The Age of Fission Neutrons to Indium-Resonance Energy in Graphite

R. W. Campbell; R. K. Paschall; V. A. Swanson

doi:dx.doi.org/10.13182/NSE64-A20986

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The Age of Fission Neutrons to Indium-Resonance Energy in Graphite

R. W. Campbell, R. K. Paschall, V. A. Swanson

Nuclear Science and Engineering / Volume 20 / Number 4 / December 1964 / Pages 445-454

Technical Paper / dx.doi.org/10.13182/NSE64-A20986

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The age of fission neutrons to indium-resonance energy has been measured in AGOT graphite using the point-source technique. Corrections to the data arising from the following factors were investigated: (a) source and foil size, (b) finite dimensions of medium, (c) higher- and/or lower-energy activations, and (d) angular sensitivity of detector foils. The age was determined to be 307.8 ± 1.9 cm²; the fourth and sixth moments were 6.58 ± 0.05 × 10⁶ cm⁴ and 3.84 ± 0.06 × 10¹⁰ cm⁶, respectively. These agree well with the values of 307.4 ± 1.0 cm², 6.59 ± 0.06 × 10⁶ cm⁴, and 4.01 ± 0.09 × 10¹⁰ cm⁶ obtained by Monte Carlo calculations.