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Title: Quasiparticle time blocking approximation in coordinate space as a model for the damping of the giant dipole resonance

Abstract

The quasiparticle time blocking approximation (QTBA) is presented as a model for the description of natural-parity excitations in open-shell nuclei. Most attention is paid to the question of the damping of the giant dipole resonance. Within the model pairing correlations, two-quasiparticle (2q), and 2qxphonon configurations are included. Thus the QTBA is an extension of the quasiparticle random phase approximation to include quasiparticle-phonon coupling. Calculational formulas are presented for the case of neutral natural-parity excitations in spherical nuclei. The main equations are written in the coordinate representation that allows to take into account single-particle continuum completely. The QTBA is applied to describe E1 photoabsorption cross sections in nuclei {sup 116,120,124}Sn. It has been obtained that the 2q(multiply-in-circle sign)phonon configurations provide noticeable fragmentation of the giant dipole resonance resulting in the appearance of a significant spreading width. The results are compared with available experimental data.

Authors:
 [1];  [2];  [3]
  1. Institute of Physics and Power Engineering, RU-249033 Obninsk (Russian Federation)
  2. (Germany)
  3. Nuclear Physics Department, V. A. Fock Institute of Physics, St. Petersburg State University, RU-198504 St. Petersburg (Russian Federation)
Publication Date:
OSTI Identifier:
20995280
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.75.054318; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHANNELING; CROSS SECTIONS; DIPOLES; EXCITATION; PARITY; PHONONS; RANDOM PHASE APPROXIMATION; RESONANCE; SPHERICAL CONFIGURATION; TIN 116; TIN 120; TIN 124

Citation Formats

Litvinova, E. V., Physik-Department der Technischen Universitaet Muenchen, D-85748 Garching, and Tselyaev, V. I.. Quasiparticle time blocking approximation in coordinate space as a model for the damping of the giant dipole resonance. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.054318.
Litvinova, E. V., Physik-Department der Technischen Universitaet Muenchen, D-85748 Garching, & Tselyaev, V. I.. Quasiparticle time blocking approximation in coordinate space as a model for the damping of the giant dipole resonance. United States. doi:10.1103/PHYSREVC.75.054318.
Litvinova, E. V., Physik-Department der Technischen Universitaet Muenchen, D-85748 Garching, and Tselyaev, V. I.. Tue . "Quasiparticle time blocking approximation in coordinate space as a model for the damping of the giant dipole resonance". United States. doi:10.1103/PHYSREVC.75.054318.
@article{osti_20995280,
title = {Quasiparticle time blocking approximation in coordinate space as a model for the damping of the giant dipole resonance},
author = {Litvinova, E. V. and Physik-Department der Technischen Universitaet Muenchen, D-85748 Garching and Tselyaev, V. I.},
abstractNote = {The quasiparticle time blocking approximation (QTBA) is presented as a model for the description of natural-parity excitations in open-shell nuclei. Most attention is paid to the question of the damping of the giant dipole resonance. Within the model pairing correlations, two-quasiparticle (2q), and 2qxphonon configurations are included. Thus the QTBA is an extension of the quasiparticle random phase approximation to include quasiparticle-phonon coupling. Calculational formulas are presented for the case of neutral natural-parity excitations in spherical nuclei. The main equations are written in the coordinate representation that allows to take into account single-particle continuum completely. The QTBA is applied to describe E1 photoabsorption cross sections in nuclei {sup 116,120,124}Sn. It has been obtained that the 2q(multiply-in-circle sign)phonon configurations provide noticeable fragmentation of the giant dipole resonance resulting in the appearance of a significant spreading width. The results are compared with available experimental data.},
doi = {10.1103/PHYSREVC.75.054318},
journal = {Physical Review. C, Nuclear Physics},
number = 5,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}