Conférences et séminaires » Séminaire présenté par le Dr. Thomas DUGUET, IRFU/CEA, Saclay

Séminaire présenté par le Dr. Thomas DUGUET, IRFU/CEA, Saclay

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Ab initio take on the definition, meaning and usefulness of effective single-particle energies in nuclei

Par : Dr. Thomas DUGUET, IRFU/CEA, Saclay
Date : mardi 3 juillet 2012 à 11h00
Lieu : IPHC, Salle de Réunion 2e étage du Bâtiment 27

Résumé :

The concept of single-nucleon shells dates back to the early days of nuclear physics and constitutes the basic pillar of the nuclear shell model and of our understanding of nuclear structure.

This presentation will start by revisiting the only unambiguous definition of effective single-particle energies (ESPEs) from the perspective of one-nucleon transfer reactions. Second, the meaning and the usefulness of ESPE in correlated many-fermion systems will be addressed. Specifically, several points of interest will be discussed and illustrated through ab-initio coupled-cluster calculations of closed-shell oxygen isotopes. Such points deal with the impact of correlations on both ESPEs and one-nucleon separation energies, the error made by computing ESPEs approximately, the extent to which ESPEs are "observable", how complete the experimental data need to be to extract ESPEs with tolerable error and the extent to which actual observables, e.g. one-nucleon separation energies and the energy of the first excited 2+, are correlated with the size of the gap at the Fermi energy in the ESPE spectrum.

Personne à contacter : Radomira LOZEVA