Behavior of the giant-dipole resonance in 120Sn and 208Pb at high excitation energy |
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| Affiliation: | 1. Dipartimento di Fisica, Università Degli Studi di Milano, and Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy;2. Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, MS-6373, Oak Ridge, TN 37831-6373, USA;3. The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark;1. Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue-Strasse 1, D-60438 Frankfurt am Main, Germany;2. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany;3. John von Neumann-Institut für Computing, Forschungzentrum Jülich, 52425 Jülich, Germany;4. Helmholtz Research Academy Hesse for FAIR, GSI Helmholtz Center, Campus Frankfurt, Max-von-Laue-Str. 12, 60438 Frankfurt, Germany;5. University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 University of Jyväskylä, Finland;6. Helsinki Institute of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China;3. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China;1. Triangle Universities Nuclear Laboratory, Durham, NC 27708, USA;2. Department of Physics, Duke University, Durham, NC 27708, USA;3. Department of Mathematics and Physics, North Carolina Central University, Durham, NC 27707, USA;4. College of William and Mary, Williamsburg, VA 23187, USA;5. Institute of Theoretical Physics and Astronomy, Vilnius University, LT-01108 Vilnius, Lithuania;6. Centro de Física Nuclear da Universidade de Lisboa, P-1649-003 Lisboa, Portugal;7. M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30348 Kraków, Poland;8. Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA;9. Institut für Theoretische Physik, Leibniz Universität Hannover, D-30167 Hannover, Germany;10. Department of Physics, The George Washington University, Washington, DC 20052, USA;1. Department of Automatic Test and Control, Harbin Institute of Technology, Harbin 150080, China;2. School of Electronics and Information Technique, Harbin Institute of Technology, China |
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| Abstract: | The properties of the giant-dipole resonance (GDR) are calculated as a function of excitation energy, angular momentum, and the compound nucleus particle decay width in the nuclei 120Sn and 208Pb, and are compared with recent experimental data. Differences observed in the behavior of the full-width-at-half-maximum of the GDR for 120Sn and 208Pb are attributed to the fact that shell corrections in 208Pb are stronger than in 120Sn, and favor the spherical shape at low temperatures. The effects shell corrections have on both the free energy and the moments of inertia are discussed in detail. At high temperature, the FWHM in 120Sn exhibits effects due to the evaporation width of the compound nucleus, while these effects are predicted for 208Pb. |
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