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Title: Interplay between one-body and collisional damping of collective motion in nuclei

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. Inmore » 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.}« less

Authors:
; ;  [1]
  1. Institute for Nuclear Research, Prosp. Nauki 47, 252028 Kiev (Ukraine)
Publication Date:
OSTI Identifier:
397696
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 54; Journal Issue: 6; Other Information: PBD: Dec 1996
Country of Publication:
United States
Language:
English
Subject:
66 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

Citation Formats

Kolomietz, V M, Plujko, V A, Shlomo, S, and Cyclotron Institute, Texas A&M University, College Station, Texas 77843. Interplay between one-body and collisional damping of collective motion in nuclei. United States: N. p., 1996. Web. doi:10.1103/PhysRevC.54.3014.
Kolomietz, V M, Plujko, V A, Shlomo, S, & Cyclotron Institute, Texas A&M University, College Station, Texas 77843. Interplay between one-body and collisional damping of collective motion in nuclei. United States. doi:10.1103/PhysRevC.54.3014.
Kolomietz, V M, Plujko, V A, Shlomo, S, and Cyclotron Institute, Texas A&M University, College Station, Texas 77843. Sun . "Interplay between one-body and collisional damping of collective motion in nuclei". United States. doi:10.1103/PhysRevC.54.3014.
@article{osti_397696,
title = {Interplay between one-body and collisional damping of collective motion in nuclei},
author = {Kolomietz, V M and Plujko, V A and Shlomo, S and Cyclotron Institute, Texas A&M University, College Station, Texas 77843},
abstractNote = {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.}},
doi = {10.1103/PhysRevC.54.3014},
journal = {Physical Review, C},
number = 6,
volume = 54,
place = {United States},
year = {1996},
month = {12}
}