The gamma decay of the giant dipole resonance (GDR) in the 132Ce compound nucleus with temperature up to ap 4 MeV has been measured, using the reaction 64Ni+68Zn at Ebeam=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.
Giant Dipole Resonance in the hot and thermalized 132Ce nucleus : damping of collective modes at finite temperature / O. 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. Ormand. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 97:1(2006), pp. 012501.012501-1-012501.012501-4. [10.1103/PhysRevLett.97.012501]
Giant Dipole Resonance in the hot and thermalized 132Ce nucleus : damping of collective modes at finite temperature
A. Bracco;F. Camera;G. Benzoni;F. Crespi;A. Giussani;S. Leoni;P. Mason;
2006
Abstract
The gamma decay of the giant dipole resonance (GDR) in the 132Ce compound nucleus with temperature up to ap 4 MeV has been measured, using the reaction 64Ni+68Zn at Ebeam=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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