<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ta</mml:mi><mml:mprescripts /><mml:none /><mml:mn>181</mml:mn></mml:mmultiscripts></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi></mml:mrow></mml:math>) cross section and average resonance parameter measurements in the unresolved resonance region from 24 to 1180 keV using a filtered-beam technique

McDermott, B.; Blain, E.; Daskalakis, A.; Thompson, Nicholas; Youmans, A.; Choun, Hyung Jin; Steinberger, William M.; Danon, Y.; Barry, D. P.; Block, Robert C.; Epping, Brian; Leinweber, G.; Rapp, M. J.

doi:10.1103/physrevc.96.014607

Cited by 13 publications

(8 citation statements)

References 17 publications

(27 reference statements)

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“…Monitor reactions are commonly used in offline measurements and provide a measurement of the overall irradiation fluence. In the thermal region, 197 Au and 94 Zr are common monitors [6,7,23], and in the RRR smooth cross sections like 10 B(n, α) and 6 Li(n, t) are used [22,24].…”

Section: Common Characteristicsmentioning

confidence: 99%

“…C 6 D 6 detector systems have been used at many facilities, including RPI [24], the Geel Electron LINear Accelerator (GELINA) [57], CERN [58], KURRI [59], and ORELA [60], and NaI systems have been used at J-PARC [61]. Sample characteristics.…”

Section: Total Energy Detectionmentioning

confidence: 99%

“…Flux normalization. Normalization of the count rates into capture yields is similar to TAS measurements, often using a saturated resonance in the isotope being measured [24] or in 197 Au [67], or by simultaneous fitting of transmission and capture yield data [51].…”

Section: Total Energy Detectionmentioning

confidence: 99%

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Templates of expected measurement uncertainties for neutron-induced capture and charged-particle production cross section observables

Lewis,

Neudecker,

Carlson

et al. 2023

EPJ Nuclear Sci. Technol.

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This paper provides a template of expected uncertainties and correlations for measurements of neutron-induced capture and charged-particle production cross sections. Measurements performed in-beam include total absorption spectroscopy, total energy detection, γ-ray spectroscopy, and direct charged-particle detection. Offline measurements include activation analysis and accelerator mass spectrometry. The information needed for proper use of the datasets in resonance region and high energy region evaluations is described, and recommended uncertainties are provided when specific values are not available for a dataset.

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Section: Common Characteristicsmentioning

confidence: 99%

Section: Total Energy Detectionmentioning

confidence: 99%

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Templates of expected measurement uncertainties for neutron-induced capture and charged-particle production cross section observables

Lewis,

Neudecker,

Carlson

et al. 2023

EPJ Nuclear Sci. Technol.

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“…The iron filter method was also used for background reduction in TOF capture measurements of 181 Ta [6] in the unresolved resonance range. In the case of 181 Ta, the level density is sufficiently high that each filter peak compass many resonances and thus provides a good statistical average.…”

Section: Background Reductionmentioning

confidence: 99%

“…Neutron capture cross section of 181 Ta measured with an iron filtered beam compared with an unfiltered measurement and different evaluations[6].…”

mentioning

confidence: 99%

Innovative experiments for reduction of nuclear data uncertainty

Danon

2018

EPJ Nuclear Sci. Technol.

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Due to the complexity of nuclear reaction models, current nuclear data evaluations must rely on experimental observations to constrain models and provide the accuracy needed for applications. For criticality applications, the accuracy of nuclear data needed is higher than what is currently possible from differential experiments alone, and integral measurements are often used for data adjustment within the uncertainties of differential experiments. This approach does not necessarily result in physically correct cross sections or other adjusted quantities because compensation between different materials is hard to avoid. One of the objectives of the recent CIELO project [M. Chadwick et al., Nucl. Data Sheets 118, 1 (2014)] was simultaneous evaluation of important materials in an attempt to minimize the effects of compensation. Improvement to the evaluation process depends on obtaining new experimental data with high accuracy and lower uncertainty that will help constrain the evaluations for certain important reactions. Improved experiments are accomplished by careful design with the objective of achieving high accuracy and lower uncertainty, and by designing new innovative experiments. New and unconventional experiments do not necessarily provide differential data but instead nuclear data that evaluators will find useful to constrain the evaluation and reduce the uncertainty. This also means that closer information exchange and collaboration between experimentalists and evaluators is important. For conventional experiments such as neutron transmission or capture measurements, it is important to understand the sources of uncertainty and address them in the experiment design. Such a process can also lead to the design of innovative methods. For example, the filtered beam method minimizes uncertainties due to background, and the Quasi-Differential Neutron Scattering method simplifies the experiment and data analysis and results in lower experimental uncertainty. A review of the sources of uncertainty in various experiments and examples of experimental techniques that help reduce experimental and evaluation uncertainty and increase accuracy will be discussed.

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