Probing the shape of hot {sup 194}Hg at high spins with the giant dipole resonance decay in selected cascades
- Dipartimento di Fisica, Universita di Milano, and INFN sez. Milano, via Celoria 16, I-20133 Milano (Italy)
- The Henryk Niewodniczanski Institute of Nuclear Physics, 31-342 Krakow (Poland)
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001 (United States)
- Department of Physics, bo Akademi, FIN-20500 Turku (Finland)
High-energy {gamma} rays emitted by the decay of the hot compound nucleus {sup 194}Hg, formed in the reaction {sup 30}Si(142 MeV)+{sup 164}Dy, have been measured in coincidence with different residual nuclei. The measured spectra and the relative residual-nucleus cross sections were simultaneously analyzed with the statistical model. Calculations assuming contributions from a GDR in superdeformed states were also made. No clear evidence was found that superdeformed shapes seen at T=0 survive at average nuclear temperature {l_angle}T{r_angle}{approx_equal}1.3 MeV. Instead, an average nuclear deformation corresponding to {l_angle}{beta}{r_angle}=0.3 constant with spin has been deduced for 20{lt}I{lt}38 {h_bar} by comparing the measured width to that predicted by the model of thermal shape fluctuations. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 351914
- Journal Information:
- Physical Review, C, Vol. 60, Issue 1; Other Information: PBD: Jul 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Single particle signatures in high-spin, quasicontinuum, states in {sup 193,194}Hg from g-factor measurements.
Scaling of the giant dipole resonance widths in hot rotating nuclei from the ground state values