Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on 235U

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.

doi:10.1016/j.nds.2019.01.005

Title: Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on ²³⁵U

Journal Article · Thu Jan 24 00:00:00 EST 2019 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/j.nds.2019.01.005· OSTI ID:1580022

Pierson, Bruce D. ^[1]; Prinke, A. M. ^[1]; Greenwood, L. R. ^[1]; Stave, S. C. ^[1]; Wittman, R. S. ^[1]; Burch, J. G. ^[2]; Burke, J. T. ^[2]; Padgett, S. W. ^[2]; Ressler, J. J. ^[2]; Slavik, G. ^[2]; Tamashiro, A. ^[2]; Tonchev, A. ^[2]; Younes, W. ^[2]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: AC52-07NA27344; AC05-76RL01830

OSTI ID:: 1580022

Alternate ID(s):: OSTI ID: 1501612

Report Number(s):: LLNL-JRNL-783000; PNNL-SA-132098; 970933; TRN: US2102187

Journal Information:: Nuclear Data Sheets, Vol. 155, Issue C; ISSN 0090-3752

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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