Development of an experimental set-up for the measurement of neutron-induced fission and capture cross sections of radioactive fissile nuclei

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,