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Quenching of the giant dipole resonance strength at high excitation energy
Populating nuclei at progressively higher thermal energies up to the limits of their existence, one can follow the evolution of the Giant Dipole Resonance (GDR) in extreme conditions up to its disappearance. The study of the GDR features at high excitation energy is particularly interesting because it also opens up the possibility to investigate the limits of validity of the standard statistical scenario in describing the decay properties of hot nuclei.
During the talk the experimental results mainly collected up to E* = 500MeV in mass region A=110-132 will be presented and compared to statistical model calculations. The evidence in the gamma spectra of a vanishing of the GDR strength at high excitation energies relative to the standard statistical calculation led to the development of different theoretical models trying to explain this effect whose main features will be discussed.
A comparison between data and statistical calculations including different model prescriptions will be presented and some conclusions concerning the effects leading to the GDR disappearance will be drawn.
Domenico Santonocito
INFN-LNS
27/09/2019 à 11:00
IPN Orsay, salle A018, bâtiment 100

Notes de dernières minutes :

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IPN

Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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