Title: On the use of the generalized SPRT method in the equivalent hard sphere approximation for nuclear data evaluation
Authors: NOGUERE G.ARCHIER P.BOULAND OLIVIERCAPOTE R.DE SAINT JEAN C.KOPECKY STEFANSCHILLEBEECKX PETERSIRAKOV I.TAMAGNO P.
Citation: EPJ Web of Conferences vol. 146 p. 02036
Publisher: EDP Sciences
Publication Year: 2017
JRC N°: JRC108668
ISSN: 2100 014X
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC108668
DOI: 10.1051/epjconf/201714602036
Type: Articles in periodicals and books
Abstract: A consistent description of the neutron cross sections from thermal energy up to the MeV region is challenging. One of the first steps consists in optimizing the optical model parameters using average resonance parameters, such as the neutron strength functions. They can be derived from a statistical analysis of the resolved resonance parameters, or calculated with the generalized form of the SPRT method by using scattering matrix elements provided by optical model calculations. One of the difficulties is to establish the contributions of the direct and compound nucleus reactions. This problem was solved by using a slightly modified average R-Matrix formula with an equivalent hard sphere radius deduced from the phase shift originating from the potential. The performances of the proposed formalism are illustrated with results obtained for the 238U+n nuclear systems.
JRC Directorate:Nuclear Safety and Security

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