Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>236</mml:mn></mml:msup></mml:math>U(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>f</mml:mi></mml:math>) cross section from 170 meV to 2 MeV at the CERN<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathv

Sarmento, R.; Calviani, M.; Praena, J.; Colonna, N.; Belloni, F.; Gonçalves, I. F.; Vaz, P.; Aerts, G.; Álvarez, H.; Álvarez‐Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Barbagallo, M.; Badurek, G.; Baumann, P.; Bečvář, F.; Berthoumieux, E.; Calviño, F.; Cano‐Ott, D.; Capote, R.; Carrapiço, C.; Albornoz, A. Carrillo de; Cennini, P.; Chepel, V.; Chiaveri, E.; Cortés, G.; Couture, A.; Cox, James W.; Dahlfors, M.; David, S.; Diakaki, Μ.; Dillmann, I.; Dolfini, R.; Domingo‐Pardo, C.; Dridi, W.; Durán, I.; Eleftheriadis, C.; Ferrant, L.; Ferrari, A.; Ferreira‐Marques, R.; Frais‐Köelbl, H.; Fuji, K.; Furman, W.; González‐Romero, E.; Goverdovski, A.; Gramegna, F.; Griesmayer, E.; Guerrero, C.; 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.; Kerveno, M.; Ketlerov, V.; Koehler, P.; Konovalov, V.; Kossionides, E.; Krtička, M.; Lampoudis, C.; Lederer, C.; Leeb, H.; Lindote, A.; Lopes, I.; Lozano, M.; Lukić, S.; Marganiec, J.; Marques, L.; Marrone, S.; Martínez, T.; Massimi, C.; Mastinu, P.; Mendoza, E.; 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.; Pretel, C.; Quesada, J.; Rauscher, T.; Reifarth, R.; Rosetti, M.; Rubbia, C.; Rudolf, G.; Rullhusen, P.; Salgado, J.; Sarchiapone, L.; Savvidis, I.; Stéphan, C.; Tagliente, G.; Taín, J. L.; Tarrío, D.; Tassan‐Got, L.; Tavora, L.; Terlizzi, R.; Vannini, G.; 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.84.044618

Cited by 16 publications

(6 citation statements)

References 25 publications

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“…The pulse shape analysis of the fission events was performed by fitting the signals with an exponential expression [28] using the MINUIT code [29], providing the time and amplitude for each detector signal. This pulse shape analysis 30 MeV approximately, where the undershooting and rippling of the detector baseline caused by the γ flash can be observed (dotted, gray), as well as the recovery of the baseline after the "average" subtraction (dashed, black). The first peak in the original signal represents the γ flash and the following peaks correspond to fission fragments (solid, red).…”

Section: Discussionmentioning

confidence: 99%

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Neutron-induced fission cross section ofU234measured at the CERN n_TOF facility

Karadimos¹,

Vlastou²,

Ioannidis³

et al. 2014

Phys. Rev. C

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The neutron-induced fission cross section of 234 U has been measured at the CERN n_TOF facility relative to the standard fission cross section of 235 U from 20 keV to 1.4 MeV and of 238 U from 1.4 to 200 MeV. A fast ionization chamber (FIC) was used as a fission fragment detector with a detection efficiency of no less than 97%. The high instantaneous flux and the low background characterizing the n_TOF facility resulted in wide-energy-range data (0.02 to 200 MeV), with high energy resolution, high statistics, and systematic uncertainties bellow 3%. Previous investigations around the energy of the fission threshold revealed structures attributed to β-vibrational levels, which have been confirmed by the present measurements. Theoretical calculations have been performed, employing the TALYS code with model parameters tuned to fairly reproduce the experimental data.

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Section: Discussionmentioning

confidence: 99%

“…The deduced values for each target are shown in Table II. The residual alpha-particle background was estimated from runs without the neutron beam and was found to be negligible [30].…”

Section: Discussionmentioning

confidence: 99%

Neutron-induced fission cross section ofU234measured at the CERN n_TOF facility

Karadimos¹,

Vlastou²,

Ioannidis³

et al. 2014

Phys. Rev. C

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“…The second collimator is located near the experimental area at a distance of 175 m and has an outer diameter of 40 cm and a variable inner diameter. For this capture experiment we used an inner diameter of 1.8 cm while for most fission experiments [36][37][38][39] a diameter of 8 cm has been used. The collimation resulted in a nearly symmetric Gaussian-shaped beam profile at the sample position of 185.2 m with a standard deviation of about 0.77 cm at low neutron energies.…”

Section: Methodsmentioning

confidence: 99%

Publisher's Note: Measurement of resolved resonances of232Th(n,γ) at the n_TOF facility at CERN [Phys. Rev. C85, 064601 (2012)]

Gunsing¹,

Berthoumieux²,

Aerts³

et al. 2012

Phys. Rev. C

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The yield of the neutron capture reaction 232 Th(n, γ ) has been measured at the neutron time-of-flight facility n_TOF at CERN in the energy range from 1 eV to 1 MeV. The reduction of the acquired data to the capture yield for resolved resonances from 1 eV to 4 keV is described and compared to a recent evaluated data set. The resonance parameters were used to assign an orbital momentum to each resonance. A missing level estimator was used to extract the s-wave level spacing of D 0 = 17.2 ± 0.9 eV.

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“…An interesting case was the measurement of the fission cross section of 236 U [122]. For this reaction, the n_TOF data unambiguously demonstrated that two major evalua-tions, namely JEFF-3.2 and ENDF/B-VII.0 were overestimating the cross section at low energy by more than two orders of magnitude and that several resonances present in the evaluations were not related to the neutron-induced fission of 236 U, but rather to an unrecognised 235 U contamination in the sample used in the previous measurements included in the evaluations.…”

Section: Fission Cross Sections Of Minor Actinidesmentioning

confidence: 99%

The fission experimental programme at the CERN n_TOF facility: status and perspectives

et al. 2020

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Neutron-induced fission reactions play a crucial role in a variety of fields of fundamental and applied nuclear science. In basic nuclear physics they provide important information on properties of nuclear matter, while in nuclear technology they are at the basis of present and future reactor designs. Finally, there is a renewed interest in fission reactions in nuclear astrophysics due to the multi-messenger observation of neutron star mergers and the important role played by fission recycling in r -process nucleosynthesis. Although studied for several decades, many fundamental questions still remain on fission reactions, while modern applications and the development of more reliable nuclear models require high-accuracy and consistent experimental data on fission cross sections and other fission observables. To address these needs, an extensive fission research proa gramme has been carried out at the n_TOF neutron timeof-flight facility at CERN during the last 18 years, taking advantage of the high energy resolution, high luminosity and wide energy range of the neutron beam, as well as of the detection and data acquisition systems designed for this purpose. While long-lived isotopes are studied on the 185 m long flight-path, the recent construction of a second experimental area at a distance of about 19 m has opened the way to challenging measurements of short-lived actinides. This article provides an overview of the n_TOF experimental programme on neutron-induced fission reactions along with the main characteristics of the facility, the various detection systems and data analysis techniques used. The most important results on several major and minor actinides obtained so far and the future perspectives of fission measurements at n_TOF are presented and discussed.

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Measurement of the236U(n,f) cross section from 170 meV to 2 MeV at the CERN

Cited by 16 publications

References 25 publications

Neutron-induced fission cross section ofU234measured at the CERN n_TOF facility

Neutron-induced fission cross section ofU234measured at the CERN n_TOF facility

Publisher's Note: Measurement of resolved resonances of232Th(n,γ) at the n_TOF facility at CERN [Phys. Rev. C85, 064601 (2012)]

The fission experimental programme at the CERN n_TOF facility: status and perspectives

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