Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements

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Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements. / Zerovnik, Gasper; Schillebeeckx, Peter; Becker, Bjorn; Fiorito, Luca; Harada, Hideo; Kopecky, Stefan; Radulović, Vladimir; Samu, Tadafumi.

In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 877, 01.01.2018, p. 300-313.

Research output: Contribution to journalArticle

Harvard

Zerovnik, G, Schillebeeckx, P, Becker, B, Fiorito, L, Harada, H, Kopecky, S, Radulović, V & Samu, T 2018, 'Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 877, pp. 300-313. https://doi.org/10.1016/j.nima.2017.09.064

APA

Zerovnik, G., Schillebeeckx, P., Becker, B., Fiorito, L., Harada, H., Kopecky, S., ... Samu, T. (2018). Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 877, 300-313. https://doi.org/10.1016/j.nima.2017.09.064

Vancouver

Zerovnik G, Schillebeeckx P, Becker B, Fiorito L, Harada H, Kopecky S et al. Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2018 Jan 1;877:300-313. https://doi.org/10.1016/j.nima.2017.09.064

Author

Zerovnik, Gasper ; Schillebeeckx, Peter ; Becker, Bjorn ; Fiorito, Luca ; Harada, Hideo ; Kopecky, Stefan ; Radulović, Vladimir ; Samu, Tadafumi. / Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements. In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2018 ; Vol. 877. pp. 300-313.

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@article{d7c89175283244bd9f74a1d2fceddaf4,
title = "Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements",
abstract = "Methodologies to derive cross section data from spectrum integrated reaction rates were studied. The Westcott convention and some of its approximations were considered. Mostly measurements without and with transmission filter are combined to determine the reaction cross section at thermal energy together with the resonance integral. The accuracy of the results strongly depends on the assumptions that are made about the neutron energy distribution, which is mostly parameterised as a sum of a thermal and an epi-thermal component. Resonance integrals derived from such data can be strongly biased and should only be used in case no other data are available. The cross section at thermal energy can be biased for reaction cross sections which are dominated by low energy resonances. The amplitude of the effect is related to the lower energy limit that is used for the epi-thermal component of the neutron energy distribution. It is less affected by the assumptions on the shape of the energy distribution. When the energy dependence of the cross section is known and information about the neutron energy distribution is available, a method to correct for a bias on the cross section at thermal energy is proposed. Reactor activation measurements to determine the thermal 241Am(n,g) cross section reported in the literature were reviewed. In case enough information was available, the results were corrected to account for possible biases and included in a least squares fit. These data combined with results of time-of-flight measurements give a capture cross section 720 (14) b for 241Am(n,g) at thermal energy.",
keywords = "Neutron capture, Reactor neutron spectrum, Reaction rate, Westcott convention, Americium-241",
author = "Gasper Zerovnik and Peter Schillebeeckx and Bjorn Becker and Luca Fiorito and Hideo Harada and Stefan Kopecky and Vladimir Radulović and Tadafumi Samu",
note = "Score=10",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.nima.2017.09.064",
language = "English",
volume = "877",
pages = "300--313",
journal = "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
publisher = "Elsevier",

}

RIS - Download

TY - JOUR

T1 - Systematic effects on cross section data derived from reaction rates in reactor spectra and a re-analysis of 241Am reactor activation measurements

AU - Zerovnik, Gasper

AU - Schillebeeckx, Peter

AU - Becker, Bjorn

AU - Fiorito, Luca

AU - Harada, Hideo

AU - Kopecky, Stefan

AU - Radulović, Vladimir

AU - Samu, Tadafumi

N1 - Score=10

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Methodologies to derive cross section data from spectrum integrated reaction rates were studied. The Westcott convention and some of its approximations were considered. Mostly measurements without and with transmission filter are combined to determine the reaction cross section at thermal energy together with the resonance integral. The accuracy of the results strongly depends on the assumptions that are made about the neutron energy distribution, which is mostly parameterised as a sum of a thermal and an epi-thermal component. Resonance integrals derived from such data can be strongly biased and should only be used in case no other data are available. The cross section at thermal energy can be biased for reaction cross sections which are dominated by low energy resonances. The amplitude of the effect is related to the lower energy limit that is used for the epi-thermal component of the neutron energy distribution. It is less affected by the assumptions on the shape of the energy distribution. When the energy dependence of the cross section is known and information about the neutron energy distribution is available, a method to correct for a bias on the cross section at thermal energy is proposed. Reactor activation measurements to determine the thermal 241Am(n,g) cross section reported in the literature were reviewed. In case enough information was available, the results were corrected to account for possible biases and included in a least squares fit. These data combined with results of time-of-flight measurements give a capture cross section 720 (14) b for 241Am(n,g) at thermal energy.

AB - Methodologies to derive cross section data from spectrum integrated reaction rates were studied. The Westcott convention and some of its approximations were considered. Mostly measurements without and with transmission filter are combined to determine the reaction cross section at thermal energy together with the resonance integral. The accuracy of the results strongly depends on the assumptions that are made about the neutron energy distribution, which is mostly parameterised as a sum of a thermal and an epi-thermal component. Resonance integrals derived from such data can be strongly biased and should only be used in case no other data are available. The cross section at thermal energy can be biased for reaction cross sections which are dominated by low energy resonances. The amplitude of the effect is related to the lower energy limit that is used for the epi-thermal component of the neutron energy distribution. It is less affected by the assumptions on the shape of the energy distribution. When the energy dependence of the cross section is known and information about the neutron energy distribution is available, a method to correct for a bias on the cross section at thermal energy is proposed. Reactor activation measurements to determine the thermal 241Am(n,g) cross section reported in the literature were reviewed. In case enough information was available, the results were corrected to account for possible biases and included in a least squares fit. These data combined with results of time-of-flight measurements give a capture cross section 720 (14) b for 241Am(n,g) at thermal energy.

KW - Neutron capture

KW - Reactor neutron spectrum

KW - Reaction rate

KW - Westcott convention

KW - Americium-241

UR - https://ecm.sckcen.be/OTCS/llisapi.dll?func=ll&objAction=download&objId=35077194

U2 - 10.1016/j.nima.2017.09.064

DO - 10.1016/j.nima.2017.09.064

M3 - Article

VL - 877

SP - 300

EP - 313

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

ER -

ID: 5319603