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

Abstract

We present that the normalized 238U(n,f)/ 235U(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber (fissionTPC) 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 238U(n,f)/ 235U(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 238U(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.β5 at 14.5 MeV.

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1432964
Alternate Identifier(s):
OSTI ID: 1429130
Report Number(s):
LLNL-JRNL-733744
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1802531
Grant/Contract Number:  
AC52-07NA27344; AC52-06NA25396; NA0002921; 08-014; 00043028-00116
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Casperson, R. J., Asner, D. M., Baker, J., Baker, R. G., Barrett, J. S., Bowden, N. S., Brune, C., Bundgaard, J., Burgett, E., Cebra, D. A., Classen, T., Cunningham, M., Deaven, J., Duke, D. L., Ferguson, I., Gearhart, J., Geppert-Kleinrath, V., Greife, U., Grimes, S., Guardincerri, E., Hager, U., Hagmann, C., Heffner, M., Hensle, D., Hertel, N., Higgins, D., Hill, T., Isenhower, L. D., King, J., Klay, J. L., Kornilov, N., Kudo, R., Laptev, A. B., Loveland, W., Lynch, M., Lynn, W. S., Magee, J. A., Manning, B., Massey, T. N., McGrath, C., Meharchand, R., Mendenhall, M. P., Montoya, L., Pickle, N. T., Qu, H., Ruz, J., Sangiorgio, S., Schmitt, K. T., Seilhan, B., Sharma, S., Snyder, L., Stave, S., Tate, A. C., Tatishvili, G., Thornton, R. T., Tovesson, F., Towell, D. E., Towell, R. S., Walsh, N., Watson, S., Wendt, B., Wood, L., Yao, L., and Younes, W. Measurement of the normalized U238(n,f)/U235(n,f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.034618.
Casperson, R. J., Asner, D. M., Baker, J., Baker, R. G., Barrett, J. S., Bowden, N. S., Brune, C., Bundgaard, J., Burgett, E., Cebra, D. A., Classen, T., Cunningham, M., Deaven, J., Duke, D. L., Ferguson, I., Gearhart, J., Geppert-Kleinrath, V., Greife, U., Grimes, S., Guardincerri, E., Hager, U., Hagmann, C., Heffner, M., Hensle, D., Hertel, N., Higgins, D., Hill, T., Isenhower, L. D., King, J., Klay, J. L., Kornilov, N., Kudo, R., Laptev, A. B., Loveland, W., Lynch, M., Lynn, W. S., Magee, J. A., Manning, B., Massey, T. N., McGrath, C., Meharchand, R., Mendenhall, M. P., Montoya, L., Pickle, N. T., Qu, H., Ruz, J., Sangiorgio, S., Schmitt, K. T., Seilhan, B., Sharma, S., Snyder, L., Stave, S., Tate, A. C., Tatishvili, G., Thornton, R. T., Tovesson, F., Towell, D. E., Towell, R. S., Walsh, N., Watson, S., Wendt, B., Wood, L., Yao, L., & Younes, W. Measurement of the normalized U238(n,f)/U235(n,f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber. United States. doi:10.1103/PhysRevC.97.034618.
Casperson, R. J., Asner, D. M., Baker, J., Baker, R. G., Barrett, J. S., Bowden, N. S., Brune, C., Bundgaard, J., Burgett, E., Cebra, D. A., Classen, T., Cunningham, M., Deaven, J., Duke, D. L., Ferguson, I., Gearhart, J., Geppert-Kleinrath, V., Greife, U., Grimes, S., Guardincerri, E., Hager, U., Hagmann, C., Heffner, M., Hensle, D., Hertel, N., Higgins, D., Hill, T., Isenhower, L. D., King, J., Klay, J. L., Kornilov, N., Kudo, R., Laptev, A. B., Loveland, W., Lynch, M., Lynn, W. S., Magee, J. A., Manning, B., Massey, T. N., McGrath, C., Meharchand, R., Mendenhall, M. P., Montoya, L., Pickle, N. T., Qu, H., Ruz, J., Sangiorgio, S., Schmitt, K. T., Seilhan, B., Sharma, S., Snyder, L., Stave, S., Tate, A. C., Tatishvili, G., Thornton, R. T., Tovesson, F., Towell, D. E., Towell, R. S., Walsh, N., Watson, S., Wendt, B., Wood, L., Yao, L., and Younes, W. Fri . "Measurement of the normalized U238(n,f)/U235(n,f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber". United States. doi:10.1103/PhysRevC.97.034618. https://www.osti.gov/servlets/purl/1432964.
@article{osti_1432964,
title = {Measurement of the normalized U238(n,f)/U235(n,f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber},
author = {Casperson, R. J. and Asner, D. M. and Baker, J. and Baker, R. G. and Barrett, J. S. and Bowden, N. S. and Brune, C. and Bundgaard, J. and Burgett, E. and Cebra, D. A. and Classen, T. and Cunningham, M. and Deaven, J. and Duke, D. L. and Ferguson, I. and Gearhart, J. and Geppert-Kleinrath, V. and Greife, U. and Grimes, S. and Guardincerri, E. and Hager, U. and Hagmann, C. and Heffner, M. and Hensle, D. and Hertel, N. and Higgins, D. and Hill, T. and Isenhower, L. D. and King, J. and Klay, J. L. and Kornilov, N. and Kudo, R. and Laptev, A. B. and Loveland, W. and Lynch, M. and Lynn, W. S. and Magee, J. A. and Manning, B. and Massey, T. N. and McGrath, C. and Meharchand, R. and Mendenhall, M. P. and Montoya, L. and Pickle, N. T. and Qu, H. and Ruz, J. and Sangiorgio, S. and Schmitt, K. T. and Seilhan, B. and Sharma, S. and Snyder, L. and Stave, S. and Tate, A. C. and Tatishvili, G. and Thornton, R. T. and Tovesson, F. and Towell, D. E. and Towell, R. S. and Walsh, N. and Watson, S. and Wendt, B. and Wood, L. and Yao, L. and Younes, W.},
abstractNote = {We present that the normalized 238U(n,f)/235U(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber (fissionTPC) 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 238U(n,f)/235U(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 238U(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.β5 at 14.5 MeV.},
doi = {10.1103/PhysRevC.97.034618},
journal = {Physical Review C},
issn = {2469-9985},
number = 3,
volume = 97,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1. FIG. 1. : (Color online) Past measurements of the 238U(n,f)/235U(n,f) cross section ratio shown between 0.5− 30 MeV [11–27]. Data is compared to the ENDF/B-VIII.$β$5 [28] evaluation, shown with the evaluated uncertainty. The uncertainty at 20 MeV, the maximum value at which an uncertainty is given, is used for energiesmore » greater than that value. An expanded view of the data is shown in the inset, compared to the ENDF/B-VII.1 [29] and ENDF/B-VIII.$β$5 evaluations, indicating a recent 40% change to the 238U(n,f) cross section at 1.2 MeV.« less

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