2022 Impact factor 2.7
Hadrons and Nuclei

Eur. Phys. J. A 14, 279-285 (2002)
DOI: 10.1140/epja/i2002-10033-9

Short Note

First evidence for the two-proton decay of $\chem{^{45}Fe}$

M. Pfützner1, E. Badura2, C. Bingham3, B. Blank4, M. Chartier5, H. Geissel2, J. Giovinazzo4, L.V. Grigorenko2, R. Grzywacz1, M. Hellström2, Z. Janas1, J. Kurcewicz1, A.S. Lalleman4, C. Mazzocchi2, I. Mukha2, G. Münzenberg2, C. Plettner2, E. Roeckl2, K.P. Rykaczewski6, 1, K. Schmidt7, R.S. Simon2, M. Stanoiu8 and J.-C. Thomas4

1  Institute of Experimental Physics, Warsaw University, PL-00-681 Warszawa, Poland
2  GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
3  Department of Physics and Astronomy, University of Tennessee, Knoxville 37996 TN, USA
4  CEN Bordeaux-Gradignan, F-33175 Gradignan Cedex, France
5  Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 3BX, UK
6  Physics Division, ORNL, Oak Ridge, TN 37831-6371, USA
7  Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UK
8  GANIL, BP 5027, F-14021 Caen Cedex, France


(Received: 17 May 2002 Communicated by J. Äystö)

Decays of five 45Fe atoms have been observed at the fragment separator of GSI. Whereas one event is consistent with the $\beta$-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 $1.1 \pm 0.1$ 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.

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

© Società Italiana di Fisica, Springer-Verlag 2002