ANHARMONICITY IN EXTENDED RPA

被引：35

作者：

BEAUMEL, D

CHOMAZ, P

机构：

[1] UNIV PARIS 11,DIV PHYS THEOR,CNRS,UNITE RECH,F-91405 ORSAY,FRANCE

[2] UNIV PARIS 06,DIV PHYS THEOR,CNRS,UNITE RECH,F-75252 PARIS 05,FRANCE

来源：

ANNALS OF PHYSICS | 1992年 / 213卷 / 02期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1016/0003-4916(92)90052-N

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present an anlytical formula for the calculation of the anharmonicity of the two-phonon states which is based on a variational derivation of RPA-like equations for a many-fermion system. Analytical estimations of the anharmonicity have been made using the Lipkin model and a degenerated schematic model. The formula obtained, together with the extended RPA predictions, has been checked by comparison with the exact solutions of the models. A rough estimate of the anharmonicity of the two-phonon state built on the Giant Dipole Resonance and on the Giant Quadrupole Resonance has been deduced. © 1992.

引用

页码：405 / 428

页数：24

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