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Two-proton radioactivity of $^{45}$Fe

Abstract : 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.
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Submitted on : Friday, July 21, 2006 - 3:05:00 PM
Last modification on : Monday, November 30, 2020 - 11:04:04 AM

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J. Giovinazzo, Bertram Blank, M. Chartier, S. Czajkowski, Agnès Fleury, et al.. Two-proton radioactivity of $^{45}$Fe. Physical Review Letters, American Physical Society, 2002, 89, pp.102501. ⟨10.1103/PhysRevLett.89.102501⟩. ⟨in2p3-00019909⟩

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