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NUMBER CONSERVING APPROACH IN QUASIPARTICLE REPRESENTATION

M. R. OUDIH

Centre de Recherche Nucléaire d'Alger, 2 Bd. Frantz Fanon, BP. 399 Alger-Gare, Algiers, Algeria

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M. FELLAH

Centre de Recherche Nucléaire d'Alger, 2 Bd. Frantz Fanon, BP. 399 Alger-Gare, Algiers, Algeria

Laboratoire de Physique Théorique, Faculté de Physique, USTHB BP 32, El Alia, 16111 Bab Ezzouar, Algiers, Algeria

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N. H. ALLAL

Centre de Recherche Nucléaire d'Alger, 2 Bd. Frantz Fanon, BP. 399 Alger-Gare, Algiers, Algeria

Laboratoire de Physique Théorique, Faculté de Physique, USTHB BP 32, El Alia, 16111 Bab Ezzouar, Algiers, Algeria

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https://doi.org/10.1142/S0218301303001193Cited by:15 (Source: Crossref)

Abstract

An exact number conserving approach is formulated in the quasiparticle representation to show the effect of the particle-number projection on the ground and the first 0⁺ excited states. It is applied to the two-level pairing model, which allows an exact solution and a comparison to other approaches. The present method has proved to be an advantageous alternative as compared to the BCS and to the usual methods used to restore the particle number symmetry.

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