First evidence for the two-proton of "4"5Fe

Decays of five "4"5Fe atoms have been observed at the Fragment Separator of GSI. Whereas one event is consistent with #beta# decay of "4"5Fe accompanied by the emission of a 10 MeV proton, four decays are consistent with the emission of particle(s) of total energy of 1.1 #+-# 0.1 MeV. This observation represents the first evidence for two-proton ground state radioactivity, a decay mode predicted for "4"5Fe. The time distribution of the observed decay events corresponds to a half-life of 3.2_-_1_._0"+"2"."6 ms. (orig.)Available from TIB Hannover: RO 801(2002-17) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman