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First evidence for the two-proton decay of 45Fe

  • M. Pfützner
  • E. Badura
  • C. Bingham
  • B. Blank
  • M. Chartier
  • H. Geissel
  • J. Giovinazzo
  • L.V. Grigorenko
  • R. Grzywacz
  • M. Hellström
  • Z. Janas
  • J. Kurcewicz
  • A.S. Lalleman
  • C. Mazzocchi
  • I. Mukha
  • G. Münzenberg
  • C. Plettner
  • E. Roeckl
  • K.P. Rykaczewski
  • K. Schmidt
  • R.S. Simon
  • M. Stanoiu
  • J.-C. Thomas
Short Note

Abstract:

Decays of five 45Fe atoms have been observed at the fragment separator of GSI. Whereas one event is consistent with the β-decay of 45Fe accompanied by the emission of a 10 MeV proton, four decays are consistent with the emission of particle(s) of total energy 1.1±0.1 MeV. This observation represents the first evidence for two-proton ground-state radioactivity, a decay mode predicted for 45Fe. The time distribution of the observed decay events corresponds to a half-life of 3.2+2.6-1.0 ms.

PACS. 21.10.Tg Lifetimes – 23.50.+z Decay by proton emission – 29.30.Ep Charged-particle spectroscopy 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • M. Pfützner
    • 1
  • E. Badura
    • 2
  • C. Bingham
    • 3
  • B. Blank
    • 4
  • M. Chartier
    • 5
  • H. Geissel
    • 2
  • J. Giovinazzo
    • 4
  • L.V. Grigorenko
    • 2
  • R. Grzywacz
    • 1
  • M. Hellström
    • 2
  • Z. Janas
    • 1
  • J. Kurcewicz
    • 1
  • A.S. Lalleman
    • 4
  • C. Mazzocchi
    • 2
  • I. Mukha
    • 2
  • G. Münzenberg
    • 2
  • C. Plettner
    • 2
  • E. Roeckl
    • 2
  • K.P. Rykaczewski
    • 6
  • K. Schmidt
    • 7
  • R.S. Simon
    • 2
  • M. Stanoiu
    • 8
  • J.-C. Thomas
    • 4
  1. 1.Institute of Experimental Physics, Warsaw University, PL-00-681 Warszawa, PolandPL
  2. 2.GSI, Planckstrasse 1, D-64291 Darmstadt, GermanyDE
  3. 3.Department of Physics and Astronomy, University of Tennessee, Knoxville 37996 TN, USAUS
  4. 4.CEN Bordeaux-Gradignan, F-33175 Gradignan Cedex, FranceFR
  5. 5.Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 3BX, UKGB
  6. 6.Physics Division, ORNL, Oak Ridge, TN 37831-6371, USAUS
  7. 7.Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UKGB
  8. 8.GANIL, BP 5027, F-14021 Caen Cedex, FranceFR

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