²³⁵U(n,f), ²³⁸U(n,$$\gamma$$), ²³⁸U(n,f), and ²³⁸Pu(n,f) Reaction Rate Measurement Calibrations at ZPPR

Technical Report · Wed Dec 31 23:00:00 EST 1986

DOI:https://doi.org/10.2172/6819232· OSTI ID:6819232

Poenitz, W. P. ^[1]; Maddison, D. W. ^[1]; Gasidlo, J. M. ^[1]; Carpenter, S. G. ^[1]; Armani, R. J. ^[1]

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1. Argonne National Lab. (ANL), Argonne, IL (United States)

New reference deposits for ²³⁵U, ²³⁹Pu and ²³⁸U have been established with mass uncertainties of <0.2%. These new deposits replace the older reference deposits which were used during the last 17 years and improve the uncertainty of reaction rate measurements due to reference mass uncertainties by about a factor of 6. Measurements of the fission fragment absorption in 2π geometry have been made for these deposits using a new technique of comparing 2π and low-geometry count rates. Two measurements of the ²³⁸U capture rate in depleted uranium samples based upon the thermal cross sections of ²³⁸U(n,$$\gamma$$), ²³⁵U(n,f) and ²³⁹Pu(n,f) and based upon the ²⁴³Am calibration technique confirm the ZPPR measurement technique within the quoted uncertainty of ±0.5%.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6819232
• Report Number(s): ANL-87-5; ON: DE87005942
• Country of Publication: United States
• Language: English

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