Role of thermal fluctuations in the damping of the giant dipole resonance of spherical and deformed nuclei: 90Zr and 164Er |
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| Institution: | 1. Dipartimento di Fisica, Universita di Milano and INFN Sezione di Milano, Via Celoria 16, I-20133 Milan, Italy;2. Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark;1. Grand Accélérateur National d''Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Bd. Henri Becquerel, 14076 Caen, France;2. Universidade de Santiago de Compostela, E-15706 Santiago de Compostela, Spain;3. Departamento de Ciencias Integradas, Universidad de Huelva, E-21071 Huelva, Spain;4. Centro de Física Nuclear da Universidade de Lisboa, CFNUL, 1649-003 Lisboa, Portugal;5. Instituut voor Kern-en Stralingsfysica, K. U. Leuven, B-3001 Leuven, Belgium;6. KVI-CART, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen, The Netherlands;1. Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany;2. Helmholtz Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany;1. Los Alamos National Laboratory, Los Alamos, NM 87545, United States;2. Colorado School of Mines, Golden, CO 80401, United States;3. University of New Mexico, Albuquerque, NM 87131, United States |
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| Abstract: | We study the damping width of the giant dipole resonance (GDR) built on the ground state and on excited states of 90Zr, which is spherical at zero spin and temperature, and 164Er which is deformed. Neither of these nuclei changes appreciably their equilibrium shape when excited. Nonetheless, fluctuations due to finite temperature produce a marked increase in the width of the GDR of 90Zr, leaving essentially unchanged that of 164Er. This is because in the case of deformed nuclei thermal fluctuations imply the sampling of both larger and smaller deformations around the equilibrium shape, while spherical nuclei can only feel larger distortions. In spite of the stability of the GDR of 164Er, the angular distribution of the associated γ-rays is strongly affected by the temperature. |
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