Analysis of reaction rate distributions on a thick tungsten target bombarded with protons of 0.8 to 1.2 GeV Takada, H; Meigo, S; Sasa, T; Fukahori, T [Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan)]; Belyakov-Bodin, V I; Krupny, G I; Titarenko, Y E [Institute of Theoretical and Experimental Physics, Moscow (Russian Federation)] 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ACCELERATOR DRIVEN TRANSMUTATION; ACCURACY; CROSS SECTIONS; N CODES; SPALLATION; TUNGSTEN; VALIDATION In order to estimate the accuracy of the NMTC/JAERI-MCNP-4A code system, an analytical study is performed for the distributions of reaction rates of various activation samples on the surface of a cylindrical thick tungsten target bombarded with 0.8 and 1.2 GeV protons. It is found through the comparison between the experiment and calculation that the NMTC/JAERI-MCNP-4A code system can represent the reaction rates of the activation detectors which are sensitive to the sub-10 MeV neutrons with an accuracy of 10 to 15%. As the threshold energy of the activation detector increases, however, the agreement becomes worse. The calculated results are 50 to 75% in the C/E ratios for the activation detectors sensitive to the neutrons with tens of MeV. The disagreement suggests that the NMTC/IAERI estimates too low the production of neutrons with energies of several tens of MeV in the thick target. (authors) OECD Nuclear Energy Agency, 92 - Issy-les-Moulineaux (France) Available from INIS in electronic form France 1997-07-01 English Conference Conference: Meeting on actinide and fission product partitioning and transmutation, Mito City (Japan), 11-13 Sep 1996; Other Information: 32 refs; Related Information: In: Actinide and fission product partitioning and transmutation, 424 pages. Medium: X; Size: page(s) 323-333 https://doi.org/ [] INIS-FR-08-0240 TRN: FR0702518038892 FRN 2008-05-29 21016660