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|Title:||Neutron-Deuteron Elastic Scattering Measurements|
|Authors:||STANOIU Mihai; NANKOV NIKOLAY; PLOMPEN Arjan; ROUKI CHARIKLIA; KOZIER K.; RAO R.; ROUBTSOV D.; SVENNE J. P.; CANTON L.|
|Citation:||JOURNAL OF THE KOREAN PHYSICAL SOCIETY vol. 59 no. 2 p. 1825-1827|
|Publisher:||KOREAN PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||Neutron-deuteron elastic scattering is important for critical systems involving heavy water, including the CANDU (Canada Deuterium Uranium) reactor. A change of the elastic scattering angular distributions included in the ENDF/BVI. 5 evaluated data file for deuterium (and retained in ENDF/B-VII) has led to significant changes in C/E for LANL critical benchmark experiments containing heavy water and a small, but noticeable, change in C/E for coolant void reactivity experiments relevant for CANDU reactors. Follow-up involved first principles nuclear model calculations to obtain revised angular distributions from Faddeev 3-body theory, state of the art nucleon-nucleon forces, three-body and magnetic moment interactions. The calculated differences which are most pronounced occur in the domain just above the onset of anisotropy at 50-100 keV. Here, earlier measurements show contradictory results about the magnitude of this anisotropy. At IRMM measurements are carried out in the energy range from 100 keV to 2 MeV to test the angular distributions of neutron deuteron elastic scattering at angles where predictions show the largest differences (backward angles). An enriched sample (99.999% purity of duterium ), consisting of a molded polyethylene disc 70 mm in diameter and 3 mm thick, was prepared and delivered through AECL. Measurements are performed at the GELINA facility using a new setup based on detection of scattered neutrons using two HPGe detectors. In front of each detector a 10B4C converter is used. Meanwhile we started another project to detect the recoiling deuterium using a state of the art TPC (time projection chamber) filled with deuterated P10 gas.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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