GDR in hot nuclei: New measurements

Camera, F.; Kmiecik, M.; Wieland, O.; Benzoni, G.; Bracco, A.; Brambilla, S.; Crespi, F.; Mason, P.; Moroni, A.; Million, B.; Leoni, S.; Maj, A.; Styczeå, J.; Brekiesz, M.; Meczyåki, W.; Ziebliåski, M.; Gramegna, F.; Barlini, S.; Kravchuk, V. L.; Lanchais, A. L.; Mastinu, P. F.; Bruno, M.; D'Agostino, M.; Geraci, E.; Ordine, A.; Casini, G.; Chiari, M.

The measured properties of the Giant Dipole Resonance in hot rotating nuclei are successfully described with the model of thermal fluctuations, even though there are still some open problems especially at very low (T < 1.2 MeV), very high (T > 2.5 MeV) temperatures and missing data in some mass regions. Recent experimental works have addressed more specific problems regarding the nuclear shape and its behaviour in very particular and delimited phase space regions. In this paper will be discussed new exclusive measurements of the GDR gamma decay in heavy Rn-216 nuclei (where the shape of nuclei surviving fission have been probed) and some preliminary data on the Ce-132 nuclei at very high excitation energy. Keywords

GDR in hot nuclei: New measurements / Camera, F.; Kmiecik, M.; Wieland, O.; Benzoni, G.; Bracco, A.; Brambilla, S.; Crespi, F.; Mason, P.; Moroni, A.; Million, B.; Leoni, S.; Maj, A.; Styczeå , J.; Brekiesz, M.; Meczyå ki, W.; Ziebliå ski, M.; Gramegna, F.; Barlini, Sandro; Kravchuk, V. L.; Lanchais, A. L.; Mastinu, P. F.; Bruno, M.; D'Agostino, M.; Geraci, E.; Ordine, A.; Casini, Giovanni; Chiari, M.. - In: ACTA PHYSICA POLONICA B. - ISSN 0587-4254. - ELETTRONICO. - 36:(2005), pp. 1145-1153. (Intervento presentato al convegno 39th Zakopane School of Physics International Symposium).