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Iwamoto, Hiroki; Nakano, Keita; Meigo, Shinichiro; Satoh, Daiki; Iwamoto, Yosuke; Sugihara, Kenta; Nishio, Katsuhisa; Ishi, Yoshihiro*; Uesugi, Tomonori*; Kuriyama, Yasutoshi*; et al.
Journal of Nuclear Science and Technology, 60(4), p.435 - 449, 2023/04
Times Cited Count：3 Percentile：68.71(Nuclear Science & Technology)Double-differential thick target neutron yields (TTNYs) for Fe, Pb, and Bi targets induced by 107-MeV protons were measured using the fixed-field alternating gradient accelerator at Kyoto University for research and development of accelerator-driven systems (ADSs) and fundamental ADS reactor physics research at the Kyoto University Critical Assembly (KUCA). Note that TTNYs were obtained with the time-of-flight method using a neutron detector system comprising eight neutron detectors; each detector has a small NE213 liquid organic scintillator and photomultiplier tube. The TTNYs obtained were compared with calculation results using Monte Carlo-based spallation models (i.e., INCL4.6/GEM, Bertini/GEM, JQMD/GEM, and JQMD/SMM/GEM) and the evaluated high-energy nuclear data library, i.e., JENDL-4.0/HE, implemented in the particle and heavy iontransport code system (PHITS). All models, including JENDL-4.0/HE, failed to predict high-energy peaks at a detector angle of 5
. Comparing the energy- and angle-integrated spallation neutron yields at energies of 
20 MeV estimated using the measured TTNYs and the PHITS indicated that INCL4.6/GEM would be suitable for the Monte Carlo transport simulation of ADS reactor physics experiments at the KUCA.
Iwamoto, Hiroki
JAEA-Conf 2021-001, p.24 - 29, 2022/03
Various spallation reaction models have been developed for the use of neutronic and shielding design of high-energy accelerator facilities such as J-PARC and ADS. However, their complicated theory for the de-excitation process has made improving their prediction accuracy difficult. In particular, it has been pointed out that the conventional models underestimate the yield of the spallation products produced from the fission reaction. This work has thus aimed to model the probability was described using a simpler, systematic expression, and then confirmed to predict fission cross sections for various incident energies and target nuclei with improved accuracy [1]. In this presentation, we will present the description of our model and research results. [1] H. Iwamoto and S. Meigo, "Unified description of the fission probability for highly excited nuclei", Journal of Nuclear Science and Technology, 56:2, 160-171 (2019).
Takeshita, Hayato*; Meigo, Shinichiro; Matsuda, Hiroki*; Iwamoto, Hiroki; Nakano, Keita; Watanabe, Yukinobu*; Maekawa, Fujio
Nuclear Instruments and Methods in Physics Research B, 511, p.30 - 41, 2022/01
Times Cited Count：5 Percentile：65.59(Instruments & Instrumentation)Nuclide production cross sections for proton-induced reactions on Mn and Co at incident energies of 1.3, 2.2, and 3.0 GeV were measured by the activation method at the J-PARC. In total, 143 production cross sections of reaction products were obtained. Among them, the cross sections of 
Mn(p,X)
S and Mn(p,X)
Ar were measured for the first time. The stable proton beam and well established beam monitoring system contributed to the reduction of the systematic uncertainties to typically less than 5%, which was better than those of the previous data. To examine the prediction capabilities of spallation reaction models and evaluated data library, the measured data were compared with the spallation reaction models in PHITS (INCL4.6/GEM, etc.), INCL++/ABLA07, and the JENDL/HE-2007 library. The comparison of the mean square deviation factors indicated that both INCL4.6/GEM and JENDL/HE-2007 showed better agreement with the measured data than the others.
Iwamoto, Hiroki; Meigo, Shinichiro
JPS Conference Proceedings (Internet), 33, p.011046_1 - 011046_6, 2021/03
no abstracts in English
Iwamoto, Hiroki
Kaku Deta Nyusu (Internet), (128), p.13 - 25, 2021/02
no abstracts in English
Iwamoto, Hiroki; Meigo, Shinichiro; Matsuda, Hiroki
EPJ Web of Conferences, 239, p.06001_1 - 06001_6, 2020/09
Times Cited Count：1 Percentile：72.93(Nuclear Science & Technology)no abstracts in English
ZrKawase, Shoichiro
Kaku Deta Nyusu (Internet), (122), p.75 - 80, 2019/02
Zirconium-93 is one of major long-lived fission products contained in high-level radioactive waste. This report introduces an experimental study of proton-and deuteron-induced spallation reactions on Zr at 105 MeV per nucleon in inverse kinematics carried out at RIKEN RI Beam Factory. The isotopic production cross sections for a wide range of isotopes including stable ones were obtained. The experimental results were compared to the PHITS calculations considering both the intra-nuclear cascade and evaporation processes.
Nakayama, Shinsuke; Furutachi, Naoya; Iwamoto, Osamu; Watanabe, Yukinobu*
Physical Review C, 98(4), p.044606_1 - 044606_8, 2018/10
Times Cited Count：14 Percentile：75.94(Physics, Nuclear)Use of deuteron-induced spallation reactions at intermediate energies has recently been proposed for transmutation of several long-lived fission products (LLFPs). In the design study of a transmutation system using a deuteron primary beam, accurate cross section data of deuteron-induced reactions on the LLFPs are indispensable. In the present study, production cross sections of residual nuclei in the deuteron-induced reactions on Zr and 
Pd at 
MeV/nucleon are analyzed using DEURACS, in which the breakup processes are explicitly taken into account. The calculated values reproduced the experimental data quantitatively well. From a component-by-component analysis, it was found that the components of nucleon absorption make the significant contributions to residual nuclei production. This result strongly indicates that consideration of the breakup processes is essentially important to predict production of residual nuclei in deuteron-induced reactions.
Oigawa, Hiroyuki; Maekawa, Fujio; Meigo, Shinichiro; Kasugai, Yoshimi; Tsujimoto, Kazufumi; Nishihara, Kenji; Sasa, Toshinobu; Konno, Chikara; Kai, Tetsuya; Ikeda, Yujiro
JAERI-Tech 2002-037, 220 Pages, 2002/03
JAERI-Tech-2002-037.pdf:11.09MB
no abstracts in English
Sasa, Toshinobu; Tsujimoto, Kazufumi; Takizuka, Takakazu; Takano, Hideki
Nuclear Instruments and Methods in Physics Research A, 463(3), p.495 - 504, 2001/05
Times Cited Count：15 Percentile：71.2(Instruments & Instrumentation)no abstracts in English
Oigawa, Hiroyuki; Ikeda, Yujiro; Sasa, Toshinobu; Meigo, Shinichiro; Takano, Hideki; Tsujimoto, Kazufumi; Nishihara, Kenji
JAERI-Tech 2000-062, 64 Pages, 2000/09
JAERI-Tech-2000-062.pdf:4.25MB
no abstracts in English
Mukaiyama, Takehiko
Genshiryoku Shisutemu Nyusu, 11(1), p.5 - 13, 2000/06
no abstracts in English
Mukaiyama, Takehiko
Dai-38-kai Genshiryoku Sogo Shimpojium Rombunshu, p.1 - 9, 2000/05
no abstracts in English
Mukaiyama, Takehiko
Genshikaku Kenkyu, 44(6), p.23 - 32, 2000/04
no abstracts in English
Haga, Katsuhiro; *; Bauer, G.*; Guttek, B.*
JAERI-Tech 99-018, 41 Pages, 1999/03
no abstracts in English
Sasa, Toshinobu; Tsujimoto, Kazufumi; Takizuka, Takakazu; Takano, Hideki
JAERI-Data/Code 99-007, 65 Pages, 1999/03
JAERI-Data-Code-99-007.pdf:2.12MB
no abstracts in English
Aso, Tomokazu; Ishikura, Shuichi*; Terada, Atsuhiko; Kai, Tetsuya; Teshigawara, Makoto*; Kaminaga, Masanori; Hino, Ryutaro; Watanabe, Noboru*
Proc. of 14th Meeting of the Int. Collaboration on Advanced Neutron Sources (ICANS-14), 2, p.804 - 822, 1998/00
no abstracts in English
Mukaiyama, Takehiko; Takano, Hideki; Oyama, Yukio; Mizumoto, Motoharu; Hino, Ryutaro; Ikeda, Yujiro
Proceedings of OECD/NEA Workshop on Utilization and Reliability of High Power Proton Accelerators, p.77 - 86, 1998/00
no abstracts in English
Endo, Akira; Takada, Hiroshi; Yamaguchi, Yasuhiro
JAERI-Data/Code 97-039, 37 Pages, 1997/10
JAERI-Data-Code-97-039.pdf:1.36MB
no abstracts in English
;
PNC TN9410 97-029, 39 Pages, 1997/03
At present, a high power CW(Continuous Wave) electron linac accelerator is under development in PNC as a part of transmutation study by accelerators. Last year we performed nuclear and thermal calculation on a hybrid reactor system combining the electron linac and a subcritical core with TRU fuel as one of applied uses. It is well known that the hybrid reactor system can also use a proton accelerator instead of the electron one. The nuclear and thermal calculation was performed on the system using the proton accelerator in this year. Comparison of the extinguished quantity of TRU fuel was performed between calculation results of both systems. In the proton linac hybrid system, a proton beam accelerated from the linac is injected into a target located in the center of the subcritical core to produce neutrons by spallation reactions. The neutrons enter the surrounding subcritical core to extinguish the TRU. The result of calculation showed that the extinguished quantity of TRU was about 10 kg where the proton beam power of 100 MW injected into the subcritical core system of keff = 0.95 over 1 year. The extinguished quantity of TRU was about 100 times as large as that in the case studied last year on the electron linac hybrid system.
