Prompt neutron decay constants and subcritical measurements for material control and accountability in SHEBA

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Rossi-Alpha measurements were performed on the SHEBA assembly to determine the prompt neutron decay constants. These prompt neutron decay constants represent an eigenvalue characteristic of this particular assembly, which can be used to infer the amount of fissile material in the assembly. In addition, subcritical measurements using Rossi-Alpha and the source-jerk techniques were also performed on the SHEBA assembly. These measurements were compared against TWODANT calculations and agreed quite well. The subcritical measurements were also used to obtain a unique signature that represented the amount of material associated with the degree of subcriticality of the SHEBA assembly. Finally, the Feynman ... continued below

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7 p.

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Sanchez, R. & Jaegers, P. August 1, 1998.

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Rossi-Alpha measurements were performed on the SHEBA assembly to determine the prompt neutron decay constants. These prompt neutron decay constants represent an eigenvalue characteristic of this particular assembly, which can be used to infer the amount of fissile material in the assembly. In addition, subcritical measurements using Rossi-Alpha and the source-jerk techniques were also performed on the SHEBA assembly. These measurements were compared against TWODANT calculations and agreed quite well. The subcritical measurements were also used to obtain a unique signature that represented the amount of material associated with the degree of subcriticality of the SHEBA assembly. Finally, the Feynman variance-to-mean technique in conjunction with TWODANT, were used to determine the effective delayed neutron fraction for the SHEBA assembly.

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7 p.

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INIS; OSTI as DE98007218

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  • International conference on the physics of nuclear science and technology, Long Island, NY (United States), 5-8 Oct 1998

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  • Other: DE98007218
  • Report No.: LA-UR--98-336
  • Report No.: CONF-981003--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 674733
  • Archival Resource Key: ark:/67531/metadc709137

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  • August 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 26, 2016, 3:37 p.m.

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Sanchez, R. & Jaegers, P. Prompt neutron decay constants and subcritical measurements for material control and accountability in SHEBA, article, August 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc709137/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.