https://doi.org/10.1051/epjconf/20100807009
Measurements of high-energy neutron-induced fission ofnatPb and 209Bi
1 Universidade de Santiago de Compostela, Spain
2 Centre National de la Recherche Scientifique/IN2P3-IPN, Orsay, France
3 Istituto Nazionale di Fisica Nucleare, Trieste, Italy
4 CEA/Saclay – IRFU, Gif-sur-Yvette, France
5 Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid, Spain
6 CEA/Saclay – DSM/DAPNIA, Gif-sur-Yvette, France
7 University of Lodz, Lodz, Poland
8 University of Ioannina, Greece
9 Atominstitut der Österreichischen Universitäten, Technische Universität
10 Centre National de Recherche Scientifique/IN2P3 – IreS, Strasbourg, France
11 Charles University, Prague, Czech Republic
12 Universidad Politecnica de Catalunya, Barcelona, Spain
13 Istituto Nazional di Fisica Nucleare, Laboratori Nazionali di Legnaro, Italy
14 Dipartimento di Fisica, Università di Padova, Italy
15 International Atomic Energy Agency (IAEA), Nuclear Data Section, Vienna, Austria
16 Universidad de Sevilla, Spain
17 Instituto Tecnológico e Nuclear (ITN), Lisbon, Portugal
18 CERN, Geneva, Switzerland
19 LIP – Coimbra, Departamento de Fisica da Universidade de Coimbra, Portugal
20 Istituto Nazionale di Fisica Nucleare, Bari, Italy
21 University of Notre Dame, Notre Dame, USA
22 Karlsruhe Institute of Technology (KIT), Campus Nord, GmbH (FZK) Institut für Kernphysik, Germany
23 Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Spain
24 GSI, Darmstadt, Germany
25 Aristotle University of Thessaloniki, Greece
26 Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, Dubna, Russia
27 Centre National de la Recherche Scientifique/IN2P3-CENBG, Bordeaux, France
28 Los Alamos National Laboratory, New Mexico, USA
29 Tokyo Institute of Technology, Tokyo, Japan
30 Oak Ridge National Laboratory, Physics Division, Oak Ridge, USA
31 NCSR, Athens, Greece
32 Dipartamento di Fisica, Università de Bologna, and Sezione INFN di Bologna, Italy
33 Japan Atomic Energy Research Institute, Tokai-mura, Japan
34 National Technical University of Athens, Greece
35 Fakültat für Physik, Universität Wien, Austria
36 Pôle Universitaire Léonard de Vinci, Paris, La Défense, France
37 CEC-JRC-IRMM, Geel, Belgium
38 Departament of Physics – University of Basel, Switzerland
a e-mail: diego.tarrio@usc.es
The CERN Neutron Time-Of-Flight (n_TOF) facility is well suited to measure low cross sections as those of neutron-induced fission in subactinides. The cross section ratios of natPb and 209Bi relative to 235U and 238U were measured using PPAC detectors and a fragment coincidence method that allows us to identify the fission events. The present experiment provides first results for neutron-induced fission up to 1 GeV. Good agreement is found with previous experimental data below 200 MeV. The comparison with proton-induced fission indicates that the limiting regime where neutron-induced and proton-induced fission reach equal cross sections is close to 1 GeV.
The n TOF Collaboration, www.cern.ch/ntof
© Owned by the authors, published by EDP Sciences, 2010