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Séminaire présenté par le Prof. C. M. Petrache, CSNSM et Université Paris-Sud

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Exotic rotations and seniority isomers in Nd nuclei

Par : Prof. C. M. Petrache, CSNSM et Université Paris-Sud, Orsay
Date : jeudi 7 novembre 2013 à 10h30
Lieu : IPHC, Salle de Réunion 2e étage du Bâtiment 27

Résumé :

The existence of triaxial nuclei has been the subject of a long standing debate. The possibility of soft and rigid triaxiality has been proposed very early, and many theoretical and experimental studies have been devoted to this intriguing phenomenon since then. More recently two unique fingerprints of triaxiality in nuclei have been intensively studied : the wobbling motion and the dynamic chirality.

We have recently studied the Nd nuclei up to very high spins and identified a multitude of bands, which were interpreted as the manifestation of a stable triaxial nuclear shape, presenting various types of collective motion : tilted axis and principal axis rotation, wobbling motion, chiral bands. Another phenomenon revealed by our recent results on the Nd nuclei with neutron numbers just below the N=82 shell closure is the shape coexistence. It is induced by the existence of high-spin seniority isomers built on a spherical shape which are surrounded by triaxial bands.

The implications of the newly identified high-spin isomers will be discussed.

Personne à contacter : Radomira LOZEVA