Abstract
A low background system for the detection and characterization of spontaneously fissioning nuclides has been developed. It allows the simultaneous registration of single and coincident fission fragments and their kinetic energies, and of the number of neutrons emitted per fission event together with the time intervals between fission-fragment and neutron pulses. In addition, α-particle spectra can also be measured. The system consists of six pairs of surface barrier detectors surrounded by 30 3He-filled neutron counters embedded in paraffin. It is placed between two large plastic scintillation detectors in order to identify cosmic-ray induced background events. The detector assembly has been used in the search for superheavy elements in reactions of 238U projectiles with 238U and 248Cm targets and of 48Ca with 248Cm at production rates of a few atoms per experiment.
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