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http://dx.doi.org/10.5516/NET.08.2012.003

EXPERIMENTAL ANALYSES OF SPALLATION NEUTRONS GENERATED BY 100 MEV PROTONS AT THE KYOTO UNIVERSITY CRITICAL ASSEMBLY  

Pyeon, Cheol Ho (Nuclear Engineering Science Division, Research Reactor Institute, Kyoto University)
Azuma, Tetsushi (Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University)
Takemoto, Yuki (Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University)
Yagi, Takahiro (Nuclear Engineering Science Division, Research Reactor Institute, Kyoto University)
Misawa, Tsuyoshi (Nuclear Engineering Science Division, Research Reactor Institute, Kyoto University)
Publication Information
Nuclear Engineering and Technology / v.45, no.1, 2013 , pp. 81-88 More about this Journal
Abstract
Neutron spectrum analyses of spallation neutrons are conducted in the accelerator-driven system (ADS) facility at the Kyoto University Critical Assembly (KUCA). High-energy protons (100 MeV) obtained from the fixed field alternating gradient accelerator are injected onto a tungsten target, whereby the spallation neutrons are generated. For neutronic characteristics of spallation neutrons, the reaction rates and the continuous energy distribution of spallation neutrons are measured by the foil activation method and by an organic liquid scintillator, respectively. Numerical calculations are executed by MCNPX with JENDL/HE-2007 and ENDF/B-VI libraries to evaluate the reaction rates of activation foils (bismuth and indium) set at the target and the continuous energy distribution of spallation neutrons set in front of the target. For the reaction rates by the foil activation method, the C/E values between the experiments and the calculations are found around a relative difference of 10%, except for some reactions. For continuous energy distribution by the organic liquid scintillator, the spallation neutrons are observed up to 45 MeV. From these results, the neutron spectrum information on the spallation neutrons generated at the target are attained successfully in injecting 100 MeV protons onto the tungsten target.
Keywords
ADS; KUCA; Spallation Neutrons; High-energy Protons; Reaction rates; Continuous Energy Distribution;
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