Isospin effects on the GDR in Vlasov Method
J.S. Wang2 - W.Q. Shen1,2 - Y.H. Cai1,2,4 - Y.G. Ma1,2,3 - J. Feng1,2 - D.Q. Fang2 - X.Z. Cai2 - Q.M. Su2
1 CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China
2 Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, P.R. China
3 Fudan-T.D.Lee Physics Laboratory, Fudan University, Shanghai, 200433, P.R. China
4 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou, 730000,
P.R. China
Received: 20 February 1999 / Revised version: 21 May 1999 Communicated by P. Schuck
Abstract
The systematics of the isovector Giant Dipole Resonance (GDR) is studied via the microscopic
semi-classical Vlasov method. The calculated results of the peak energy and the widths (FWHM) of the
GDR strength distribution can reproduce the experimental data and follow the empirical formula. The
isospin effects on the peak energy and the widths of the GDR strength distribution are found small and
these effects increase slightly with the (N-Z)/A. The characteristics of the GDR have been studied as
a function of the temperature in very heavy compound systems (A>300). The interplay between one-body
damping and two-body damping is also discussed.
PACS
24.30.Cz Giant resonance -
20.60.Ev collective model
Copyright Società Italiana di Fisica, Springer-Verlag 2000
