Measurement and analysis of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Am</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>243</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>neutron capture cross section at the n_TOF facility at CERN

Mendoza, E.; Cano‐Ott, D.; Guerrero, C.; Berthoumieux, E.; Abbondanno, U.; Aerts, G.; Álvarez‐Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Badurek, G.; Balibrea, J.; Baumann, P.; Bečvář, F.; Belloni, F.; Calviño, F.; Calviani, M.; Capote, R.; Carrapiço, C.; Albornoz, A. Carrillo de; Cennini, P.; Chepel, V.; Chiaveri, E.; Colonna, N.; Cortés, G.; Couture, A.; Cox, James W.; Dahlfors, M.; David, S.; Dillmann, I.; Dolfini, R.; Domingo‐Pardo, C.; Dridi, W.; Durán, I.; Eleftheriadis, C.; Ferrant, L.; Ferrari, A.; Ferreira‐Marques, R.; Fitzpatrick, L.; Frais‐Köelbl, H.; Fujii, K.; Furman, W.; Gonçalves, I. F.; González‐Romero, E.; Goverdovski, A.; Gramegna, F.; Griesmayer, E.; Gunsing, F.; Haas, Brian J.; Haight, R. C.; Heil, M.; Herrera-Martı́nez, A.; Igashira, M.; Isaev, S.; Jericha, E.; Käppeler, F.; Kadi, Y.; Karadimos, D.; Karamanis, D.; Ketlerov, V.; Kerveno, M.; Koehler, P.; Konovalov, V.; Kossionides, E.; Krtička, M.; Lampoudis, C.; Leeb, H.; Lindote, A.; Meo, S. Lo; Lopes, I.; Lossito, R.; Lozano, M.; Lukić, S.; Marganiec, J.; Marques, L.; Marrone, S.; Martínez, T.; Massimi, C.; Mastinu, P.; Mengoni, A.; Milazzo, Paolo; Moreau, C.; Mosconi, M.; Neves, F.; Oberhummer, H.; O’Brien, S.; Oshima, M.; Pancin, J.; Papachristodoulou, C.; Papadopoulos, C.; Paradela, C.; Patronis, N.; Pavlik, A.; Pavlopoulos, P.; Perrot, L.; Pigni, Marco T.; Plag, R.; Plompen, A.; Plukis, A.; Poch, A.; Praena, J.; Pretel, C.; Quesada, J. M.; Rauscher, T.; Reifarth, R.; Rubbia, C.; Rudolf, G.; Rullhusen, P.; Salgado, J.; Santos, C.; Sarchiapone, L.; Savvidis, I.; Stéphan, C.; Tagliente, G.; Taín, J. L.; Tassan‐Got, L.; Tavora, L.; Terlizzi, R.; Vannini, G.; Vaz, P.; Ventura, A.; Villamarı́n, D.; Vicente, M. C.; Vlachoudis, V.; Vlastou, R.; Voß, F.; Walter, S.; Wendler, H.; Wiescher, M.; Wisshak, K.

doi:10.1103/physrevc.90.034608

Cited by 28 publications

(6 citation statements)

References 45 publications

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“…This value is significantly smaller than in previously used actinide targets at n_TOF (see, for instance, Refs. [27][28][29]) and results in a reduced neutron capture and scattering associated background.…”

Section: B 242 Pu and Ancillary Measurementsmentioning

confidence: 99%

Radiative neutron capture on Pu242 in the resonance region at the CERN n_TOF-EAR1 facility

Lerendegui-Marco¹,

Guerrero²,

Mendoza³

et al. 2018

Phys. Rev. C

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The spent fuel of current nuclear reactors contains fissile plutonium isotopes that can be combined with uranium to make mixed oxide (MOX) fuel. In this way the Pu from spent fuel is used in a new reactor cycle, contributing to the long-term sustainability of nuclear energy. However, an extensive use of MOX fuels, in particular in fast reactors, requires more accurate capture and fission cross sections for some Pu isotopes. In the case of 242 Pu there are sizable discrepancies among the existing capture cross-section measurements included in the evaluations (all from the 1970s) resulting in an uncertainty as high as 35% in the fast energy region. Moreover, postirradiation experiments evaluated with JEFF-3.1 indicate an overestimation of 14% in the capture cross section in the fast neutron energy region. In this context, the Nuclear Energy Agency (NEA) requested an accuracy of 8% in this cross section in the energy region between 500 meV and 500 keV. This paper presents a new time-of-flight capture measurement on 242 Pu carried out at n_TOF-EAR1 (CERN), focusing on the analysis and statistical properties of the resonance region, below 4 keV. The 242 Pu(n,γ) reaction on a sample containing 95(4) mg enriched to 99.959% was measured with an array of four C 6 D 6 detectors and applying the total energy detection technique. The high neutron energy resolution of n_TOF-EAR1 and the good statistics accumulated have allowed us to extend the resonance analysis up to 4 keV, obtaining new individual and average resonance parameters from a capture cross section featuring a systematic uncertainty of 5%, fulfilling the request of the NEA.

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Section: B 242 Pu and Ancillary Measurementsmentioning

confidence: 99%

Radiative neutron capture on Pu242 in the resonance region at the CERN n_TOF-EAR1 facility

Lerendegui-Marco¹,

Guerrero²,

Mendoza³

et al. 2018

Phys. Rev. C

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“…Other analyses performed with the TAC, although without fission tagging detectors, can be found in Refs. [41][42][43][44][45], and the previous test with fission tagging in Ref. [19].…”

Section: Data Reductionmentioning

confidence: 99%

Measurement of the α ratio and (n,γ) cross section of U235
Balibrea¹,
Cembranos²,
Cano‐Ott³
et al. 2020
Phys. Rev. C
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We measured the neutron capture-to-fission cross-section ratio (α ratio) and the capture cross section of 235 U between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF 2 Total Absorption Calorimeter (TAC), used for detection of γ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the 6 Li(n, t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the 235 U(n, f) cross section between 7.8 and 11 eV was then used for its absolute normalization. The α ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of 235 U performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV.

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“…The data reduction process is similar to the one applied for previous measurements performed with the TAC [30][31][32]. γ Al(n, 27 FIG.…”

Section: Data Reductionmentioning

confidence: 99%

“…For the estimation of the uncertainties in the detection efficiencies two main components were considered, as described in Refs. [38][39][40]: one related to the generation of capture cascades and other related to the uncertainties of the TAC geometry. The first component was estimated by performing multiple simulations with different EM deexcitation patterns for the capture cascades and observing when the simulated spectra deviate from the experimental data.…”

Section: B Detection Efficiencymentioning

confidence: 99%

“…However, the smallest resonances are usually not detected (missing resonances), and their number has to be estimated as well. This was done by assuming that the values of the reduced [31], it follows that, for a given energy interval, the number of resonances with g 0 n greater than a certain value, x, can be obtained from…”

Section: A Analysis Of the Resolved Resonance Regionmentioning

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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Measurement and analysis of theAm243neutron capture cross section at the n_TOF facility at CERN

Cited by 28 publications

References 45 publications

Radiative neutron capture on Pu242 in the resonance region at the CERN n_TOF-EAR1 facility

Radiative neutron capture on Pu242 in the resonance region at the CERN n_TOF-EAR1 facility

Measurement of the α ratio and (n,γ) cross section of U235
Balibrea¹,
Cembranos²,
Cano‐Ott³
et al. 2020
Phys. Rev. C
Self Cite
3
0
0
0
View full text Add to dashboard Cite

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

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Measurement and analysis of theAm243neutron capture cross section at the n_TOF facility at CERN

Cited by 28 publications

References 45 publications

Radiative neutron capture on Pu242 in the resonance region at the CERN n_TOF-EAR1 facility

Radiative neutron capture on Pu242 in the resonance region at the CERN n_TOF-EAR1 facility

Measurement of the α ratio and (n,γ) cross section of U235Balibrea1, Cembranos2, Cano‐Ott3 et al. 2020Phys. Rev. CSelf Cite3000View full textAdd to dashboardCite

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

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Measurement of the α ratio and (n,γ) cross section of U235
Balibrea¹,
Cembranos²,
Cano‐Ott³
et al. 2020
Phys. Rev. C
Self Cite
3
0
0
0
View full text Add to dashboard Cite