Speaker
Michael Seidlitz
(Universität zu Köln)
Description
Nuclear shell effects in neutron-rich Na nuclei at the border of the island of inversion around N=20 were studied by measuring reduced transition probabilities, i.e. B(E2) and B(M1) values. To this end Coulomb-excitation experiments, employing radioactive 29,30Na beams with a final beam energy of 2.85 MeV/u, were performed at REX-ISOLDE, CERN. De-excitation gamma rays were detected by the MINIBALL gamma-ray spectrometer in coincidence with scattered particles in a segmented Si detector. The measured B(E2) values agree well with shell-model predictions, supporting the idea that in the Na isotopic chain the ground-state wave function contains significant intruder admixture already at N=18, with N=19 having an almost pure 2p2h deformed ground-state configuration.
This work has been supported by the German BMBF, by the FWO-Vlaanderen, by the IAP Belgian Science Policy (BriX network), by the UK STFC, by the EURONS, and by the ENSAR.
Authors
Michael Seidlitz
(Universität zu Köln)
Prof.
Peter Reiter
(Universität zu Köln)
Co-authors
Andrey Atanasov Blazhev
(Universität zu Köln)
Beyhan Bastin
(K.U. Leuven)
Burkhard Siebeck
(Universität zu Köln)
Christophe Sotty
(Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse)
Christopher Bauer
(Technische Universität Darmstadt)
David Wolfgang Schneiders
(Universität zu Köln)
Didier Voulot
(CERN)
Fredrik John Carl Wenander
(CERN)
Georgi Georgiev
(Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse)
Hilde De Witte
(K.U. Leuven)
Jan Diriken
(K.U. Leuven)
Jan Taprogge
(Universität zu Köln)
Janne Pakarinen
(University of Jyvaskyla)
Jarno Van De Walle
(University of Groningen)
Joakim Cederkall
(Lund University)
Katarzyna Wrzosek-Lipska
(Warsaw University)
Kathrin Wimmer
(Central Michigan University)
Kerstin Geibel
(Institut für Kernphysik, Universität zu Köln)
Liam Gaffney
(K.U. Leuven)
Marcus Scheck
(University of the West of Scottland)
Mark L Huyse
(K.U. Leuven)
Nele Kesteloot
(K.U. Leuven)
Nick Bree
(K.U. Leuven)
Nigel Victor Warr
(Universität zu Köln)
Peter Butler
(University of Liverpool)
Philip J. WOODS
(University of Edinburgh)
Piet Van Duppen
(K.U. Leuven)
Reiner Krücken
(TRIUMF)
Richard Altenkirch
(Universität zu Köln)
Roman August Gernhaeuser
(Technische Universität München)
Rudolf Josef Lutter
(Ludwig-Maximilians-Universität München)
Thomas Davinson
(University of Edinburgh)
Thorsten Kroell
(Technische Universitaet Darmstadt)
Tim Steinbach
(Universität zu Köln)
