Temperature evolution of the GDR width and Jacobi shape transitions in hot rotating 88Mo nuclei
Presented by Mr. Michał CIEMAłA on 10 Jun 2010 from 16:10 to 16:30
Type: oral with financial aid
Track: Fusion reactions and synthesis of heavy and superheavy nuclei
I'm PhD student. If it is possible financial support would be welcome.
The study of the properties of the giant dipole resonance (GDR) at high temperature and angular momentum is one of the central topics in nuclear structure as it provides insight into the behavior of nuclei under extreme conditions. The wealth of experimental data on this subject covers in most cases an interval of temperatures up to 2.5 MeV and is mainly based on the study of the GDR gamma-decay from fusion-evaporation reactions. These data have been shown to provide an important testing ground for the theoretical models. In particular, the change of the GDR width with angular momentum and temperature reflects the role played by quantal and thermal fluctuations in the damping of the giant vibrations. Certain nuclei are expected to exhibit very exotic behavior – the Jacobi shape transition. This phenomenon is predicted as an abrupt change from an oblate shape at the so called critical value of spin to triaxial and to more elongated shapes, and finally undergoes scission. First results from the experiment performed in LNL Legnaro aiming at investigating the spin and temperature evolution of the 88Mo nucleus as well as the GDR width at high temperature will be presented. The 48Ti beam at 300, 450 and 600 MeV bombarded 40Ca target producing 88Mo compound nucleus at temperatures 3, 3.8 and 4.5 MeV respectively. The coupled GARFIELD and HECTOR detector arrays were used, which allowed to measure high-energy gamma rays, charged particles, evaporation residua and fission fragments.
Location: Conference Hall
- M. KMIECIK Institute of Nuclear Physics PAN Krakow
- B. FORNAL Institute of Nuclear Physics PAN Krakow
- V.L. KRAVCHUK Laboratori Nazionali di Legnaro, Legnaro
- F. GRAMEGNA Laboratori Nazionali di Legnaro, Legnaro