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Accurate mass measurements of very short-lived nuclei

Prerequisites for high-accuracy investigations of superallowed β-decays
  • F. Herfurth
  • A. Kellerbauer
  • F. Ames
  • G. Audi
  • D. Beck
  • K. Blaum
  • G. Bollen
  • O. Engels
  • H.-J. Kluge
  • D. Lunney
  • R.B. Moore
  • M. Oinonen
  • E. Sauvan
  • C. Scheidenberger
  • S. Schwarz
  • G. Sikler
  • C. Weber
  • and the ISOLDE Collaboration

Abstract:

Mass measurements of 34Ar, 73-78Kr, and 74,76Rb were performed with the Penning-trap mass spectrometer ISOLTRAP. Very accurate QEC-values are needed for the investigations of the \(\)t-value of 0+ → 0+ nuclear β-decays used to test the standard model predictions for weak interactions. The necessary accuracy on the QEC-value requires the mass of mother and daughter nuclei to be measured with δm/m ⩽ 3 . 10-8. For most of the measured nuclides presented here this has been reached. The 34Ar mass has been measured with a relative accuracy of 1.1 . 10-8. The QEC-value of the 34Ar 0+ → 0+ decay can now be determined with an uncertainty of about 0.01%. Furthermore, 74Rb is the shortest-lived nuclide ever investigated in a Penning trap.

PACS. 21.10.Dr Binding energies and masses – 24.80.+y Nuclear tests of fundamental interactions and symmetries 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • F. Herfurth
    • 1
  • A. Kellerbauer
    • 1
  • F. Ames
    • 2
  • G. Audi
    • 3
  • D. Beck
    • 4
  • K. Blaum
    • 4
  • G. Bollen
    • 5
  • O. Engels
    • 2
  • H.-J. Kluge
    • 4
  • D. Lunney
    • 3
  • R.B. Moore
    • 6
  • M. Oinonen
    • 7
  • E. Sauvan
    • 1
  • C. Scheidenberger
    • 4
  • S. Schwarz
    • 5
  • G. Sikler
    • 4
  • C. Weber
    • 4
  • and the ISOLDE Collaboration
  1. 1.CERN, 1211 Geneva 23, SwitzerlandCH
  2. 2.Sektion Physik, Ludwig-Maximilians-Universität München, 85748 Garching, GermanyDE
  3. 3.CSNSM-IN2P3-CNRS, 91405 Orsay Campus, FranceFR
  4. 4.GSI, Planckstraße 1, 64291 Darmstadt, GermanyDE
  5. 5.NSCL, Michigan State University, East Lansing MI 48824-1321, USAUS
  6. 6.Department of Physics, McGill University, Montréal (Québec) H3A 2T8, CanadaCA
  7. 7.Helsinki Institute of Physics, University of Helsinki, P.O. Box 9, 00014 Helsinki, FinlandFI

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