Title: Neutron-multiplicity experiments for enhanced fission modelling
Authors: AL-ADILI A.TARRIO D.HAMBSCH FRANZ-JOSEFGÖÖK ALFJANSSON K.SOLDERS A.RAKAPOULOS V.GUSTAVSSON C.LANTZ M.MATTERA A.OBERSTEDT STEPHANPROKOFIEV A. V.SUNDEN E. A.VIDALI MARZIOOESTERLUND M.POMP S.
Citation: EPJ Web of Conferences vol. 146 p. 04056
Publisher: EDP Sciences
Publication Year: 2017
JRC N°: JRC103671
ISSN: 2100 014X
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC103671
DOI: 10.1051/epjconf/201714604056
Type: Articles in periodicals and books
Abstract: The nuclear de-excitation process of fission fragments (FF) provides fundamental information for the understanding of nuclear fission and nuclear structure in neutron-rich isotopes. The variation of the prompt-neutron multiplicity, ν(A), as a function of the incident neutron energy (En) is one of many open questions. It leads to significantly different treatments in various fission models and implies that experimental data are analyzed based on contradicting assumptions. One critical question is whether the additional excitation energy (Eexc) is manifested through an increase of ν(A) for all fragments or for the heavy ones only. A systematic investigation of ν(A) as a function of En has been initiated. Correlations between prompt-fission neutrons and fission fragments are obtained by using liquid scintillators in conjunction with a Frisch-grid ionization chamber. The proof-of-principle has been achieved on the reaction 235U(nth,f) at the Van De Graff (VdG) accelerator of the JRC-Geel using a fully digital data acquisition system. Neutrons from 252Cf(sf) were measured separately to quantify the neutron-scattering component due to surrounding shielding material and to determine the intrinsic detector efficiency. Prelimenary results on ν(A) and spectrum in correlation with FF properties are presented.
JRC Directorate:Nuclear Safety and Security

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