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New neutron long-counter for delayed neutron investigations with the LOHENGRIN fission fragment separator
Mathieu L., Serot O., Materna T., Bail A., K¨ Oster U. et al
Journal of Instrumentation 7 (2012) P08029 - http://hal.in2p3.fr/in2p3-00749652
Physique/Physique Nucléaire Expérimentale
New neutron long-counter for delayed neutron investigations with the LOHENGRIN fission fragment separator
L. Mathieu1, 2, O. Serot2, T. Materna3, A. Bail2, U. K¨ Oster3, H. Faust3, O. Litaize2, E. Dupont2, C. Jouanne2, A. Letourneau4, S. Panebianco4
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
http://www.cenbg.in2p3.fr/
CNRS : UMR5797 – IN2P3 – Université Sciences et Technologies - Bordeaux I
Chemin du Solarium - BP 120 - 33175 Gradignan Cedex
France
2 :  CEA-DEN - CEA-Direction de l'Energie Nucléaire
CEA
France
3 :  ILL - Institut Laue-Langevin
http://www.ill.fr/
ILL
6, rue Jules Horowitz BP 156 38042 Grenoble Cedex 9
France
4 :  DAM/DIF - DAM Île-de-France
http://www-dam.cea.fr/
CEA : DAM/DIF
CEA Bruyères-le-Châtel 91297 Arpajon cedex
France
ACEN
Some neutrons are emitted from fission products seconds to minutes after fission occurs. The knowledge of these delayed neutrons is essential in the field of nuclear energy. But the probabilities to emit such delayed neutrons (Pn) are not always well known. A summary of different databases and compilations of Pn values is presented to show these discrepancies and uncertainties. The usual methods used to determine these nuclear data are then reviewed with an emphasis on biases and systematic errors to be avoided. To measure precise Pn values, a new neutron LOng-counter with ENergy Independant Efficiency (LOENIE) has been built for the LOHENGRIN separator facility installed at Institut Laue Langevin (FRANCE). Its characteristics and first results obtained are presented.

Articles dans des revues avec comité de lecture
2012
Journal of Instrumentation
Publisher Institute of Physics: Hybrid Open Access
ISSN 1748-0221 
7
P08029

Neutron detectors (cold – thermal – fast neutrons) – Detector modelling and simulations I (interaction of radiation with matter – interaction of photons with matter – interaction of hadrons with matter – etc)