Large Area High-Efficiency Time-of Flight System for Detection of Low Energy Heavy Evaporation Residues at the Electrostatic Separator VASSILISSA

摘要

A large-area thin timing detector for slow heavy nuclei was developed. The apparatus is based on the transport of secondary electrons by micro-channel plate multipliers. To increase the registration efficiency secondary electrons are collected from the both sides of the emitter foil. An intrinsic time of (380(+-)30) ps and registration efficiency of (95(+-)5) % were obtained for the single TOF detector using (sup 226)Ra (alpha)-source. A time resolution of (400(+-)30) ps and registration efficiency close to 100% were measured for heavy ions for the single TOF detector. A time-of-flight system consisting of such detectors is extensively used in the experiments with heavy nuclei at the kinematic separator VASSILISSA (1,2). 12 refs., 6 figs., 2 tabs. (Atomindex citation 26:045287)