Abstract
Extended gap equations are used to improve the pair distributions in excited states of superfluid nuclei. So one may obtain a better approximation of the low-seniority shell model, for energies and wave functions without any increase of computational labour. The reduction of pairing in excited states becomes more important as the number of quasiparticles increases, and yields changes in excitation energies which may be as large as 400 keV for three-quasi-particle states. Calculations have been performed for the Sn ( Z = 50) isotopes and the N = 50 isotones.
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