The GDR in Hg and Eu nuclei from selected decay chains

✍ Scribed by F. Camera; A. Bracco; G. Colombo; S. Leoni; B. Million; M. Mattiuzzi; A. Maj; M. Kmiecik; B. Herskind; R. Bark; J. Bearden; J.J. Gaardhøje; E.W. Ormand

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 421 KB
• Volume: 649
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(99)00048-2

✦ Synopsis

The "r-decay of the GDR in hot Hg and Eu isotopes has been measured in coincidence with selected low-energy 7-transitions of the evaporation residues.

In the I-Ig case, the GDR width at finite temperature and at different spins was studied by analyzing simultaneously with the statistical model the high-energy 3,-ray spectra associated with different residual nuclei and the fractions of residue cross-sections. The measured GDR width was found in good agreement with the predictions of the thermal fluctuations model.

In the case of Eu, we have measured the high-energy 3,-rays in coincidence with lowenergy 7-transitions from different nuclear configurations of 143Eu in order to search for the GDR decay built on a superdeformed state. The analysis of the data shows a possible evidence of this state. The measured intensity indicates that the superdeformation survives only few MeV above the yrast line.