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Statut |
Confirmé |
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Série |
NUC-THEO |
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Domaines |
nucl-th |
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Date |
Jeudi 21 Mars 2019 |
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Heure |
11:30 |
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Institut |
IPN |
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Salle |
Bâtiment 100, Salle A201 |
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Nom de l'orateur |
Bennaceur |
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Prenom de l'orateur |
Karim |
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Addresse email de l'orateur |
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Institution de l'orateur |
Université de Lyon, Institut de Physique Nucléaire de Lyon |
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Titre |
Bubble nuclei and finite-size instabilities in mean-field calculations. |
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Résumé |
Finite-size instabilities are unphysical phase transitions that plague several parameterizations of effective interactions used in self-constistent mean-field calculations. They take the form of large-amplitude oscillations of the isovector density, or the vector (spin) density if time reversal symmetry in not enforced. I will briefly review a study we made concerning the isovector instabilities and discuss a quantitative tool that we have developed in order to detect and avoid them during the fit of the parameters of an interaction. Since the so called bubble (or semi-bubble) nuclei show significant oscillations in proton and neutron densities often quantified by a depletion factor, it is interesting to see how the proximity of an isovector instability may be correlated with this depletion factor. Finally, I will revisit some results for several nuclei considered as having a possible bubble structure and question the predictive power of the zero or finite-range interactions used for these predictions. |
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Numéro de preprint arXiv |
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Commentaires |
$ $ |
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Fichiers attachés |
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