997
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:6; ISSN PRVCA
Country of Publication:
United States
Language:
English