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Joakim

Joakim Cederkäll

Professor

Joakim

Isospin Symmetry in the sd Shell: Transition Strengths in the Neutron-deficient sd Shell Nucleus 33Ar

Author

  • A. Wendt
  • J. Taprogge
  • P. Reiter
  • Pavel Golubev
  • H. Grawe
  • S. Pietri
  • P. Boutachkov
  • A. Algora
  • F. Ameil
  • M. A. Bentley
  • A. Blazhev
  • D. Bloor
  • N. S. Bondili
  • M. Bowry
  • A. Bracco
  • N. Braun
  • F. Camera
  • Joakim Cederkäll
  • F. Crespi
  • A. de la Salle
  • Douglas DiJulio
  • P. Doornenbal
  • K. Geibel
  • Jnaneswari Gellanki
  • J. Gerl
  • J. Grȩbosz
  • G. Guastalla
  • T. Habermann
  • M. Hackstein
  • R. Hoischen
  • A. Jungclaus
  • E. Merchán
  • B. Million
  • A. Morales
  • K. Moschner
  • Zs. Podolyák
  • N. Pietralla
  • D. Ralet
  • M. Reese
  • Dirk Rudolph
  • L. Scruton
  • B. Siebeck
  • N. Warr
  • O. Wieland
  • H. J. Wollersheim
Show all

Summary, in English

Reduced transition strengths of the deexciting transitions from the first two excited states in 33Ar were measured in a relativistic Coulomb excitation experiment at the GSI Helmholtz center. The radioactive ion beam was produced by fragmentation of a primary 36Ar beam on a 9Be target followed by the selection of the reaction product of interest via the GSI Fragment Separator. The 33Ar beam hit a secondary 197Au target with an energy of approximately 145 MeV/nucleon. An array of high-purity germanium cluster detectors

and large-volume BaF2 scintillator detectors were employed for γ -ray spectroscopy at the secondary target position. The Lund-York-Cologne Calorimeter was used to track the outgoing ions and to identify the nuclear reaction channels. For the two lowest energy excited states of 33Ar the reduced transition strengths have been

determined. With these first results the Tz = −3/2 nucleus 33Ar is now, together with 21Na (Tz = −1/2), the only neutron-deficient odd-A sd shell nucleus in which experimental transition strengths are available. The experimental values are compared to results of shell-model calculations which describe simultaneously mirror-energy differences and transition-strength values of mirror pairs in the sd shell in a consistent way.

Department/s

  • Nuclear physics

Publishing year

2014

Language

English

Publication/Series

Physical Review C (Nuclear Physics)

Volume

90

Issue

5

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • relativistic projectile fragmentation
  • gamma-ray spectroscopy
  • isospin symmetry

Status

Published

Project

  • Nuclear Structure at the Limits: Isotope-selective Spectroscopy

Research group

  • Nuclear Structure

ISBN/ISSN/Other

  • ISSN: 0556-2813