A new experimental set-up for a simultaneous measurement of neutron induced capture and fission cross sections was designed, assembled and optimized. The measurements will be performed at GEel LINear Accelerator (GELINA) neutron time-of-flight facility in Belgium, where neutron cross sections can be measured over a wide energy range with high energy resolution. The fission events detector consists of a dedicated multi-plate high efficiency fission ionization chamber (IC). The γ-rays produced in capture reaction are detected by an efficient array of C6D6 scintillators. Fission γ-rays events are distinguished from capture events by the anticoincidence signals from the IC and the C6D6 detectors. For the undetected fission events a correction has to be applied with respect to the efficiency of the IC that should be high and known with a high precision. Another important issue is the good separation between fission-fragment (FF) and the high alpha pile-up. The performances of the IC during test experiments are presented, focusing in particular on the detection efficiency.
COMPANIS I.;
AICHE Mourad;
MATHIEU L.;
SCHILLEBEECKX Peter;
HEYSE Jan;
BARREAU G.;
CZAJKOWSKI C.;
DUCASSE Q.;
GUNSING F.;
JURADO B.;
KESSEDJIAN G.;
MATARRANZ J.;
PLOMPEN Arjan;
TSEKHANOVICH I.;
2014-01-31
EDP Sciences
JRC88535
2100-014X,
http://dx.doi.org/10.1051/epjconf/20136205007,
https://publications.jrc.ec.europa.eu/repository/handle/JRC88535,
10.1051/epjconf/20136205007,
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