Skip to Main content Skip to Navigation
Conference papers

Quenching of the Giant Dipole Resonance Strength at High Excitation Energy

Abstract : The evolution with excitation energy of the Giant Dipole Resonance features in nuclei of mass A≈108−136 is reviewed. We first discuss the results of the experiments performed with MEDEA studying the GDR gamma decay from hot nuclei populated at excitation energies above 300 MeV. The focus of the paper is on the excitation energy region between 160 and 290 MeV. This region has been investigated through the study of the reactions 116Sn + 12C at 17 and 23A MeV, and 116Sn + 24Mg at 17A MeV. Gamma-rays were detected using MEDEA in coincidence with evaporation residues detected in MACISTE. The analysis of the gamma-ray spectra and their comparison with statistical calculations are presented. The comparison with γ-ray spectra from the reaction 36Ar + 98Mo at higher excitation energies shows a coherent scenario where a progressive reduction of γ multiplicity relative to predictions for 100% of the Energy Weighted Sum Rule is observed above 200 MeV excitation energy. Finally, the existence of a link between disappearance of collective motion and the liquid-gas phase transitions is discussed.
Document type :
Conference papers
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00159875
Contributor : Suzanne Robert <>
Submitted on : Wednesday, July 4, 2007 - 12:30:23 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:16 PM

Identifiers

Collections

Citation

D. Santonocito, Y. Blumenfeld, C. Agodi, R. Alba, G. Bellia, et al.. Quenching of the Giant Dipole Resonance Strength at High Excitation Energy. 2nd International Conference on Collective Motion in Nuclei under Extreme Conditions - COMEX 2, Jun 2006, Sankt Goar, Germany. pp.215c-223c, ⟨10.1016/j.nuclphysa.2007.01.009⟩. ⟨in2p3-00159875⟩

Share

Metrics

Record views

124