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Calviani, M.; Praena, J.; Abbondanno, U.; Aerts, G.; Álvarez, H.; Álvarez‐Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Badurek, G.; Baumann, P.; Bečvář, F.; Belloni, F.; Berthier, B.; Berthoumieux, E.; Calviño, F.; Cano‐Ott, D.; Capote, R.; Carrapiço, C.; Cennini, P.; Chepel, V.; Chiaveri, E.; Colonna, N.; Cortés, G.; Couture, A.; Cox, James W.; Dahlfors, M.; David, S.; Dillmann, I.; Domingo‐Pardo, C.; Dridi, W.; Durán, I.; Eleftheriadis, C.; Embid‐Segura, M.; Ferrant, L.; Ferrari, A.; Ferreira‐Marques, R.; Fujii, K.; Furman, W.; Gonçalves, I. F.; González‐Romero, E.; Goverdovski, A.; Gramegna, F.; Guerrero, C.; Gunsing, F.; Haas, Brian J.; Haight, R. C.; Heil, M.; Herrera-Martı́nez, A.; Igashira, M.; 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.; Lopes, I.; Lozano, M.; Lukić, S.; Marganiec, J.; Marrone, S.; Martínez, T.; Massimi, C.; Mastinu, P.; Mengoni, A.; Milazzo, Paolo; Moreau, C.; Mosconi, M.; Neves, F.; Oberhummer, H.; O’Brien, S.; 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. M.; Rauscher, T.; Reifarth, R.; Rosetti, M.; 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.; Vincente, M. C.; Vlachoudis, V.; Vlastou, R.; Voß, F.; Walter, S.; Wiescher, M.; Wisshak, K.

doi:10.1103/physrevc.80.044604

Cited by 31 publications

(11 citation statements)

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“…The FIC detector has been used for fission cross section measurements at n_TOF since the beginning of its operation, providing interesting results for several isotopes, such as 233 U [120,121] [127]. More details on these measurements and results are presented in Sect.…”

Section: The Fast Ionisation Chamber (Fic)mentioning

confidence: 99%

“…One of the first results obtained at n_TOF regarded the neutron-induced fission cross section of 233 U, the key reaction of the Th/U fuel cycle. Data on this reaction were collected with the Fast Ionisation Chamber up to 20 MeV [120,121], complemented with the PPAC setup all the way up to 1 GeV [195,196]. High-accuracy results, characterised by systematic uncertainties slightly above 3%, were obtained for the first time on this reaction in a wide energy range.…”

Section: Fission Cross Sections Of Minor Actinidesmentioning

confidence: 99%

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

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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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Section: The Fast Ionisation Chamber (Fic)mentioning

confidence: 99%

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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“…Cortés-Giraldo 13) , M. Diakaki 14) , I. Dillmann 15) , C. Domingo-Pardo 16) , I. Duran 17) , N. Dzysiuk 18) , C. Eleftheriadis 19) , M. Fernández-Ordóñez 7) , A. Ferrari 1) , K. Fraval 9) , S. Ganesan 20) , G. Giubrone 21) , M.B. Gómez-Hornillos 11) , I.F.…”

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“…Leong 4) , R. Losito 1) , M. Lozano 13) , A. Manousos 19) , J. Marganiec 3) , T. Martinez 7) , C. Massimi 26) , P.F. Mastinu 18) , M. Mastromarco 6) , M. Meaze 6) , E. Mendoza 7) , A. Mengoni 27) , P.M. Milazzo 28) , M. Mirea 5) , C. Paradela 17) , A. Pavlik 25) , J. Perkowski 3) , J. Praena 13) , J.M. Quesada 13) , T. Rauscher 29) , R. Reifarth 16) , A. Riego 11) , F. Roman 1,5) , C. Rubbia 1,30) , R. Sarmento 12) , G. Tagliente 6) , J.L.…”

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“…Quesada 13) , T. Rauscher 29) , R. Reifarth 16) , A. Riego 11) , F. Roman 1,5) , C. Rubbia 1,30) , R. Sarmento 12) , G. Tagliente 6) , J.L. Tain 21) , D. Tarrìo 17) , L. Tassan-Got 4) , A. Tsinganis 1) , S. Valenta 8) , G. Vannini 26) , V. Variale 6) , P. Vaz 12) , A. Ventura 27) , M.J. Vermeulen 22) , R. Versaci 1) , R. Vlastou 14) , A. Wallner 25) , T. Ware 10) , T.J. The neutron time-of-flight facility n_TOF at CERN, Switzerland, operational since 2001, delivers neutrons using the Proton Synchrotron (PS) 20 GeV/c proton beam impinging on a lead spallation target.…”

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Present status and future programs of the n_TOF experiment

Chiaveri

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Vlachoudis

et al. 2012

EPJ Web of Conferences

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Neutron Cross Section Measurements

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Gunsing

et al. 2010

Handbook of Nuclear Engineering

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The main emphasis during the past year has been on analyzing and publishing results and the preparation for the impending start-up of the newly modified Nevis cyclotron. Papers on the separated isotopes of Yb and W have been submitted to the Physical Review. The published results on Er confirm Dyson's theory of level spacing systematics. The total cross section, resonance parameters and spin-parity values of Na below 300 keV have been submitted for publication. A report on the evaluation of the T's of U 238 has been distributed. We now have extensive results on the Er isotopes, 232 U, 152 > 15lt Sm, 151 , 153 Eu, Fe, La, In, Ta, F, Mg, Al, S, CI, K and Ca. A paper on the precision measurement of the 2200 m/sec neutron-proton capture cross section has been submitted for publication. The background for fission measurements has been extensively analyzed and modifications to the neutron source of the Nevis cyclotron will be made for the next run. New methods of analyzing low count rate data have been developed to eliminate observation of spurious levels. The captive cross sections of thulium and rhodium have been analyzed and the results reported. During the report period, our main emphasis has been on analyzing and publishing data, and the preparation for the impending startup of the newly modified Nevis cyclotron. A number of major papers and reports on our results have been published or submitted for publication. Papers on the neutron resonance spectroscopy and systematics of the separated Yb isotopes and the separated W isotopes have been submitted to the Physical Review. These papers round out our recent work on many of the rare earth isotopes, 150<_ A< 190, with a paper on the separated even Gd isotopes in preparation and tne separated Dy isotopes expected to be ready soon. The published paper on the Er isotopes, confirming Dyson's theories concerning level spacings systematics, has led to extensive Monte-Carlo theoretical studies by our group, partly on the basis of interactions with Professor Freeman Dyson. These studies have extended the understanding of the implications of the statistical orthogonal ensemble theory and have permitted a detailed comparison with our results for many even-even nuclei, 150 < A< 190, which supports this theory well for the first time. "The total cross section, resonance parameters and spin-parity values for Na below 300 keV has been submitted to Nuclear Science and Engineering for publication. An evaluation report on the total radiation widths of the important reactor material 238 U has concluded that there is no convincing evidence for quasi-periodic structure in r versus energy (apart from a statistical level to level fluctuation of a high chi-squared number of degrees of freedom). The fluctuations in r present in many data sets are most likely due to experimental uncertainties in the r values themselves. Our best evaluated average radiation width was taken to be = 23.55 + 0.16 meV. T We now have.extensive results for the resonance parameters and systematics for a large ...

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High-accuracyU233(n,f)cross-section measurement at the white-neutron source n_TOF from near-thermal to
M. Calviani¹,
J. Praena²,
U. Abbondanno³
et al.

Cited by 31 publications

References 23 publications

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

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

Present status and future programs of the n_TOF experiment

Neutron Cross Section Measurements

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High-accuracyU233(n,f)cross-section measurement at the white-neutron source n_TOF from near-thermal toM. Calviani1, J. Praena2, U. Abbondanno3 et al.

Cited by 31 publications

References 23 publications

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

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

Present status and future programs of the n_TOF experiment

Neutron Cross Section Measurements

Contact Info

Product

Resources

About

High-accuracyU233(n,f)cross-section measurement at the white-neutron source n_TOF from near-thermal to
M. Calviani¹,
J. Praena²,
U. Abbondanno³
et al.