International Conference on Nuclear Data for Science and Technology 2010
J. Korean Phys. Soc. 59, 1624-1627
Paper ID: ND-1681
DOI: 10.3938/jkps.59.1624
PACS: 28.20.-v, 29.27.-a
Characterization of the New n_TOF Neutron Beam: Fluence, Profile and Resolution
C. Guerrero1, M. Calviani2, E. Berthoumieux3, S. Andriamonje2, J. Andrzejewski4, L. Audouin5, V. Avrigeanu6, V. Becares1, F. Becvar7, F. Belloni8, B. Berthier5, M. Brugger2, F. Calvino9, D. Cano-Ott1, C. Carrapico10, F. Cerutti2, E. Chiaveri2, N. Colonna11, G. Cortes9, I. Dillmann12, C. Domingo-Pardo13, I. Duran14, M. Fernandez-Ordonez1, A. Ferrari2, S. Ganesan15, G. Giubrone16, M. B. Gomez-Hornillos9, I. F. Goncalves10, E. Gonzalez-Romero1, F. Gramegna17, F. Gunsing3, S. Harrisopulos18, M. Heil13, K. Ioannides19, E. Jericha20, F. Käppeler21, Y. Kadi2, D. Karadimos19, M. Krticka7, E. Lebbos2, C. Lederer22, H. Leeb20, M. Lozano23, J. Marganiec4, S. Marrone11, F. Martin-Fuertes1, T. Martinez1, P. F. Mastinu17, C. Massimi24, E. Mendoza1, A. Mengoni25, P. M. Milazzo8, M. Mirea6, M. Moinul11, M. Mosconi26, R. Nolte26, C. Paradela14, A. Pavlik22, J. Perkowski4, G. Pina1, J. Praena23, J. M. Quesada23, J. Quinones1, R. Sarmento10, G. Tagliente11, J. L. Tain16, L. Tassan-Got5, D. Tarrio14, G. Vannini24, V. Variale11, P. Vaz10, A. Ventura25, V. Vlachoudis1, R. Vlastou27, A. Wallner22 and C. Weiss20
1 Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid, 28040, Spain
2 CERN, Geneva, Switzerland
3 CEA/Saclay - Irfu/SPhN, Gif-sur-Yvette, France
4 University of Lodz, Lodz, Poland
5 Centre National de la Recherche Scienti_que/IN2P3-IPN, Orsay, France
6 Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN HH, Bucharest-Magurele, Romania
7 Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
8 Istituto Nazionale di Fisica Nucleare, Trieste, Italy
9 Universitat Politecnica de Catalunya, Barcelona, Spain
10 Instituto Tecnologico e Nuclear (ITN), Lisbon, Portugal
11 Istituto Nazionale di Fisica Nucleare, Bari, Italy
12 Physik Department E12, Technische Universität München, and Excellence Cluster Universe, Garching, Germany
13 GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt, Germany
14 Universidade de Santiago de Compostela, Spain
15 BARC, Mumbai, India
16 Instituto de Fisica Corpuscular, CSIC-Universidad de Valencia, Spain
17 Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Italy
18 NCSR, Demokritos, Greece
19 University of Ioannina, Greece
20 Atominstitut der Österreichischen Universitäten,Technische Universität Wien, Austria
21 Karlsruhe Institute of Technology, Campus Nord,, Institut für Kernphysik, 76021 Karlsruhe, Germany
22 VERA Laboratory, Faculty of Physics, University of Vienna, Vienna 1090, Austria
23 Universidad de Sevilla, Spain
24 Dipartimento di Fisica, Universit_a di Bologna, and Sezione INFN di Bologna, Italy
25 ENEA, Bologna, Italy
26 Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
27 National Technical University of Athens, Greece
Abstract
After a halt of four years, the n_TOF spallation neutron facility at CERN has resumed operation in November 2008 with a new spallation target characterized by an improved safety and engineering design, resulting in a more robust overall performance and efficient cooling.

The first measurement during the 2009 run has aimed at the full characterization of the neutron beam. Several detectors, such as calibrated fission chambers, the n_TOF Silicon Monitor, a MicroMegas detector with 10B and 235U samples, as well as liquid and solid scintillators have been used in order to characterize the properties of the neutron fluence. The spatial profile of the beam has been studied with a specially designed "X-Y" MicroMegas which provided a 2D image of the beam as a function of neutron energy. Both properties have been compared with simulations performed with the FLUKA code. The characterization of the resolution function is based on results from simulations which have been verified by the study of narrow capture resonances of 56Fe, which were measured as part of a new campaign of (n,γ) measurements on Fe and Ni isotopes.

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