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

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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

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Alpha particles emitted from the decay of uranium in a UF
6
matrix can interact with fluorine and generate neutrons via the 
19
F(?,n)
22
Na reaction. These neutrons can be used to determine the uranium content in a UF
6
storage cylinder. The accuracy of this self-interrogating, non-destructive assay (NDA) technique is, however, limited by the uncertainty of the 
19
F(?,n)
22
Na cross section. We have performed complementary measurements of the 
19
F(?,n)
22
Na reaction with both 
4
He and 
19
F beams to improve the precision of the 
19
F(?,n)
22
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 
19
F(?,n)
22
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
6
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.

1. 37 inorganic, organic, physical, and analytical chemistry
2. 73 nuclear physics and radiation physics
3. 98 nuclear disarmament, safeguards, and physical protection
4. Fluorine 19 target
5. Sodium 22

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