Projection techniques as methods of particle-number symmetry restoration

被引：18
|
作者：
Oudih, M. R. [1 ,2 ]
Fellah, M. [1 ,2 ]
Allal, N. H. [1 ,2 ]
Benhamouda, N. [1 ,2 ]
机构：
[1] Univ Sci & Technol Houari Boumediene, Fac Phys, Phys Theor Lab, Bab Ezzouar 16111, Algiers, Algeria
[2] Ctr Rech Nucl Alger, COMENA, Algiers, Algiers, Algeria
来源：
PHYSICAL REVIEW C | 2007年 / 76卷 / 04期
关键词：
D O I：
10.1103/PhysRevC.76.047307
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 accuracy of the variation before (VBP) and after (VAP) particle-number projection methods, the Lipkin-Nogami (LN) prescription, and the projected Lipkin-Nogami (PLN) method have been studied using two exactly solvable models. It is shown that the VBP and the LN methods are rather dubious not only in a weak pairing regime, but also in strong pairing for the evaluation of quantities other than the ground state energy. The PLN method provides good results for the ground and the excited state energies, but it must be used with caution for the occupation probabilities and the observables that strongly depend on it. It seems that the VAP is the only suitable method for a global description of the nuclear properties.
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页数：4
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