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- W1970789569 abstract "We study the pairing energy in the ground state of a system of N particles occupying a symmetric two-level model space with a level degeneracy ensuremath{Omega}. Assuming a pairing Hamiltonian, we calculate the energies of the projected BCS states, using the exact, the Kamlah, and the Lipkin-Nogami particle number projection methods. We find that conclusions regarding the quality of the BCS approximation as well as various approximate projection methods, drawn from studying the N=ensuremath{Omega} case alone, are not valid in the more general Nensuremath{ne}ensuremath{Omega} case when the pairing interaction is weak." @default.
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- W1970789569 date "1992-10-01" @default.
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- W1970789569 title "Pairing correlations studied in the two-level model" @default.
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- W1970789569 doi "https://doi.org/10.1103/physrevc.46.1355" @default.
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