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Conférences et séminaires » Séminaire présenté par L.CACERES Ganil, Caen

Séminaire présenté par L.CACERES Ganil, Caen

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Evolution of the N=28,50 and 82 Magic Numbers

Par : L.CACERES Ganil, Caen
Date : Jeudi 25 février à 16h
Lieu : IPHC, Salle de Reunion 2e Etage du
Bâtiment 27

Résumé :

It has been in the 50th when the experimental sequence of "magic numbers" (8, 20, 50, 82 and 126),valid in the valley of stability, could be explained by adding a strong spin-orbit interaction to the mean field potential. Nowadays, with the development of the new radioactive beam facilities, we know that these numbers may change or even disappear when approaching the limits of the nuclear chart.

In this seminar, selected experimental results from GSI and GANIL which shed light on the evolution of the shell closures in nuclei with extreme N/Z ratio will be presented making reference to how the high intensity beams provided SPIRAL2 facility will allow to puzzle out some of the challenges presented up to date.

On the very neutron rich side of the nuclear chart, we will discuss the N=82 shell closure through the isomeric decay of 130Cd and 131In nuclei located below 132Sn and its consequences for the r-process solar abundance calculations. Following, in the N=28 isotones we will examine by means of the in-flight gamma-spectroscopy in 44S, the influence of the N=28 shell quenching to the appearance of the deformation in the "semi-magic" nuclei south of 48Ca. And finally, we will come back shortly to the Sn isotopic chain but this time close to the self-conjugate 100Sn to try to understand the "magic" character of this nucleus and how a possible reduction of the N=50 shell gap may cause the development of quadrupole excitations.

Personne à contacter : Florent HAAS