Conférences et séminaires » Séminaire présenté par le Dr. Fritz DÖNAU ( Forschungszentrum Dresden-Rossendorf
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Nuclear deformation and isovector Giant Dipole Resonance.
le Mercredi 21 février 2007 à 16 h00
Salle de Visioconférences - Bâtiment 25
IPHC, 23 rue du Loess, Strasbourg-Cronenbourg
The role of the nuclear deformation for the photo absorption cross section in the tail region of the electric Giant Dipole Resonance (GDR) is considered. It is found that extra electric dipole strength is generated at energies below the GDR maximum if the nuclear system is spacially deformed. This effect is important for the prediction of stellar photodisintegration rates. At variance to the so called Pygmy resonances this extra strength does not directly correlate with the neutron excess since the deformation is determined by nuclear shell effects. Simple model studies for the well-deformed axial Sm and Nd nuclei and the triaxially deformed Mo nuclei are presented. In the latter case new experimental results from photo scattering experiments obtained at the ELBE e-linac at Dresden are discussed.
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