High-accuracy determination of the neutron flux at n_TOF

Author(s)

M. Barbagallo, C. Guerrero, A. Tsinganis, D. Tarrio, S. Altstadt, S. Andriamonje, J. Andrzejewski, L. Audouin, V. Becares, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Cortes, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, K. Goebel, M. B. Gomez-Hornillos, I. F. Goncalves, E. Gonzalez-Romero, E. Griesmayer, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkins, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimos, N. Kivel, P. Koehler, M. Kokkoris, M. Krticka, J. Kroll, C. Lampoudis, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Manousos, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaers, T. Papaevangelou, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Steinegger, G. Tagliente, J. L. Tain, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudis, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Weiss, T. Wright, P. Zugec

Abstract

The neutron flux of the n_TOF facility at CERN was measured, after

installation of the new spallation target, with four different systems

based on three neutron-converting reactions, which represent accepted

cross sections standards in different energy regions. A careful

comparison and combination of the different measurements allowed us to

reach an unprecedented accuracy on the energy dependence of the neutron

flux in the very wide range (thermal to 1 GeV) that characterizes the

n_TOF neutron beam. This is a pre-requisite for the high accuracy of

cross section measurements at n_TOF. An unexpected anomaly in the

neutron-induced fission cross section of ²³⁵U

is observed in the energy region between 10 and 30keV, hinting at a

possible overestimation of this important cross section, well above

currently assigned uncertainties.

Organisation(s)

Isotope Physics

External organisation(s)

Istituto Nazionale di Fisica Nucleare (INFN), Roma, National Technical University of Athens (NTUA), Universidade de Santiago de Compostela (USC), Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Lodz, Institut de Physique Nucléaire d'Orsay (IPN), Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, French Alternative Energies and Atomic Energy Commission (CEA), University of Manchester, University of Zagreb, Universitat Politècnica de Catalunya, Universidade Técnica de Lisboa, Universidad de Sevilla, Instituto de Física Corpuscular (IFIC), Paul Scherrer Institute, Aristotle University of Thessaloniki, Bhabha Atomic Research Center, Technische Universität Wien, University of York, Karlsruher Institut für Technologie, University of Bologna, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Commiss European Communities, Joint Res Ctr, Inst Reference Mat & Measurements, Universität Basel, Oak Ridge National Laboratory , European Organization for Nuclear Research (CERN), Italian National Agency for New Technologies, Energy and Sustainable Economic Development

Journal

European Physical Journal A

Volume

49

No. of pages

11

ISSN

1434-6001

DOI

https://doi.org/10.1140/epja/i2013-13156-x

Publication date

12-2013

Peer reviewed

Yes

Austrian Fields of Science 2012

103005 Atomic physics, 103004 Astrophysics

Keywords

Portal url

https://ucrisportal.univie.ac.at/en/publications/9e0fb6de-af8e-4c4e-bbc0-beec6995a8ef