Fission Product Data Measured at Los Alamos for Fission Spectrum and Thermal Neutrons on 239Pu, 235U, 238U

Selby, Hugh D.; Innes, M. R. Mac; Barr, D.; Keksis, A.; Meade, Roger Allen; Burns, Carol J.; Chadwick, M.B.; Wallstrom, Timothy C.

doi:10.1016/j.nds.2010.11.002

Cited by 52 publications

(19 citation statements)

References 27 publications

(66 reference statements)

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“…Very recently, this finding was confirmed by Gooden et al [5] using mono-energetic neutron beams, as opposed to the white neutrons of Refs. [1][2][3]. The data of Gooden et al [5] extended the positive slope to at least 5 MeV neutron energy.…”

Section: Introductionmentioning

confidence: 89%

“…Using continuous-energy neutrons produced in critical assemblies and fast reactors, the fission product yield (FPY) of 239 Pu has been reported by Selby et al [1] and Maeck et al [2]. The data presented for the highyield fission fragment 147 Nd in the neutron energy range between 0.2 and 1.9 MeV were evaluated by Chadwick et al [3] and Thompson et al [4].…”

Section: Introductionmentioning

confidence: 99%

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Exploratory study of fission product yield determination from photofission of Pu239 at 11 MeV with monoenergetic photons

et al. 2017

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Exploratory study of fission product yield determination from photofission of Pu239 at 11 MeV with monoenergetic photons

et al. 2017

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“…In Chapter 6, the results of the current fission product yield measurements will be compared to a number of evaluated data sets (ENDF/B-VII.1, England & Rider [6], JENDL [7]), as well as a limited number of experimental results, see Refs. [8,9,10,11].…”

Section: Status Of Existing Datamentioning

confidence: 99%

Energy Dependence of Fission Product Yields from 235U, 238U and 239Pu for Incident Neutron Energies Between 0.5 and 14.8 MeV

Gooden

Arnold

Becker

et al. 2016

Nuclear Data Sheets

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has performed a set of absolute Fission Product Yield (FPY) measurements. Using monoenergetic neutron at energies between 0.5 and 14.8 MeV, the excitation functions of a number of fission products from 235 U, 238 U and 239 Pu have begun to be mapped out. This work has practical applications for the determination of weapon yields and the rate of burn-up in nuclear reactors, while also providing important insight into the fission process. Combining the use of a dual-fission ionization chamber and-ray spectroscopy, absolute FPYs have been determined for approximately 15 di↵erent fission products. The dual-fission chamber is a back-to-back ionization chamber system with a 'thin' actinide foil in each chamber as a monitor or reference foil. The chamber holds a 'thick' target in the center of the system such that the target and reference foils are of the same actinide isotope. This allows for simple mass scaling between the recorded number of fissions in the individual chambers and the number of fissions in the center thick target, eliminating the need for the knowledge of the absolute fission cross section and its uncertainty. The 'thick' target was removed after activation and-rays counted with well shielded High Purity Germanium (HPGe) detectors for a period of 1.5-2 months.

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“…During the 1940s and 1950s, Los Alamos developed an accurate measurement of uranium-235 fissions that has been the basis for almost our entire measurement history [19,20]. Most reactions were measured in ratio to uranium-235 fissions by way of molybdenum-99 beta counting.…”

Section: Early History Of Los Alamos Critical Assembly Experimentsmentioning

confidence: 99%

Validation of nuclear data using historical critical assembly measurements

White

2017

EPJ Web Conf.

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Abstract. Predictive neutronics simulations depend on accurate nuclear data. We use integral experiments of near critical assemblies as one of the key validation experiments. The accuracy of these measurements is such that they are more constraining to a nuclear data evaluation than the underlying differential data. But the solutions found in calibrating to these benchmarks are degenerate and other data are necessary to discern which is correct. Recently, we have begun to use activation data for this purpose. This paper describes many of the early Los Alamos experiments that are used in this process, with particular attention given to some of the systematic errors that affect these measurements.

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Fission Product Data Measured at Los Alamos for Fission Spectrum and Thermal Neutrons on 239Pu, 235U, 238U

Cited by 52 publications

References 27 publications

Exploratory study of fission product yield determination from photofission of Pu239 at 11 MeV with monoenergetic photons

Exploratory study of fission product yield determination from photofission of Pu239 at 11 MeV with monoenergetic photons

Energy Dependence of Fission Product Yields from 235U, 238U and 239Pu for Incident Neutron Energies Between 0.5 and 14.8 MeV

Validation of nuclear data using historical critical assembly measurements

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