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Status and outlook of the neutron time-of-flight facility n_TOF at CERN

AuthorsGunsing, F.; Abbondanno, U.; Aerts, G.; Álvarez, H.; Álvarez-Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Badurek, G.; Baumann, P.; Pavlik, A.; Rudolf, G.; Pavlopoulos, P.; Perrot, L.; Rullhusen, P.; Pigni, M. T.; Plag, R.; Plompen, A.; n_TOF Collaboration; Poch, A.; Tavora, L.; Pretel, C.; Quesada, J.; Reifarth, R.; Rosetti, M.; Rubbia, C.; Salgado, J.; Sarchiapone, L.; Vincente, M. C.; Savvidis, I.; Stephan, C.; Becvar, F.; Tagliente, G.; Walter, S.; Taín, José Luis ; Tassan-Got, L.; Terlizzi, R.; Vannini, G.; Berthoumieux, E.; Vaz, P.; Ventura, A.; Villamarin, D.; Vlachoudis, V.; Vlastou, R.; Cortés Rossell, Guillem; Voss, F.; Wendler, H.; Wiescher, M.; Wisshak, K.; Calvino, F.; Cano Ott, Daniel; Dolfini, R.; Capote, R.; Albornoz, A. C. de; Cennini, P.; Couture, A.; Eleftheriadis, C.; Chepel, V.; Chiaveri, E.; Colonna, N.; Cox, J.; Ferrant, L.; Dahlfors, M.; David, S.; Dillmann, I.; Domingo Pardo, César ; Dridi, W.; Durán, I.; Haight, R.; Ferrari, A.; Ferreira-Marques, R.; Frais-Koelbl, H.; Fujii, K.; Furman, W.; Jericha, E.; Goncalves, I.; González-Romero, E.; Goverdovski, A.; Karamanis, D.; Heil, M.; Gramegna, F.; Griesmayer, E.; Guerrero, C.; Haas, B.; Kerveno, M.; Herrera-Martínez, A.; Igashira, M.; Isaev, S.; Kappeler, F.; Kadi, Y.; Karadimos, D.; Ketlerov, V.; Marrone, S.; Koehler, P.; Konovalov, V.; Kossionides, E.; Krticka, M.; Mengoni, A.; Lampoudis, C.; Leeb, H.; Lindote, A.; Neves, F.; Lopes, I.; Oberhummer, H.; Lozano, M.; Lukic, S.; Marganiec, J.; Marques, L.; Martínez Pérez, Trinitario; Massimi, C.; Mastinu, P.; Milazzo, P. M.; Moreau, C.; Mosconi, M.; O'Brien, S.; Oshima, M.; Plukis, A.; Pancin, J.; Papachristodoulou, C.; Papadopoulos, C.; Rauscher, T.; Paradela, C.; Patronis, N.
Issue Date25-May-2007
CitationNuclear Instruments & Methods in Physics Research Section B - Beam Interactions With Materials and Atoms 261(1-2): 925-929 (2007)
AbstractThe neutron time-of-flight facility n_TOF at CERN, fully operational since 2002, combines a high instantaneous neutron flux with high energy resolution. The wide energy range and the high neutron flux per time-of-flight burst result in a much enhanced signal to background ratio for neutron capture of radioactive isotopes and makes this facility well suited for the measurement of high quality neutron-induced reaction cross-sections.
Neutrons are created by spallation reactions induced by a pulsed 20 GeV/c proton beam impinging on a lead target. A 5 cm water slab surrounding the lead target serves as a coolant and at the same time as a moderator of the spallation neutron spectrum, providing a wide energy spectrum from 0.1 eV to about 250 MeV.
By the end of 2005, a first phase of data taking has been successfully terminated. Fission and capture experiments have been performed on a variety of isotopes of interest for nuclear astrophysics, advanced nuclear technologies and for basic nuclear physics.
The instrumentation developed for this facility consists of parallel plate avalanche counter and fission ionization chamber detectors for the fission experiments and of low mass C6D6 detectors and a 4 pi BaF2 total absorption calorimeter for capture experiments. A new data acquisition system, based on sampling of the detector signals, has been developed to cope with the high count rates and to minimize the effective dead time to only a few tens of nanosecond.
A second phase of data taking is planned to start in 2007, after an upgrade of the spallation target. On the longer term, the construction of a flight path at 20 in resulting in an increased neutron flux of about a factor of 100 opens new possibilities.
Description5 pages, 2 figures.-- PACS nrs.: 29.25; 28.20.−v; 24.30.−v; 98.80.-- ISI Article Identifier: 000248784100221
Printed version published Aug 2007.-- Issue title: The Application of Accelerators in Research and Industry - Proceedings of the Nineteenth International Conference on The Application of Accelerators in Research and Industry (Fort Worth, TX, Aug 20-25, 2006).
Publisher version (URL)http://dx.doi.org/10.1016/j.nimb.2007.03.096
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