Revisiting the ²³⁸U Thermal Capture Cross Section and Gamma-Ray Emission Probabilities from ²³⁹Np Decay

A. TrkovInternational Atomic Energy Agency, Nuclear Data Section Department of Nuclear Sciences and Applications, Wagramerstrasse 5 P.O. Box 100, A-1400 Vienna, Austria

G. L. MolnárHungarian Academy of Sciences, Institute of Isotopes Chemical Research Center, P.O. Box 77, H-1525 Budapest, Hungary

Zs. RévayHungarian Academy of Sciences, Institute of Isotopes Chemical Research Center, P.O. Box 77, H-1525 Budapest, Hungary

S. F. MughabghabBrookhaven National Laboratory, National Nuclear Data Center Building 197D, P.O. Box 5000, Upton, New York 11973-5000

R. B. FirestoneLawrence Berkeley National Laboratory, Isotopes Project, Building 88 MS-88R0192, 1 Cyclotron Road, Berkeley, California 94720

V. G. PronyaevInternational Atomic Energy Agency, Nuclear Data Section Department of Nuclear Sciences and Applications, Wagramerstrasse 5 P.O. Box 100, A-1400 Vienna, Austria

A. L. NicholsInternational Atomic Energy Agency, Nuclear Data Section Department of Nuclear Sciences and Applications, Wagramerstrasse 5 P.O. Box 100, A-1400 Vienna, Austria

M. C. Moxon 3 Hyde Copse, Marcham, Abingdon, Oxfordshire OX13 6PT United Kingdom

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Abstract

The precise value of the thermal capture cross section of ²³⁸U is uncertain, and evaluated cross sections from various sources differ by more than their assigned uncertainties. A number of the original publications have been reviewed to assess the discrepant data, corrections were made for more recent standard cross sections and other constants, and one new measurement was analyzed. Because of the strong correlations in activation measurements, the gamma-ray emission probabilities from the β^– decay of ²³⁹Np were also analyzed. As a result of the analysis, a value of 2.683 ± 0.012 b was derived for the thermal capture cross section of ²³⁸U. A new evaluation of the gamma-ray emission probabilities from ²³⁹Np decay was also undertaken.

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Revisiting the ²³⁸U Thermal Capture Cross Section and Gamma-Ray Emission Probabilities from ²³⁹Np Decay

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Revisiting the ²³⁸U Thermal Capture Cross Section and Gamma-Ray Emission Probabilities from ²³⁹Np Decay