Germanium-gated γ–γ fast timing of excited states in fission fragments using the EXILL&FATIMA spectrometer

2014 
A high-granularity mixed spectrometer consisting of high-resolution Ge and very fast LaBr3(Ce)scintillator detectors has been installed around a fission target at the cold-neutron guide PF1B of the high-flux reactor of the Institut Laue–Langevin. Lifetimes of excited states in the range of 10 ps to 10 ns can be measured in around 100 exotic neutron-rich fission fragments using Ge-gated LaBr3(Ce)– LaBr3(Ce) or Ge–Ge–LaBr3(Ce)–LaBr3(Ce) coincidences. We report on various characteristics of the EXILL&FATIMA spectrometer for the energy range of 40 keV up to 6.8 MeV and present results of pslifetime test measurements in a fission fragment. The results are discussed with respect to possible systematic errors induced by background contributions. & 2014 Published by Elsevier B.V.
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