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First evidence for the two-proton decay of 45Fe |
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| Authors: | M Pfützner E Badura C Bingham B Blank M Chartier H Geissel J Giovinazzo LV Grigorenko R Grzywacz M Hellström Z Janas J Kurcewicz AS Lalleman C Mazzocchi I Mukha G Münzenberg C Plettner E Roeckl KP Rykaczewski K Schmidt RS Simon M Stanoiu J-C Thomas |
| Institution: | (1) Institute of Experimental Physics, Warsaw University, PL-00-681 Warszawa, Poland, PL;(2) GSI, Planckstrasse 1, D-64291 Darmstadt, Germany, DE;(3) Department of Physics and Astronomy, University of Tennessee, Knoxville 37996 TN, USA, US;(4) CEN Bordeaux-Gradignan, F-33175 Gradignan Cedex, France, FR;(5) Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 3BX, UK, GB;(6) Physics Division, ORNL, Oak Ridge, TN 37831-6371, USA, US;(7) Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UK, GB;(8) GANIL, BP 5027, F-14021 Caen Cedex, France, FR |
| 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. Received: 17 May 2002 / Accepted: 28 May 2002 |
| Keywords: | PACS 21 10 Tg Lifetimes – 23 50 +z Decay by proton emission – 29 30 Ep Charged-particle spectroscopy |
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