Measurement of the normalized ²³⁸U(n,f)/²³⁵U(n,f) cross section ratio from threshold to 30 MeV with the fission Time Projection Chamber

R. J. Casperson , D. M. Asner , J. Baker , R. G. Baker , J. S. Barrett , N. S. Bowden , C. Brune , J. Bundgaard

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E. Burgett D. A. Cebra T. Classen M. Cunningham J. Deaven D. L. Duke I. Ferguson J. Gearhart V. Geppert-Kleinrath U. Greife S. Grimes E. Guardincerri U. Hager C. Hagmann M. Heffner D. Hensle N. Hertel D. Higgins T. Hill L. D. Isenhower J. King J. L. Klay N. Kornilov R. Kudo A. B. Laptev W. Loveland M. Lynch W. S. Lynn J. A. Magee B. Manning T. N. Massey C. McGrath R. Meharchand M. P. Mendenhall L. Montoya N. T. Pickle H. Qu J. Ruz S. Sangiorgio K. T. Schmitt B. Seilhan S. Sharma L. Snyder S. Stave A. C. Tate G. Tatishvili R.T. Thornton F. Tovesson D. E. Towell R. S. Towell N. Walsh S. Watson B. Wendt L. Wood L. Yao W. Younes

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classification ⚛️ nucl-ex physics.ins-det

keywords crosssectionratiochamberfissionmeasurementneutronnormalized

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The normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber from the reaction threshold to $30$~MeV. The fissionTPC is a two-volume MICROMEGAS time projection chamber that allows for full three-dimensional reconstruction of fission-fragment ionization profiles from neutron-induced fission. The measurement was performed at the Los Alamos Neutron Science Center, where the neutron energy is determined from neutron time-of-flight. The $^{238}$U(n,f)/$^{235}$U(n,f) ratio reported here is the first cross section measurement made with the fissionTPC, and will provide new experimental data for evaluation of the $^{238}$U(n,f) cross section, an important standard used in neutron-flux measurements. Use of a development target in this work prevented the determination of an absolute normalization, to be addressed in future measurements. Instead, the measured cross section ratio has been normalized to ENDF/B-VIII.$\beta$5 at 14.5 MeV.

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Measurement of the normalized ²³⁸U(n,f)/²³⁵U(n,f) cross section ratio from threshold to 30 MeV with the fission Time Projection Chamber

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