614 articles – 3077 Notices  [english version]
 HAL : in2p3-00019909, version 1
 arXiv : nucl-ex/0205013
 Physical Review Letters 89 (2002) 102501
 two-proton radioactivity of $^{45}$Fe
 (2002)
 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.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/nucl-ex/0205013
 in2p3-00019909, version 1 http://hal.in2p3.fr/in2p3-00019909 oai:hal.in2p3.fr:in2p3-00019909 Contributeur : Pascale Chambon <> Soumis le : Vendredi 21 Juillet 2006, 15:05:00 Dernière modification le : Lundi 2 Mai 2011, 15:41:59