%0 Journal Article
%T Restoration of particle number as a good quantum number in BCS theory
%A D. J. Rowe
%J Physics
%D 2000
%I arXiv
%R 10.1016/S0375-9474(01)00588-7
%X As shown in previous work, number projection can be carried out analytically for states defined in a quasi-particle scheme when the states are expressed in a coherent state representation. The wave functions of number-projected states are well-known in the theory of orthogonal polynomials as Schur functions. Moreover, the functions needed in pairing theory are a particularly simple class of Schur functions that are easily constructed by means of recursion relations. It is shown that complete sets of states can be projected from corresponding quasi-particle states and that such states retain many of the properties of the quasi-particle states from which they derive. It is also shown that number projection can be used to construct a complete set of orthogonal states classified by generalized seniority for any nucleus.
%U http://arxiv.org/abs/nucl-ex/0009001v1