A kinematically complete, interdisciplinary, and co-institutional measurement of the <sup>19</sup>F(?,n) cross section for nuclear safeguards science [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 541.3 Miscellaneous topics in physical chemistry

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016

Mô tả vật lý: Size: 128 p. : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 268139

 Alpha particles emitted from the decay of uranium in a UF<
 sub>
 6<
 /sub>
  matrix can interact with fluorine and generate neutrons via the <
 sup>
 19<
 /sup>
 F(?,n)<
 sup>
 22<
 /sup>
 Na reaction. These neutrons can be used to determine the uranium content in a UF<
 sub>
 6<
 /sub>
  storage cylinder. The accuracy of this self-interrogating, non-destructive assay (NDA) technique is, however, limited by the uncertainty of the <
 sup>
 19<
 /sup>
 F(?,n)<
 sup>
 22<
 /sup>
 Na cross section. We have performed complementary measurements of the <
 sup>
 19<
 /sup>
 F(?,n)<
 sup>
 22<
 /sup>
 Na reaction with both <
 sup>
 4<
 /sup>
 He and <
 sup>
 19<
 /sup>
 F beams to improve the precision of the <
 sup>
 19<
 /sup>
 F(?,n)<
 sup>
 22<
 /sup>
 Na cross section over the alpha energy range that encompasses common actinide alpha decay needed for NDA studies. We have determined an absolute cross section for the <
 sup>
 19<
 /sup>
 F(?,n)<
 sup>
 22<
 /sup>
 Na reaction to an average precision of 7.6% over the alpha energy range of 3.9 ? 6.7 MeV. We utilized this cross section in a simulation of a 100 g spherical UF<
 sub>
 6<
 /sub>
  assembly and obtained a change in neutron emission rate values of approximately 10-12%, and a significant (factor of 3.6) decrease in the neutron emission rate uncertainty (from 50-51% to 13-14%), compared to simulations using the old cross section. Our new absolute cross section enables improved interpretations of NDAs of containers of arbitrary size and configuration.
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