Giant Dipole Resonance in the Hot and Thermalized 132Ce Nucleus: Damping of Collective Modes at Finite Temperature

none28The gamma decay of the giant dipole resonance (GDR) in the 132Ce compound nucleus with temperature up to about 4 MeV has been measured, using the reaction 64Ni + 68Zn at Ebeam = 300, 400, and 500 MeV. The gammas 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.noneO.Wieland; A. Bracco; F. Camera; G. Benzoni; N. Blasi; S. Brambilla; F. Crespi; A. Giussani; S. Leoni; P. Mason; B. Million; A. Moroni; S. Barlini; V. L. Kravchuk; F. Gramegna; A. Lanchais; P. Mastinu; A. Maj; M. Brekiesz; M. Kmiecik; M. Bruno; E. Geraci; G. Vannini; G. Casini; M. Chiari; A. Nannini; A. Ordine; E. OrmandO.Wieland; A. Bracco; F. Camera; G. Benzoni; N. Blasi; S. Brambilla; F. Crespi; A. Giussani; S. Leoni; P. Mason; B. Million; A. Moroni; S. Barlini; V. L. Kravchuk; F. Gramegna; A. Lanchais; P. Mastinu; A. Maj; M. Brekiesz; M. Kmiecik; M. Bruno; E. Geraci; G. Vannini; G. Casini; M. Chiari; A. Nannini; A. Ordine; E. Orman