Errors introduced in fission neutron spectrum measurements using a single reference

Kelly, K. J.; Devlin, M.; O’Donnell, J. M.; Neudecker, Denise; Bennett, E. A.

doi:10.1016/j.nima.2021.165552

Cited by 6 publications

(12 citation statements)

References 16 publications

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“…following references [9,43,52]. The key difference here is that the multiple-scattering and attenuation correction merge with the neutron-detection efficiency to an environmental detector-response matrix, R, of the TOF measurement, while the variable û encompasses all other corrections mentioned above and is not written out explicitly.…”

Section: Pfns Shape Measurementsmentioning

confidence: 99%

“…Due to that, ε is expected to cancel. However, reference [43] shows that differing χ s and χ m create a difference in the total distortion (from down scattering mainly) observed for each E out . As the response contains ε and m, this difference is accounted for here in m in order to remain with the simplified notation.…”

Section: Pfns Clean-ratio Shape Measurementsmentioning

confidence: 99%

“…In clean-ratio shape measurements, m reduces to the different response of χ s compared to χ m to this effect. If χ s and χ m are very similar, m and, hence, δm can become small [23,24,43]. If χ s and χ m differ significantly, a systematic bias can amount to a value of a few percent across the majority of the PFNS range, with corrections on the order of 10% or more possible near pre-equilibrium neutron emission regions [43].…”

Section: Multiple-scattering and Attenuation Uncertaintiesmentioning

confidence: 99%

“…If χ s and χ m are very similar, m and, hence, δm can become small [23,24,43]. If χ s and χ m differ significantly, a systematic bias can amount to a value of a few percent across the majority of the PFNS range, with corrections on the order of 10% or more possible near pre-equilibrium neutron emission regions [43]. If an m = 1 due to systematic differences of χ s and χ m is not corrected for, δm would assume this value.…”

Section: Multiple-scattering and Attenuation Uncertaintiesmentioning

confidence: 99%

“…Chapter III.M of reference [1], (b) the detailed uncertainty analysis [7][8][9] of several 235,238 U and 239 Pu PFNS experimental data using their respective literature and EXFOR entries [35][36][37], as well as (c) uncertainty studies undertaken by the Chi-Nu team as part of their measurement campaign [13,[38][39][40][41][42][43]. After the initial establishment of the templates, a sub-set of the authors reviewed 252 Cf PFNS measurements; some of the knowledge, gained from references [6,[44][45][46], was added to this manuscript.…”

Section: Introductionmentioning

confidence: 99%

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Templates of expected measurement uncertainties for prompt fission neutron spectra

Neudecker,

Devlin,

Haight

et al. 2023

EPJ Nuclear Sci. Technol.

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In this paper, we provide templates of uncertainty sources expected to appear for three measurement types of prompt fission neutron spectra (PFNS): (1) shape measurements, (2) clean-ratio shape, that is the monitor PFNS are measured in nearly exactly the same surrounding as the PFNS of interest, and (3) indirect ratios, where the detector efficiency is backed out from PFNS monitor measurements. Information is also listed that is needed to faithfully include PFNS in nuclear data evaluations to guide experimenters on how to best report data and metadata for their measurements. These templates also suggest a typical range of pertinent uncertainty values and their correlations in case realistic uncertainties cannot be estimated from information on the measurement itself. The templates were based on a literature review, information found in EXFOR for 252Cf, 235, 238U, and 239Pu PFNS, and enhanced by expertise from experimenters contributing to these PFNS templates.

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Section: Pfns Shape Measurementsmentioning

confidence: 99%

Section: Pfns Clean-ratio Shape Measurementsmentioning

confidence: 99%

Section: Multiple-scattering and Attenuation Uncertaintiesmentioning

confidence: 99%

Section: Multiple-scattering and Attenuation Uncertaintiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Templates of expected measurement uncertainties for prompt fission neutron spectra

Neudecker,

Devlin,

Haight

et al. 2023

EPJ Nuclear Sci. Technol.

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The Neutron Scattering Cross Section and Angular Distribution Measurement Program at LANL

et al. 2023

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Neutron scattering cross sections and angular distributions are leading terms in descriptions of neutron transport through any system. Despite the fundamental importance of nuclear data on these quantities, significant gaps in understanding and lack of experimental data persist in heavier elements and down to lighter structural materials, such as iron and aluminum. Recent measurements on carbon have also shown definitive proof that the neutron angular distribution can change with respect to the emission angle of γ-rays from inelastic scattering, thereby complicating γ-tagged measurements of inelastic neutron scattering. In this work, we describe the emerging program at Los Alamos National Laboratory for measurements of neutron scattering cross sections and neutron, γ-ray, and correlated n-γ angular distributions utilizing liquid scintillator detectors and the Correlated Gamma-Neutron Array for Scattering (CoGNAC) of CLYC scintillators. Currently, these detectors are operated simultaneously with the in-progress array of CLYC detectors in an inverted position, and data analysis techniques are being developed to span scattering measurements from light nuclei up through actinides. Preliminary results for measurements on 12C, 27Al, and 56Fe are presented here with a description of the analysis methods applied and anticipated capabilities of the full-scale detection system.

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Measurement of the U235(n,f) prompt fission neutron spectrum from 10 keV to 10 MeV induced by neutrons of energy from 1 MeV to 20 MeV

et al. 2022

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Errors introduced in fission neutron spectrum measurements using a single reference

Cited by 6 publications

References 16 publications

Templates of expected measurement uncertainties for prompt fission neutron spectra

Templates of expected measurement uncertainties for prompt fission neutron spectra

The Neutron Scattering Cross Section and Angular Distribution Measurement Program at LANL

Measurement of the U235(n,f) prompt fission neutron spectrum from 10 keV to 10 MeV induced by neutrons of energy from 1 MeV to 20 MeV

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