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Diabatic effects in 186Pb: A generator-coordinate analysis

par Tajima, Naoki;Flocard, Hubert;Bonche, Paul;Dobaczewski, Jacek;Heenen, Paul-Henri
Référence Nuclear Physics A, 551, 3, page (409-433)
Publication Publié, 1993

Article révisé par les pairs

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Résumé :

We examine a possibility for quadrupole collective wavefunctions in 186Pb to remain localized within a diabatic potential. Our study uses the generator-coordinate method on a basis generated by the Hartree-Fock + BCS calculations. The mean field is constructed with the Skyrme force SIII while a seniority force describes pairing effects. The collective basis includes both Oqp states constrained on mass quadrupole moment and 2qp states built on the shape-driving intruder orbital π[514 9 2] (1h9 2). We find that the seniority pairing force, with strengths compatible with systematic trends, generates a too strong coupling between diabatic configurations. For such a state-independent pairing interaction, low-excitation-energy collective wavefunctions are not trapped at oblate deformations.