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Monte Carlo simulation of transfer reactions using extendedR-matrix theory picturing surrogate-type WFCF features

Abstract : This article supplies an overview of issues related to the interpretation of surrogate measurement results for neutron-incident cross section predictions; difficulties that are somehow masked by the historical conversion route based on Weisskopf-Ewing approximation. Our proposal is to handle the various difficulties by using a more rigorousapproach relying on Monte Carlo simulation of transfer reactions with extended R-matrix theory. The multiple deficiencies of the historical surrogate treatment are recalled but only one is examined in some details here; meaning the calculation of in-out-going channel Width Fluctuation Correction Factors (WFCF) which behavior witness partly the failure of Niels Bohr's compound nucleus theoretical landmark. Relevant WFCF calculations according to neutron-induced surrogate- and cross section-types as a function of neutron-induced fluctuating energy range [0 - 2.1 MeV] are presented and commented in the case of the 240Pu* and 241Pu* compound nucleus isotopes.
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https://hal-cea.archives-ouvertes.fr/cea-02442360
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Submitted on : Thursday, January 16, 2020 - 1:43:28 PM
Last modification on : Tuesday, April 28, 2020 - 11:28:17 AM

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  • HAL Id : cea-02442360, version 1

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O. Bouland. Monte Carlo simulation of transfer reactions using extendedR-matrix theory picturing surrogate-type WFCF features. 3rd International Workshop on Nuclear Data Evaluation for Reactor Applications (WONDER - 2015), Oct 2015, Saint-Paul-lez-Durance, France. ⟨cea-02442360⟩

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