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Pairing correlations. II.: Microscopic analysis of odd-even mass staggering in nuclei

par Duguet, Thomas;Bonche, Paul;Heenen, Paul-Henri ;Meyer, Jacques
Référence Physical Review C (Nuclear Physics)
Publication Publié, 2002

Article révisé par les pairs

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Résumé :

The odd-even mass staggering in nuclei is analyzed in the context of self-consistent mean-field calculations, for spherical as well as for deformed nuclei. For these nuclei, the respective merits of the energy differences [Formula Presented] and [Formula Presented] to extract both the pairing gap and the time-reversal symmetry breaking effect at the same time are extensively discussed. The usual mass formula [Formula Presented] is shown to contain additional mean-field contributions when realistic pairing is used in the calculation. A simple tool is proposed in order to remove the time-reversal symmetry breaking effects from [Formula Presented] Extended comparisons with the odd-even mass staggering obtained in the zero-pairing limit (schematic model and self-consistent calculations) show the nonperturbative contribution of pairing correlations on this observable. © 2001 The American Physical Society.