Some Problems in the Interpretation of Exponential Experiments

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Buckling measurements at BNL have employed two experimental methods which in principle should yield identical results but in practice show a systematic and significant discrepancy. In this paper the experimental evidence of these errors is reviewed and their source is traced by means of theory to the radial flux transients which perturb the asymptotic neutron spectrum in the exponential assemblies. Some alternate and apparently more precise methods of analyzing the data are examined theoretically, including the possibility of anisotropy in the leakage probability.

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Hellens, Robert L. & Andersen, Eigil October 15, 1963.

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Buckling measurements at BNL have employed two experimental methods which in principle should yield identical results but in practice show a systematic and significant discrepancy. In this paper the experimental evidence of these errors is reviewed and their source is traced by means of theory to the radial flux transients which perturb the asymptotic neutron spectrum in the exponential assemblies. Some alternate and apparently more precise methods of analyzing the data are examined theoretically, including the possibility of anisotropy in the leakage probability.

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  • October 15, 1963

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  • Feb. 5, 2022, 9:58 a.m.

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  • Feb. 5, 2023, 4:42 a.m.

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Hellens, Robert L. & Andersen, Eigil. Some Problems in the Interpretation of Exponential Experiments, report, October 15, 1963; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1255882/: accessed July 18, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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