Conférences et séminaires » Séminaire présenté par le Pr. Anatoli AFANASJEV, Mississippi State University, (...)

Séminaire présenté par le Pr. Anatoli AFANASJEV, Mississippi State University, USA

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Recent progress in covariant DFT : time-odd mean fields and single-particle degrees of freedom

Par : Prof. Anatoli AFANASJEV, Mississippi State University, USA
Date : mardi 12 juin 2012 à 11h00
Lieu : IPHC, Salle de Réunion 2e étage du Bâtiment 27

Résumé :

Covariant density functional theory (CDFT) is well established theoretical tool for the description of nuclear systems. However, there are still a number of important problems which have not been either addressed or satisfactorily resolved within its framework. In my talk, I will concentrate on two of them, namely, the physics of time-odd mean fields and single-particle degrees of freedom.

Time-odd mean fields are related to nuclear magnetism in covariant density functional theory. They arise from space-like components of vector mesons and Lorentz invariance requires that their coupling strengths are identical to that of time-like components. We performed systematic investigation of these fields in non-rotating and rotating nuclear systems. The physics of these fields and physical observables strongly affected by them will be discussed.

For a long period of time, the CDFT has been applied mostly to collective phenomena and only recently the interest has shifted to the description of the single-particle motion in nuclear systems. The successes and limitations of the description of single-particle degrees of freedom within the CDFT will be discussed. To improve the description of the properties of the predominantly single-particle states one should go beyond mean field approach and include particle-vibration coupling. This will be illustrated in spherical nuclei ranging from light up to superheavy ones.

Personne à contacter : Radomira LOZEVA

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