Wieland O, Bracco A, Camera F, Benzoni G, Blasi N, Brambilla S, Crespi F, Giussani A, Leoni S, Mason P, Million B, Moroni A, Barlini S, Kravchuk VL, 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 E. Giant dipole resonance in the hot and thermalized 132Ce nucleus: damping of collective modes at finite temperature.
PHYSICAL REVIEW LETTERS 2006;
97:012501. [PMID:
16907369 DOI:
10.1103/physrevlett.97.012501]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Indexed: 05/11/2023]
Abstract
The gamma decay of the giant dipole resonance (GDR) in the 132Ce compound nucleus with temperature up to approximately 4 MeV has been measured, using the reaction 64Ni + 68Zn at E(beam) = 300, 400, and 500 MeV. The gamma and charged particles measured in coincidence with recoils are consistent with a fully equilibrated compound nucleus emission. The GDR width, obtained with the statistical model analysis, is found to increase almost linearly with temperature. This increase is rather well reproduced within a model including thermal shape fluctuations and the lifetime of the compound nucleus.
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