The problem of the damping of the Giant Dipole Resonance (GDR) at finite temperature at T>2 MeV is discussed here. The experimental results are based on fusion evaporation reactions. The most recent results on the mass region A = 132 (Ce isotopes) obtained in exclusive measurements are compared with the existing results on the A = 110–120 region (Sn isotopes). The comparison with the theoretical predictions based on thermal shape fluctuations is also discussed. The GDR width is found to increase also in the region T>2 MeV and this is accounted by the combined effect of the increase of the compound nucleus width (smaller lifetime) and to the increase of the average deformation of the nucleus.
Progress in the study of the gamma-decay of the giant dipole resonance in hot nuclei / A.Bracco, F. Camera, O. Wieland, E. Ormand. - In: MODERN PHYSICS LETTERS A. - ISSN 0217-7323. - 22:33(2007), pp. 2479-2492. [10.1142/S0217732307024474]
Progress in the study of the gamma-decay of the giant dipole resonance in hot nuclei
A. BraccoPrimo
;F. CameraSecondo
;
2007
Abstract
The problem of the damping of the Giant Dipole Resonance (GDR) at finite temperature at T>2 MeV is discussed here. The experimental results are based on fusion evaporation reactions. The most recent results on the mass region A = 132 (Ce isotopes) obtained in exclusive measurements are compared with the existing results on the A = 110–120 region (Sn isotopes). The comparison with the theoretical predictions based on thermal shape fluctuations is also discussed. The GDR width is found to increase also in the region T>2 MeV and this is accounted by the combined effect of the increase of the compound nucleus width (smaller lifetime) and to the increase of the average deformation of the nucleus.Pubblicazioni consigliate
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