Nuclear data activities at the n_TOF facility at CERN

Gunsing, F.; Aberle, O.; Andrzejewski, J.; Audouin, L.; Bécares, V.; Bacak, M.; Balibrea, J.; Barbagallo, M.; Barros, S.; Bečvář, F.; Beinrucker, C.; Belloni, F.; Berthoumieux, E.; Billowes, J.; Bosnar, D.; Brügger, M.; Caamaño, M.; Calviño, F.; Calviani, M.; Cano‐Ott, D.; Cardella, R.; Casanovas, A.; Castelluccio, Donato Maurizio; Cerutti, F.; Chen, Y. H.; Chiaveri, E.; Colonna, N.; Cortés‐Giraldo, M. A.; Cortés, G.; Coséntino, L.; Damone, L. A.; Deo, K.; Diakaki, Μ.; Domingo‐Pardo, C.; Dressler, R.; Dupont, E.; Durán, I.; Fernández–Domínguez, B.; Ferrari, A.; Ferreira, Paulo Ricardo Araújo; Finocchiaro, P.; Frost, R.J.W.; Furman, V.; Ganesan, S.; García, A. R.; Gawlik, A.; Gheorghe, I.; Glodariu, T.; Gonçalves, I. F.; González, Enrique; Goverdovski, A.; Griesmayer, E.; Guerrero, C.; Göbel, K.; Harada, Hideo; Heftrich, T.; Heinitz, S.; Hernández-Prieto, A.; Heyse, J.; Jenkins, D. G.; Jericha, E.; Käppeler, F.; Kadi, Y.; Katabuchi, Tatsuya; Kavrigin, P.; Ketlerov, V.; Khryachkov, V.; Kimura, A.; Kivel, N.; Kokkoris, M.; Krtička, M.; Leal-Cidoncha, E.; Lederer, C.; Leeb, H.; Lerendegui, J.; Licata, M.; Meo, S. Lo; Lonsdale, S. J.; Losito, R.; Macina, D.; Marganiec, J.; Martínez, T.; Masi, A.; Massimi, C.; Mastinu, P.; Mastromarco, M.; Matteuccí, F.; Maugeri, E. A.; Mazzone, A.; Mendoza, E.; Mengoni, A.; Milazzo, Paolo; Mingrone, F.; Mirea, M.; Montesano, S.; Musumarra, A.; Nolte, Roeland J. M.; Oprea, A.; Pinto, Rogelio Palomo; Paradela, C.; Patronis, N.; Pavlik, A.; Perkowski, J.; Porras, I.; Praena, J.; Quesada, J. M.; Rajeev, K. P.; Rauscher, T.; Reifarth, R.; Riego, A.; Robles, M.; Rout, P. C.; Radeck, D.; Rubbia, C.; Ryan, J. A.; Sabaté-Gilarte, M.; Saxena, A.; Schillebeeckx, P.; Schmidt, S.; Schumann, D.; Sedyshev, P.; Smith, A. G.; Stamatopoulos, A.; Suryanarayana, S. V.; Tagliente, G.; Taín, J. L.; Tarifeño-Saldivia, A.; Tarrío, D.; Tassan‐Got, L.; Tsinganis, A.; Valenta, S.; Vannini, G.; Variale, V.; Vaz, P.; Ventura, A.; Vlachoudis, V.; Vlastou, R.; Wallner, A.; Warren, S.; Weigand, M.; Weiß, C.; Wolf, C.; Woods, P. J.; Wright, T.; Žugec, P.

doi:10.1140/epjp/i2016-16371-4

Cited by 33 publications

(24 citation statements)

References 121 publications

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“…The 235 U(n, γ ) experiment was carried out in EAR-1, the horizontal beam line situated at 185 m from the target. Here the high instantaneous neutron intensity and wide energy range combined with the state-ofthe-art detectors have provided a large number of high-quality neutron-induced cross-section measurements in the last two decades [33].…”

Section: A the N_tof Facility At Cernmentioning

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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Section: A the N_tof Facility At Cernmentioning

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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“…For a full list with references, see Ref. [5]. One of the major issues to overcome is the availability of radioactive samples in a suitable form for neutron time-of-flight measurements [8,9].…”

Section: Nuclear Data Measurements At N Tofmentioning

confidence: 99%

“…[5], Table 1 summarizes the measurements performed in both EAR1 and EAR2 in 2014, 2015 and 2016. Additional references for the fission programme can also be found in Ref.…”

Section: Nuclear Data Measurements At N Tofmentioning

confidence: 99%

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The measurement programme at the neutron time-of-flight facility n_TOF at CERN

Gunsing¹,

Aberle²,

Andrzejewski³

et al. 2017

EPJ Web Conf.

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Abstract. Neutron-induced reaction cross sections are important for a wide variety of research fields ranging from the study of nuclear level densities, nucleosynthesis to applications of nuclear technology like design, and criticality and safety assessment of existing and future nuclear reactors, radiation dosimetry, medical applications, nuclear waste transmutation, accelerator-driven systems and fuel cycle investigations. Simulations and calculations of nuclear technology applications largely rely on evaluated nuclear data libraries. The evaluations in these libraries are based both on experimental data and theoretical models. CERN's neutron time-of-flight facility n TOF has produced a considerable amount of experimental data since it has become fully operational with the start of its scientific measurement programme in 2001. While for a long period a single measurement station (EAR1) located at 185 m from the neutron production target was available, the construction of a second beam line at 20 m (EAR2) in 2014 has substantially increased the measurement capabilities of the facility. An outline of the experimental nuclear data activities at n TOF will be presented.

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“…Both experimental areas are classified as Class-A laboratories, i.e. capable of dealing with unsealed samples [19,20].…”

Section: Introduction: the N_tof Facility At Cernmentioning

confidence: 99%

Design of the third-generation neutron spallation target for the CERN’s n_TOF facility

Esposito

Calviani

2020

JNR

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The neutron Time-Of-Flight (n_TOF) facility at the European Laboratory for Particle Physics (CERN) is a pulsed white-spectrum neutron spallation source producing neutrons for two experimental areas: EAR1, located 185 m downstream of the spallation target, and EAR2, located 20 m above the target. The facility is based on a lead target impacted by a high-intensity 20 GeV/c proton beam. It is designed to study neutron-nucleus interactions for neutron kinetic energies from a few meV to several GeV, with applications in nuclear astrophysics, nuclear technology, and medical research. The facility is undergoing a major upgrade in 2019–2020, which will include the installation of the new third-generation target. The second-generation target consists in a water-cooled lead cylinder, while the new target will be cooled by nitrogen to avoid erosion-corrosion phenomena and contamination of the cooling water with radioactive lead spallation products. The new design will be optimized also for the vertical flight path. The operation of the new spallation target will start in 2021. This paper presents an overview on the evolution of the design and on the related R&D activities (including beam irradiation tests) carried out to ensure the best performance for both experimental areas and avoid the contamination issues of the previous targets.

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Nuclear data activities at the n_TOF facility at CERN

Cited by 33 publications

References 121 publications

Measurement of the α ratio and (n,γ) cross section of U235
Balibrea¹,
Cembranos²,
Cano‐Ott³
et al. 2020
Phys. Rev. C
Self Cite
4
0
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0
View full text Add to dashboard Cite

Measurement of the α ratio and (n,γ) cross section of U235
Balibrea¹,
Cembranos²,
Cano‐Ott³
et al. 2020
Phys. Rev. C
Self Cite
4
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0
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The measurement programme at the neutron time-of-flight facility n_TOF at CERN

Design of the third-generation neutron spallation target for the CERN’s n_TOF facility

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Nuclear data activities at the n_TOF facility at CERN

Cited by 33 publications

References 121 publications

Measurement of the α ratio and (n,γ) cross section of U235Balibrea1, Cembranos2, Cano‐Ott3 et al. 2020Phys. Rev. CSelf Cite4000View full textAdd to dashboardCite

Measurement of the α ratio and (n,γ) cross section of U235Balibrea1, Cembranos2, Cano‐Ott3 et al. 2020Phys. Rev. CSelf Cite4000View full textAdd to dashboardCite

The measurement programme at the neutron time-of-flight facility n_TOF at CERN

Design of the third-generation neutron spallation target for the CERN’s n_TOF facility

Contact Info

Product

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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
4
0
0
0
View full text Add to dashboard Cite

Measurement of the α ratio and (n,γ) cross section of U235
Balibrea¹,
Cembranos²,
Cano‐Ott³
et al. 2020
Phys. Rev. C
Self Cite
4
0
0
0
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