Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on 235U
Abstract
Two isotopically-characterized targets of high-purity (99.84±0.03%) 235U-oxide and a neutron dosimetry package were exposed to a pulsed neutron irradiation using the Godiva critical assembly at the National Criticality Experiments Research Center. Following irradiation, the fissioned targets were counted with a broad-energy germanium detector. Estimates of the total fissions for each target were made using measurements of well-known fission products. The total fission values were then used to measure the fission yields of 21 fission products with half-lives between 636 and 119,700 seconds. Mean values of seventeen of the measured fission products fell within the 95% confidence level of the Evaluated Nuclear Data Files VII.1/b (ENDF/B-VII.1) using the larger of the two uncertainties: 84gBr, 89Rb, 91Sr, 93Y, 97Zr, 101Mo, 105Ru, 128Sn, 129Sb, 130gSb, 131Sb, 131mTe, 133I, 135I, 141Ba, 142Ba, and 142La. Seven isotopes were measured to better precision than is listed in the ENDF/B-VII.1 database: 89Rb, 93Y, 128Sn, 129Sb, 130gSb, 131mTe, and 133I. Four of the measured isotopes were found to be statistically different from the ENDF/B-VII.1 database: 94Y, 134Te, 134I, and 138Xe. Two of the isotopic analyses conducted in this paper fit the parent and daughter data simultaneously. The parent-daughter pairs measured in this way were the 134Te/I and 142Ba/Lamore »
- Authors:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- OSTI Identifier:
- 1580022
- Alternate Identifier(s):
- OSTI ID: 1501612
- Report Number(s):
- LLNL-JRNL-783000; PNNL-SA-132098
Journal ID: ISSN 0090-3752; 970933; TRN: US2102187
- Grant/Contract Number:
- AC52-07NA27344; AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Data Sheets
- Additional Journal Information:
- Journal Volume: 155; Journal Issue: C; Journal ID: ISSN 0090-3752
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 42 ENGINEERING
Citation Formats
Pierson, Bruce D., Prinke, A. M., Greenwood, L. R., Stave, S. C., Wittman, R. S., Burch, J. G., Burke, J. T., Padgett, S. W., Ressler, J. J., Slavik, G., Tamashiro, A., Tonchev, A., and Younes, W. Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on 235U. United States: N. p., 2019.
Web. doi:10.1016/j.nds.2019.01.005.
Pierson, Bruce D., Prinke, A. M., Greenwood, L. R., Stave, S. C., Wittman, R. S., Burch, J. G., Burke, J. T., Padgett, S. W., Ressler, J. J., Slavik, G., Tamashiro, A., Tonchev, A., & Younes, W. Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on 235U. United States. https://doi.org/10.1016/j.nds.2019.01.005
Pierson, Bruce D., Prinke, A. M., Greenwood, L. R., Stave, S. C., Wittman, R. S., Burch, J. G., Burke, J. T., Padgett, S. W., Ressler, J. J., Slavik, G., Tamashiro, A., Tonchev, A., and Younes, W. Thu .
"Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on 235U". United States. https://doi.org/10.1016/j.nds.2019.01.005. https://www.osti.gov/servlets/purl/1580022.
@article{osti_1580022,
title = {Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on 235U},
author = {Pierson, Bruce D. and Prinke, A. M. and Greenwood, L. R. and Stave, S. C. and Wittman, R. S. and Burch, J. G. and Burke, J. T. and Padgett, S. W. and Ressler, J. J. and Slavik, G. and Tamashiro, A. and Tonchev, A. and Younes, W.},
abstractNote = {Two isotopically-characterized targets of high-purity (99.84±0.03%) 235U-oxide and a neutron dosimetry package were exposed to a pulsed neutron irradiation using the Godiva critical assembly at the National Criticality Experiments Research Center. Following irradiation, the fissioned targets were counted with a broad-energy germanium detector. Estimates of the total fissions for each target were made using measurements of well-known fission products. The total fission values were then used to measure the fission yields of 21 fission products with half-lives between 636 and 119,700 seconds. Mean values of seventeen of the measured fission products fell within the 95% confidence level of the Evaluated Nuclear Data Files VII.1/b (ENDF/B-VII.1) using the larger of the two uncertainties: 84gBr, 89Rb, 91Sr, 93Y, 97Zr, 101Mo, 105Ru, 128Sn, 129Sb, 130gSb, 131Sb, 131mTe, 133I, 135I, 141Ba, 142Ba, and 142La. Seven isotopes were measured to better precision than is listed in the ENDF/B-VII.1 database: 89Rb, 93Y, 128Sn, 129Sb, 130gSb, 131mTe, and 133I. Four of the measured isotopes were found to be statistically different from the ENDF/B-VII.1 database: 94Y, 134Te, 134I, and 138Xe. Two of the isotopic analyses conducted in this paper fit the parent and daughter data simultaneously. The parent-daughter pairs measured in this way were the 134Te/I and 142Ba/La pairs. The fission yield results obtained in this way are unique, especially for 134I, because the parent and daughter half-lives are so close. Here, given the limited number of direct measurements of the 134Te/I pair from fast neutron induced fission and the seemingly high estimate for 134Te from previous work, it is likely that the value in this paper is more accurate; however, additional measurements of this pair are needed to validate this assertion.},
doi = {10.1016/j.nds.2019.01.005},
journal = {Nuclear Data Sheets},
number = C,
volume = 155,
place = {United States},
year = {Thu Jan 24 00:00:00 EST 2019},
month = {Thu Jan 24 00:00:00 EST 2019}
}
Web of Science
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