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|Title:||Status of D(n,n)D Elastic Scattering Data|
|Authors:||KOZIER K.; ROUBTSOV D.; RAO R.; SVENNE J. P.; CANTON L.; PLOMPEN Arjan; STANOIU Mihai; NANKOV NIKOLAY; ROUKI CHARIKLIA|
|Citation:||Proceedings of PHYSOR 2010, ISBN: 978-0-89448-079-9 p. 1-12|
|Publisher:||American Nuclear Society|
|Type:||Articles in periodicals and books|
|Abstract:||An overview is presented of activities to reduce uncertainties in the neutron differential elasticscattering cross-section data for deuterium. The main subject is the amount of backscatter at energies below 3.2 MeV observed in different differential cross-section measurements and represented in various evaluations, together with the reactivity impact this has in simulations of relevant integral experiments. The scope encompasses fundamental nuclear-data measurements, three-body nuclear-theory calculations, evaluated nuclear-data libraries and associated data processing, and the simulation of critical experiments involving heavy water. The reactivity impact is illustrated using MCNP5 simulations of ZED-2 and other experiments. The simulations incorporate refinements, such as preparation of thermal-scattering-law data files for D-in-D2O to the nearest ºC using NJOY99 and inclusion of photonuclear data to account for the reactivity effects of (gamma,n) reactions. The analysis indicates that the energy grid ENDF/B-VII.0 uses to represent the angular distributions for deuterium elastic scattering should be refined. Additional work is planned, including new angular-distribution measurements at the GELINA facility at IRMM in Geel, Belgium using a CD2 (deuterated polyethylene) sample provided by AECL and scaling of new nuclear-theory-based elastic-scattering cross-section results. Preliminary GELINA findings using a C6D6 target indicate less backscatter than predicted by ENDF/B-VII.0, in contrast to the nuclear-theory results. It is expected that completion of the planned work will reduce the uncertainty of the energy-angle distributions for deuterium elastic scattering and contribute to an improved deuterium evaluation in a future release of ENDF/B-VII.|
|JRC Directorate:||Health, Consumers and Reference Materials|
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