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

Pestov spark counter prototype development for the CERN-LHC ALICE experiment

A prototype Pestov Spark Counter with 2-dimensional position resolution has been developed. The position resolution is 0.32 mm and <2 mm in transverse and longitudinal direction, respectively. Beam tests yielded both the time resolution and the efficiency in accordance with earlier results obtained at BNIP Novosibirsk. A longterm stability test has been performed and stable behaviour for more then 3 months was observed. (orig.)10 refs.SIGLEAvailable from TIB Hannover: RO 801(95-74) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman