Probing the shape of hot 194Hg at high spins with the giant dipole resonance decay in selected cascades -: art. no. 014306

被引:32
作者
Camera, F
Bracco, A
Leoni, S
Million, B
Mattiuzzi, M
Pignanelli, M
Maj, A
Kmiecik, M
Bark, R
Bearden, J
Gaardhoje, JJ
Ormand, WE
Lönnroth, T
Österbacka, R
机构
[1] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[2] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[3] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[4] Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[5] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
[6] Abo Akad Univ, Dept Phys, FIN-20500 Turku, Finland
来源
PHYSICAL REVIEW C | 1999年 / 60卷 / 01期
关键词
D O I
10.1103/PhysRevC.60.014306
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
High-energy gamma rays emitted by the decay of the hot compound nucleus Hg-194, formed in the reaction Si-30(142 MeV)+ Dy-164, 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 [T] similar or equal to 1.3 MeV. Instead, an average nuclear deformation corresponding to [beta] = 0.3 constant with spin has been deduced for 20<I<38 h by comparing the measured width to that predicted by the model of thermal shape fluctuations.
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页数:5
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