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Nagaya, Yasunobu
Annals of Nuclear Energy, 82, p.226 - 229, 2015/08
Times Cited Count：4 Percentile：33.25(Nuclear Science & Technology)The methods to calculate the kinetics parameters of 
and 
with the differential operator sampling have been reviewed. The comparison of the results obtained with the differential operator sampling and iterated fission probability approaches has been performed. It is shown that the differential operator sampling approach gives the same results as the iterated fission probability approach within the statistical uncertainty. In addition, the prediction accuracy of the evaluated nuclear data library JENDL-4.0 for the measured 
values is also examined. It is shown that JENDL-4.0 gives a good prediction except for the uranium-233 systems. The present results imply the need for revisiting the uranium-233 nuclear data evaluation but detailed sensitivity analysis is required for further discussion.
Nagaya, Yasunobu; Okumura, Keisuke; Mori, Takamasa
Annals of Nuclear Energy, 82, p.85 - 89, 2015/08
Times Cited Count：14 Percentile：73.22(Nuclear Science & Technology)This paper describes the recent development status of a Monte Carlo code MVP developed at Japan Atomic Energy Agency. The basic features and capabilities of MVP are overviewed. In addition, new capabilities useful for reactor analysis are also described.
Sato, Tatsuhiko; Niita, Koji*; Matsuda, Norihiro; Hashimoto, Shintaro; Iwamoto, Yosuke; Furuta, Takuya; Noda, Shusaku; Ogawa, Tatsuhiko; Iwase, Hiroshi*; Nakashima, Hiroshi; et al.
Annals of Nuclear Energy, 82, p.110 - 115, 2015/08
Times Cited Count：34 Percentile：93.49(Nuclear Science & Technology)The general purpose Monte Carlo Particle and Heavy Ion Transport code System, PHITS, is being developed through a collaboration of several institutes in Japan and Europe. The Japan Atomic Energy Agency is responsible for managing the entire project. PHITS can deal with the transport of nearly all particles, including neutrons, protons, heavy ions, photons, and electrons, over wide energy ranges using various nuclear reaction models and data libraries. This paper briefly summarizes the physics models implemented in PHITS, and introduces some important functions useful for particular purposes, such as an event generator mode and beam transport functions.
Ogawa, Tatsuhiko; Sato, Tatsuhiko; Hashimoto, Shintaro; Niita, Koji*
Proceedings of Joint International Conference on Supercomputing in Nuclear Applications + Monte Carlo (SNA & MC 2013) (CD-ROM), 6 Pages, 2014/06
Times Cited Count：0 Percentile：0.04(Computer Science, Interdisciplinary Applications)The fragmentation cross-sections of relativistic energy nucleus-nucleus and proton-nucleus collisions were analyzed using the Statistical Multi-fragmentation Model (SMM) incorporated with the Particle and Heavy Ion Transport code System (PHITS). The fragmentation cross-sections simulated by PHITS-SMM and PHITS were compared with the literature data. For heavy-ion-induced reactions, the simulation by PHITS-SMM predicted fragmentation cross-sections up to two orders of magnitude more accurate than PHITS. For proton-induced reactions, noticeable improvements were observed for both heavy and medium-mass target. Therefore, implementation of a multi-fragmentation model is a robust way to accurately predict fragmentation cross-sections at intermediate energies.
-ray productionOgawa, Tatsuhiko; Hashimoto, Shintaro; Sato, Tatsuhiko; Niita, Koji*
Proceedings of Joint International Conference on Supercomputing in Nuclear Applications + Monte Carlo (SNA & MC 2013) (CD-ROM), 6 Pages, 2014/06
A new de-excitation model, EBITEM (ENSDF-Based Isomeric Transition/ isomEr production Model), intended for simulation of isomeric transition of excited nuclei was incorporated to PHITS and applied for de-excitation of nuclear reaction products. The energy spectra of the prompt -rays and isomer production in various reactions were simulated by PHITS-EBITEM and compared with literature data. The isomeric to ground ratios and prompt -ray spectra from neutron capture reaction products agreed with literature data generally within a few 10%. PHITS-EBITEM was also applied to spallation reaction products and isomeric to ground ratios were reproduced within a factor of three. PHITS-EBITEM is useful for accurate simulation of detector performance, radiation shielding and radioactive inventory including isomers.
Misawa, Takeharu; Takase, Kazuyuki; Yoshida, Hiroyuki; Ose, Yasuo*; Oka, Yoshiaki*
Proceedings of Joint International Conference on Supercomputing in Nuclear Applications + Monte Carlo (SNA & MC 2013) (CD-ROM), 2 Pages, 2013/10
Homma, Yuto*; Moriwaki, Hiroyuki*; Oki, Shigeo; Ikeda, Kazumi*
no journal, ,
no abstracts in English
