Title: Use of Prompt Fission Neutrons for Measuring the Fission Efficiency
Authors: COMPANIS I.MATHIEU L.AICHE MouradSCHILLEBEECKX PeterHEYSE JANBARREAU G.CZAJKOWSKI SergeDUCASSE Q.GUNSING F.JURADO B.KESSEDJIAN GregoireMATARRANZ J.TSEKHANOVICH I.
Citation: PHYSICS PROCEDIA vol. 59 p. 167-172
Publisher: ELSEVIER BV
Publication Year: 2014
JRC N°: JRC105400
ISSN: 1875-3892
URI: http://www.sciencedirect.com/science/article/pii/S187538921400501X
http://publications.jrc.ec.europa.eu/repository/handle/JRC105400
DOI: 10.1016/j.phpro.2014.10.026
Type: Articles in periodicals and books
Abstract: The pressing need for high-precision data on neutron-induced reactions of interest for emerging nuclear technologies and nuclear astrophysics has triggered the development of new methods and experiments, especially on capture cross-section measurements of fissile nuclei. In these measurements, radiative capture γ-rays are hidden in a large background of fission γ-rays. The latter has then to be subtracted via a veto method, by detecting fission events with a very good efficiency. This efficiency is limited by the backscattering and the self-absorption of the fission fragments (FF) in the target, and by the alpha radioactivity of the sample. An accurate determination of the fission efficiency is rather difficult. It is often determined by using known fission cross sections if the neutron flux is given. However, in some cases, the fission cross section is not well known and the neutron flux cannot be measured with sufficient accuracy. Another method to determine the fission efficiency is based on the detection of prompt fission neutrons in coincidence or anti-coincidence with the fission detector. Different examples are presented and advantages and disadvantages of this method will be discussed.
JRC Directorate:Nuclear Safety and Security

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