Prompt Fission Neutron Experiments on 235U(n,f) and 252Cf(SF)

For nuclear modeling and improved evaluation of nuclear data knowledge about fluctuations of the prompt neutron multiplicity as a function of incident neutron energy is requested for the major actinides 235U and 239Pu. Experimental investigations of the prompt fission neutron emission in resonance neutron induced fission on 235U are taking place at the GELINA facility of the IRMM. The experiment employs an array of neutron scintillation-detectors (SCINTIA) in conjunction with a newly designed 3D position sensitive twin Frisch-grid ionization chamber. A preparatory experiment on prompt fission neutron emission in 252Cf(SF) was undertaken to verify analysis procedures relevant for the implementation of the SCINTIA neutron detector array. The available literature data on the TKE dependence of the multiplicity show strong deviations. Therefore, effort was focused on investigating experimental factors in low efficiency neutron counting experiments that may lead to faulty determination of this dependence. Taking these factors into account a result that agree well with data from high efficiency neutron counting experiments is obtained.

GÖÖK Alf;  HAMBSCH Franz-Josef;  OBERSTEDT Stephan;  VIDALI Marzio; 

2017-01-16

ELSEVIER BV

JRC105085

1875-3892,   

http://www.sciencedirect.com/science/article/pii/S187538921500142X,    https://publications.jrc.ec.europa.eu/repository/handle/JRC105085,   

10.1016/j.phpro.2015.04.026,