Title: A position-sensitive twin ionization chamber for fission fragment and prompt neutron correlation experiments
Authors: GÖÖK ALFGEERTS WouterHAMBSCH Franz-JosefOBERSTEDT StephanVIDALI MarzioZEYNALOV Sh.
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT vol. 830 p. 366–374
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2016
JRC N°: JRC100829
ISSN: 0168-9002
URI: http://www.sciencedirect.com/science/article/pii/S0168900216305435
http://publications.jrc.ec.europa.eu/repository/handle/JRC100829
DOI: 10.1016/j.nima.2016.06.002
Type: Articles in periodicals and books
Abstract: A twin position sensitive Frisch grid ionization chamber, intended as fission fragment detector in experiments to study prompt fission neutron correlations with fission fragment properties, is presented. Fission fragment mass and energies are determined by means of the double kinetic energy technique, based on conservation of mass and linear momentum. The position sensitivity is achieved by replacing each anode plate in the standard twin ionization chamber by a wire plane and a strip anode, both readout by means of resistive charge division. This provides information about the fission axis orientation, which is necessary to reconstruct the neutron emission process in the fully accelerated fragment rest-frame. The energy resolution compared to the standard twin ionization chamber is found not to be affected by the modification. The angular resolution of the detector relative to an arbitrarily oriented axis is better than 7 FWHM. Results on prompt fission neutron angular distributions in 235U(n,f) obtained with the detector in combination with an array of neutron scintillation detectors is presented as a proof of principle.
JRC Directorate:Nuclear Safety and Security

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