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Phys. Rev. Lett. 89, 102501 (2002) [4 pages]

Two-Proton Radioactivity of 45Fe

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J. Giovinazzo, B. Blank, M. Chartier *, S. Czajkowski, A. Fleury, M. J. Lopez Jimenez †, M. S. Pravikoff, and J.-C. Thomas
CEN Bordeaux-Gradignan, Le Haut-Vigneau, F-33175 Gradignan Cedex, France

F. de Oliveira Santos, M. Lewitowicz, V. Maslov ‡, and M. Stanoiu
Grand Accélérateur National d’Ions Lourds, B.P. 5027, F-14076 Caen Cedex, France

R. Grzywacz § and M. Pfützner
Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Poland

C. Borcea
IAP, Bucharest-Magurele, P.O. Box MG6, Romania

B. A. Brown
Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321

Received 21 May 2002; published 19 August 2002

In an experiment at the SISSI-LISE3 facility of GANIL, the decay of the proton drip line nucleus 45Fe has been studied. Fragment-implantation events have been correlated with radioactive decay events in a 16×16 pixel silicon-strip detector. The decay-energy spectrum of 45Fe implants shows a distinct peak at (1.14±0.04)  MeV with a half-life of T1/2=(4.7-1.4+3.4)  ms. None of the events in this peak is in coincidence with β particles. For a longer correlation interval, daughter decays of the two-proton daughter 43Cr can be observed after 45Fe implantation. The decay energy for 45Fe agrees nicely with several theoretical predictions for two-proton radioactivity.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.89.102501
DOI: 10.1103/PhysRevLett.89.102501
PACS: 23.50.+z, 27.40.+z

* Present address: Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom.
† Present address: CEA/DPTA/SPN Bruyères-le-Châtel, F-91680 Bruyères-le-Châtel, France.
‡ Present address: Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
§ Present address: Physics Division, ORNL, Oak Ridge, TN 37831-6371.

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