TIME-DEPENDENT SHAPE FLUCTUATIONS AND THE GIANT-DIPOLE RESONANCE IN HOT NUCLEI - REALISTIC CALCULATIONS

被引：28

作者：

ALHASSID, Y ^{[1
]}

BUSH, B ^{[1
]}

机构：

[1] YALE UNIV,CTR THEORET PHYS,WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511

来源：

NUCLEAR PHYSICS A | 1990年 / 514卷 / 03期

关键词：

D O I：

10.1016/0375-9474(90)90151-B

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：

The effects of time-dependent shape fluctuations on the giant dipole resonance (GDR) in hot rotating nuclei are investigated. Using the framework of the Landau theory of shape transitions we develop a realistic macroscopic stochastic model to describe the quadrupole time-dependent shape fluctuations and their coupling to the dipole degrees of freedom. In the adiabatic limit the theory reduces to a previous adiabatic theory of static fluctuations in which the GDR cross section is calculated by averaging over the equilibrium distribution with the unitary invariant metric. Nonadiabatic effects are investigated in this model and found to cause structural changes in the resonance cross section and motional narrowing. Comparisons with experimental data are made and deviations from the adiabatic calculations can be explained. In these cases it is possible to determine from the data the damping of the quadrupole motion at finite temperature. © 1990.

引用

页码：434 / 460

页数：27

共 46 条

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