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Title: Giant Dipole Resonance in the hot and thermalized 132Ce nucleus: damping of collective modes at finite temperature

Abstract

The {gamma} decay of the Giant Dipole Resonance in the {sup 132}Ce compound nucleus with temperature up to {approx} 4 MeV has been measured. The symmetric {sup 64}Ni + {sup 68}Zn at E{sub beam} = 300, 400, 500 MeV and the asymmetric reaction {sup 16}O + {sup 116}Sn at E{sub beam} = 130, 250 MeV have been investigated. Light charged particles and {gamma} rays have been detected in coincidence with the recoiling compound system. In the case of the mass symmetric {sup 64}Ni induced reaction the {gamma} and charged particle spectral shapes are found to be consistent with the emission from a fully equilibrated compound nuclei and the GDR parameters are extracted from the data using a statistical model analysis. The GDR width is found to increase almost linear with temperature. This increase is rather well reproduced within a model which includes both the thermal fluctuation of the nuclear shape and the lifetime of the compound nucleus.

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
936669
Report Number(s):
UCRL-JRNL-222203
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0805622
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 97; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHARGED PARTICLES; COMPOUND NUCLEI; DAMPING; DECAY; DIPOLES; FLUCTUATIONS; LIFETIME; RESONANCE; SHAPE; STATISTICAL MODELS

Citation Formats

Wieland, O, Bracco, A, Camera, F, Benzoni, G, Blasi, N, Brambilla, S, Crespi, F, Giussani, A, Leoni, S, Million, B, Moroni, A, Barlini, S, Kravchuk, V L, Gramegna, F, Lanchais, A, Mastinu, P, Maj, A, Brekiesz, M, Kmiecik, M, Bruno, M, Geraci, E, Vannini, G, Casini, G, Chiari, M, Nannini, A, Ordine, A, and Ormand, W E. Giant Dipole Resonance in the hot and thermalized 132Ce nucleus: damping of collective modes at finite temperature. United States: N. p., 2006. Web.
Wieland, O, Bracco, A, Camera, F, Benzoni, G, Blasi, N, Brambilla, S, Crespi, F, Giussani, A, Leoni, S, Million, B, Moroni, A, Barlini, S, Kravchuk, V L, Gramegna, F, Lanchais, A, Mastinu, P, Maj, A, Brekiesz, M, Kmiecik, M, Bruno, M, Geraci, E, Vannini, G, Casini, G, Chiari, M, Nannini, A, Ordine, A, & Ormand, W E. Giant Dipole Resonance in the hot and thermalized 132Ce nucleus: damping of collective modes at finite temperature. United States.
Wieland, O, Bracco, A, Camera, F, Benzoni, G, Blasi, N, Brambilla, S, Crespi, F, Giussani, A, Leoni, S, Million, B, Moroni, A, Barlini, S, Kravchuk, V L, Gramegna, F, Lanchais, A, Mastinu, P, Maj, A, Brekiesz, M, Kmiecik, M, Bruno, M, Geraci, E, Vannini, G, Casini, G, Chiari, M, Nannini, A, Ordine, A, and Ormand, W E. 2006. "Giant Dipole Resonance in the hot and thermalized 132Ce nucleus: damping of collective modes at finite temperature". United States. https://www.osti.gov/servlets/purl/936669.
@article{osti_936669,
title = {Giant Dipole Resonance in the hot and thermalized 132Ce nucleus: damping of collective modes at finite temperature},
author = {Wieland, O and Bracco, A and Camera, F and Benzoni, G and Blasi, N and Brambilla, S and Crespi, F and Giussani, A and Leoni, S and Million, B and Moroni, A and Barlini, S and Kravchuk, V L and Gramegna, F and Lanchais, A and Mastinu, P and Maj, A and Brekiesz, M and Kmiecik, M and Bruno, M and Geraci, E and Vannini, G and Casini, G and Chiari, M and Nannini, A and Ordine, A and Ormand, W E},
abstractNote = {The {gamma} decay of the Giant Dipole Resonance in the {sup 132}Ce compound nucleus with temperature up to {approx} 4 MeV has been measured. The symmetric {sup 64}Ni + {sup 68}Zn at E{sub beam} = 300, 400, 500 MeV and the asymmetric reaction {sup 16}O + {sup 116}Sn at E{sub beam} = 130, 250 MeV have been investigated. Light charged particles and {gamma} rays have been detected in coincidence with the recoiling compound system. In the case of the mass symmetric {sup 64}Ni induced reaction the {gamma} and charged particle spectral shapes are found to be consistent with the emission from a fully equilibrated compound nuclei and the GDR parameters are extracted from the data using a statistical model analysis. The GDR width is found to increase almost linear with temperature. This increase is rather well reproduced within a model which includes both the thermal fluctuation of the nuclear shape and the lifetime of the compound nucleus.},
doi = {},
url = {https://www.osti.gov/biblio/936669}, journal = {Physical Review Letters},
issn = {0031-9007},
number = ,
volume = 97,
place = {United States},
year = {Fri Jun 16 00:00:00 EDT 2006},
month = {Fri Jun 16 00:00:00 EDT 2006}
}