Improving nuclear data accuracy of <sup>241</sup>Am and <sup>237</sup>Np capture cross sections

Žerovnik, Gašper; Schillebeeckx, P.; Cano‐Ott, D.; Jändel, M.; Hori, Jun‐ichi; Kimura, A.; Roßbach, M.; Letourneau, A.; Noguère, G.; Leconte, Pierre; Sano, Tadafumi; Kellett, Mark A.; Iwamoto, Osamu; Ignatyuk, A.V.; Cabellos, Ó.; Genreith, Christoph; Harada, Hideo

doi:10.1051/epjconf/201714611035

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…As a consequence, it is not surprising that there are also large discrepancies among the evaluated libraries. Indeed, these discrepancies are being investigated through an international collaborative working group organized by NEA-OECD [6].…”

Section: Introductionmentioning

confidence: 99%

“…There are about 1.2 × 10 5 neutrons per nominal pulse of 7 × 10 12 protons between 0.1 eV and 10 keV reaching the irradiation position. The energy dependence of the neutron beam was determined with three different detectors [12]: a silicon flux monitor [13] (SiMon), a Micromegas gas detector [14], and a calibrated fission chamber from Physikalisch Technische Bundesanstalt (PTB) [15], which are based on the 6 Li(n,t), 10 B(n,α) and 235 U(n,f ) standard reactions [16], respectively. The first two detectors were in place during the 241 Am(n,γ ) measurement.…”

Section: Introductionmentioning

confidence: 99%

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Measurement and analysis of theAm241neutron capture cross section at the n_TOF facility at CERN

Mendoza¹,

Cano‐Ott²,

Altstadt³

et al. 2018

Phys. Rev. C

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The 241 Am(n,γ ) cross section has been measured at the n_TOF facility at CERN with the n_TOF BaF 2 Total Absorption Calorimeter in the energy range between 0.2 eV and 10 keV. Our results are analyzed as resolved resonances up to 700 eV, allowing a more detailed description of the cross section than in the current evaluations, which contain resolved resonances only up to 150-160 eV. The cross section in the unresolved resonance region is perfectly consistent with the predictions based on the average resonance parameters deduced from the resolved resonances, thus obtaining a consistent description of the cross section in the full neutron energy range under study. Below 20 eV, our results are in reasonable agreement with JEFF-3.2 as well as with the most recent direct measurements of the resonance integral, and differ up to 20-30% with other experimental data. Between 20 eV and 1 keV, the disagreement with other experimental data and evaluations gradually decreases, in general, with the neutron energy. Above 1 keV, we find compatible results with previously existing values.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement and analysis of theAm241neutron capture cross section at the n_TOF facility at CERN

Mendoza¹,

Cano‐Ott²,

Altstadt³

et al. 2018

Phys. Rev. C

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Validation of actinide nuclear data based on reactivity worth experiments in a MOX-LWR spectrum

Leconte

Antony

Archier

et al. 2020

Annals of Nuclear Energy

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A new convention for the epithermal neutron spectrum for improving accuracy of resonance integrals

2020

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A new convention for the epithermal neutron spectrum component is formulated in this work, aimed at improving the accuracy of resonance integrals determination. The (1 + β)/(βE + E1+α ) form here proposed, is an approximating function of the epithermal neutron spectrum based upon calculations performed by the state-of-art Monte Carlo code MVP-3. Bias effects on determination of resonance integrals, due to the application of the well-known and used so far approximating functions, such as 1/E, 1/E1+α as well as the new form (1 + β)/(βE + E1+α ) are compared, where E is the neutron energy, α a shape factor, and β a new shape factor introduced in this work. The other bias effect is also investigated, which is caused by neglecting the position dependence of a neutron spectrum inside an irradiation capsule. To get a demonstration of the bias effects due to these assumptions, upon the determination of a neutron spectrum from a quantitative point of view in a practical case, the thermal neutron-capture cross section and resonance integral of 135Cs measured at a research reactor JRR-3 are re-evaluated. A superior property of the proposed new mathematical expression is discussed. The experimental method is proposed to determine the new shape factor β by a combinational use of triple flux monitors (197Au, 59Co, and 94Zr), and its analytical methodology is formulated.

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Improving nuclear data accuracy of ²⁴¹Am and ²³⁷Np capture cross sections

Cited by 3 publications

References 10 publications

Measurement and analysis of theAm241neutron capture cross section at the n_TOF facility at CERN

Measurement and analysis of theAm241neutron capture cross section at the n_TOF facility at CERN

Validation of actinide nuclear data based on reactivity worth experiments in a MOX-LWR spectrum

A new convention for the epithermal neutron spectrum for improving accuracy of resonance integrals

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Improving nuclear data accuracy of 241Am and 237Np capture cross sections

Cited by 3 publications

References 10 publications

Measurement and analysis of theAm241neutron capture cross section at the n_TOF facility at CERN

Measurement and analysis of theAm241neutron capture cross section at the n_TOF facility at CERN

Validation of actinide nuclear data based on reactivity worth experiments in a MOX-LWR spectrum

A new convention for the epithermal neutron spectrum for improving accuracy of resonance integrals

Contact Info

Product

Resources

About

Improving nuclear data accuracy of ²⁴¹Am and ²³⁷Np capture cross sections