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Measurement of thick target neutron yield at 180$$^{circ}$$ for a mercury target induced by 3-GeV protons

松田 洋樹; 岩元 大樹; 明午 伸一郎; 竹下 隼人*; 前川 藤夫

Nuclear Instruments and Methods in Physics Research B, 483, p.33 - 40, 2020/11



Unified description of the fission probability for highly excited nuclei

岩元 大樹; 明午 伸一郎

Journal of Nuclear Science and Technology, 56(2), p.160 - 171, 2019/02

 被引用回数:0 パーセンタイル:100(Nuclear Science & Technology)

放射線挙動解析コードPHITSは、加速器駆動核変換システムや核破砕中性子源施設等における放射能・被曝線量評価及び施設の遮蔽設計に重要な役割を演じるが、PHITSの核破砕反応を記述するモデルINCL4.6/GEMは核分裂生成物の収量を大幅に過小評価することが知られており、モデルの高度化が求められている。本研究では、核分裂生成物の収量予測に重要なパラメータとなる「核分裂確率」を現象論的に記述するモデルを提案し、このモデルを粒子輸送計算コードPHITSに組み込まれている脱励起過程計算コードGEMの高エネルギー核分裂モデルに適用した。実験値との比較の結果、広範囲 のサブアクチノイド核種に対する陽子入射,中性子入射及び重陽子入射反応に対して、核分裂断面積を統一的に予測でき、その予測精度は従来モデルよりも大幅に改善することを示した。さらに、本モデルを用いた解析により、核分裂生成物の同位体分布を精度よく求めるためには、核内カスケード過程計算コードINCL4.6における高励起残留核の記述の修正が必要であることを明らかにした。


Validation of PHITS spallation models from the perspective of the shielding design of transmutation experimental facility

岩元 大樹; 明午 伸一郎

EPJ Web of Conferences, 153, p.01016_1 - 01016_9, 2017/09

 被引用回数:1 パーセンタイル:25.96

The impact of different spallation models implemented in the particle transport code PHITS on the shielding design of Transmutation Experimental Facility (TEF) was investigated. For 400-MeV proton incident on a lead-bismuth eutectic target. An effective dose rate at the end of a thick radiation shield (3-m-thick iron and 3-m-thick concrete) calculated by the Li${`e}$ge intranuclear cascade (INC) model version 4.6 (INCL4.6) coupled with the GEM code (INCL4.6/GEM) yields $$sim$$1.5 times higher than the Bertini INC model (Bertini/GEM). A comparison with experimental data for 500-MeV proton incident on a thick lead target shows that the INCL4.6/GEM is in fairly good agreement with the experiment, which suggest that the prediction accuracy of INCL4.6/GEM would be better than that of Bertini/GEM. In contrast, it is found that the dose rates in beam ducts in front of targets calculated by the INCL4.6/GEM are lower than those by the Bertini/GEM. Since both models underestimate the experimental results for neutron-production double-differential cross sections at 180$$^{circ}$$ for 140-MeV proton incident on carbon, iron, and gold targets, we conclude that it is necessary to allow for a margin of uncertainty caused by the spallation models, which is a factor of two, in estimating the dose rate induced by neutron streaming through a beam duct.


Impact of PHITS spallation models on the neutronics design of an accelerator-driven system

岩元 大樹; 西原 健司; 岩元 洋介; 橋本 慎太郎; 松田 規宏; 佐藤 達彦; 原田 正英; 前川 藤夫

Journal of Nuclear Science and Technology, 53(10), p.1585 - 1594, 2016/10

 被引用回数:10 パーセンタイル:15.59(Nuclear Science & Technology)

The impact of different spallation models and parametrisations of nucleon-nucleus interactions in PHITS on nuclear characteristics of an accelerator-driven system (ADS) is investigated. Cut-off neutrons below 20 MeV calculated by a current default option of the spallation model (i.e., Li${`e}$ge Intranuclear Cascade (INC) model version 4.6, INCL4.6) are found to be 14% less than those by the old spallation model (it i.e. Bertini INC model). This decrease increases the proton beam current that drives the 800-MW thermal power, and impacts various ADS parameters, including material damage, nuclear heating of the proton beam window (PBW), and the inventory of spallation products. To validate these options based on the ADS neutronics design, we conduct benchmark calculations of the total and nonelastic cross sections, thick target neutron yields, and activation reaction rate distributions. The results suggest that Pearlstein-Niita systematics, which is a default option of the nucleon-nucleus interaction parametrisation, would be best option and that the Bertini INC is better suited for cut-off neutrons than INCL4.6. However, because of the difficulty in making a definite conclusion on the spallation models, we conclude that relatively large uncertainty in the cut-off neutrons, which is the difference between the two spallation models (i.e. 14%), should be considered.



麻生 智一; 神永 雅紀; 日野 竜太郎

可視化情報学会誌, 22(Suppl.1), p.127 - 130, 2002/07



Water flow experiments and analyses on the cross-flow type mercury target model with the flow guide plates

羽賀 勝洋; 寺田 敦彦*; 神永 雅紀; 日野 竜太郎

Nuclear Engineering and Design, 210(1-3), p.157 - 168, 2001/12

 被引用回数:3 パーセンタイル:71.43(Nuclear Science & Technology)


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