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Author Kolomietz, V. M. ♦ Plujko, V. A. ♦ Shlomo, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ COLLECTIVE EXCITATIONS ♦ DAMPING ♦ COLLECTIVE MODEL ♦ KINETIC EQUATIONS ♦ RELAXATION ♦ TWO-BODY PROBLEM ♦ MEAN-FIELD THEORY ♦ VIBRATIONAL STATES ♦ GIANT RESONANCE ♦ TRANSITION TEMPERATURE ♦ HOT NUCLEI ♦ NUCLEAR MATTER ♦ WIDTH
Abstract Damping of giant collective vibrations in nuclei is studied within the framework of the Landau-Vlasov kinetic equation. A phenomenological method of independent sources of dissipation is proposed for taking into account the contributions of one-body dissipation, the relaxation due to the two-body collisions and the particle emission. An expression for the intrinsic width of slow damped collective vibrations is obtained. In the general case, this expression cannot be represented as a sum of the widths associated with the different independent sources of the damping. This is a peculiarity of the collisional Landau-Vlasov equation where the Fermi-surface distortion effect influences both the self-consistent mean field and the memory effect at the relaxation processes. The interplay between the one-body, the two-body, and the particle emission channels which contribute to the formation of the total intrinsic width of the isoscalar 2{sup +} and 3{sup {minus}} and isovector 1{sup {minus}} giant multipole resonances in cold and hot nuclei is discussed. We have shown that the criterion for the transition temperature {ital T}{sub tr} between the zero-sound and first-sound regimes in hot nuclei is different from the case of infinite nuclear matter due to the contribution from the one-body relaxation and the particle emission. In the case of the isovector GDR the corresponding transition can be reached at temperature {ital T}{sub tr}=4{endash}5 MeV. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review, C
Volume Number 54
Issue Number 6


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