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Joakim

Joakim Cederkäll

Professor

Joakim

Measurement of the sign of the spectroscopic quadrupole moment for the 2(1)(+) state in Se-70: No evidence for oblate shape

Author

  • A. M. Hurst
  • P. A. Butler
  • D. G. Jenkins
  • P. Delahaye
  • F. Wenander
  • F. Ames
  • C. J. Barton
  • T. Behrens
  • A. Burger
  • Joakim Cederkäll
  • E. Clement
  • T. Czosnyka
  • T. Davinson
  • G. de Angelis
  • J. Eberth
  • Andreas Ekström
  • S. Franchoo
  • G. Georgiev
  • A. Gorgen
  • R. -D. Herzberg
  • M. Huyse
  • O. Ivanov
  • J. Iwanicki
  • G. D. Jones
  • P. Kent
  • U. Koester
  • T. Kroell
  • R. Kruecken
  • A. C. Larsen
  • M. Nespolo
  • M. Pantea
  • E. S. Paul
  • M. Petri
  • H. Scheit
  • T. Sieber
  • S. Siem
  • J. F. Smith
  • A. Steer
  • I. Stefanescu
  • N. U. H. Syed
  • J. Van de Walle
  • P. Van Duppen
  • R. Wadsworth
  • N. Warr
  • D. Weisshaar
  • M. Zielinska

Summary, in English

Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of Se-70 ions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitation gamma rays in the highly segmented MINIBALL gamma-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2(+) state is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the first 2(+) state in Se-70, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.

Department/s

  • Nuclear physics

Publishing year

2007

Language

English

Publication/Series

Physical Review Letters

Volume

98

Issue

7

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114