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Physical Review Letters 89 (2002) 102501
two-proton radioactivity of $^{45}$Fe
J. Giovinazzo1, B. Blank1, M. Chartier1, S. Czajkowski1, A. Fleury1, M.J. Lopez Jimenez1, M.S. Pravikoff1, J-C. Thomas1, F. de Oliveira Santos2, M. Lewitowicz2, V. Maslov, M. Stanoiu2, R. Grzywacz, M. Pfutzner, C. Borcea, B.A. Brown

In an experiment at the SISSI-LISE3 facility of GANIL, the decay of the proton drip-line nucleus Fe45 has been studied after projectile fragmentation of a Ni58 primary beam at 75 MeV/nucleon impinging on a natural nickel target. Fragment-implantation events have been correlated with radioactive decay events in a 16x16 pixel silicon strip detector on an event-by-event basis. The decay-energy spectrum of Fe45 implants shows a distinct peak at (1.06+/-0.04)MeV with a half-life of T1/2 = (4.7+3.4-1.4)ms. None of the events in this peak is in coincidence with beta particles which were searched for in a detector next to the implantation detector. For a longer correlation interval, daughter decays of the two-proton daughter Cr43 can be observed after Fe45 implantation. The decay energy for Fe45 agrees nicely with several theoretical predictions for two-proton emission. Barrier-penetration calculations slightly favour a di-proton emission picture over an emission of two individual protons and point thus to a He2 emission mode.
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
Physique/Physique Nucléaire Expérimentale
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