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論文

Evaluation of gamma-ray strength function based on measured gamma-ray pulse-height spectra in time-of-flight neutron capture experiments

岩本 信之; 中村 詔司; 木村 敦; 片渕 竜也*; Rovira, G.*; 原 かおる*; 岩本 修

EPJ Web of Conferences, 239, p.17016_1 - 17016_4, 2020/09

 被引用回数:0 パーセンタイル:0.19

Gamma-ray strength function (GSF) as well as nuclear level density is important ingredients to calculate neutron capture cross sections, since it gives energy-dependent transition strength of gamma-rays from a capture state and directly relates to spectrum of emitted gamma-rays. Therefore, the improvement of GSF is essential to enhance the reliability of neutron capture cross sections. The shape of GSF has been determined by experiments of neutron capture reactions, (p,p') reactions and nuclear resonance fluorescence. In addition, the use of the information of gamma-ray spectrum (i.e., pulse-height (PH) spectrum) measured by time-of-flight experiments is effective to evaluate the GSF. A lot of PH spectra have been measured by the Ge and NaI(Tl) detectors of the ANNRI installed at the Material and Life Science Experimental Facility in J-PARC. However, those spectra have not been actively used to extract the information of GSF so far. In the present study, we measured the PH spectrum of gold by using the NaI(Tl) detectors in ANNRI and used it for the evaluation of GSF. The gamma-ray spectrum for gold was calculated by a nuclear reaction model code CCONE. The obtained gamma-ray spectrum was applied to the Monte Carlo particle transport simulation code PHITS to derive PH spectrum comparable with the measured data. After this evaluation, we obtained GSF, reasonably explained the measured PH spectrum.

論文

Fast neutron capture reaction data measurement of minor actinides for development of nuclear transmutation systems

片渕 竜也*; 岩本 修; 堀 順一*; 木村 敦; 岩本 信之; 中村 詔司; 芝原 雄司*; 寺田 和司*; Rovira, G.*; 松浦 翔太*

EPJ Web of Conferences, 239, p.01044_1 - 01044_4, 2020/09

 被引用回数:1 パーセンタイル:89.98

In 2017, a research project entitled "Study on accuracy improvement of fast-neutron capture reaction data of long-lived MAs for development of nuclear transmutation systems" started as a joint collaboration, including Tokyo Tech, Japan Atomic Energy Agency and Kyoto University. This project focuses on neutron capture reaction of MAs, especially $$^{237}$$Np, $$^{241}$$Am and $$^{243}$$Am, in the fast neutron energy region. The final goal of this project is to improve the neutron capture cross sections of $$^{237}$$Np, $$^{241}$$Am and $$^{243}$$Am employing a high-intensity neutron beam from a spallation source of the Japan Proton Accelerator Research Complex (J-PARC) that reduces uncertainties of measurement. In this contribution, the overview of the project and the current progress will be presented.

論文

Neutron capture cross-section measurement and resolved resonance analysis of $$^{237}$$Np

Rovira, G.*; 片渕 竜也*; 登坂 健一*; 松浦 翔太*; 寺田 和司*; 岩本 修; 木村 敦; 中村 詔司; 岩本 信之; 瀬川 麻里子; et al.

Journal of Nuclear Science and Technology, 57(1), p.24 - 39, 2020/01

 被引用回数:4 パーセンタイル:84.6(Nuclear Science & Technology)

The neutron capture cross-section of $$^{237}$$Np has been measured in the neutron energy region of 10 meV to 500 eV. A neutron time-of-flight method was employed using the NaI(Tl) spectrometer in the ANNRI beam-line at the Japanese Proton Accelerator Re-search Complex (J-PARC). The experimental capture yield was derived using the pulse-height weighting technique and an energy dependent cross-section was obtained relative to the incident neutron spectrum derived from a $$^{10}$$B(n, $$alpha$$)$$^{7}$$Li reaction yield. The absolute cross-section was determined by normalizing the results to JENDL-4.0 cross-section data at the first resonance of $$^{237}$$Np. The thermal cross-section was measured to be 177.6 $$pm$$ 3.8 b. The resolved resonance region was analyzed with the REFIT code.

口頭

核変換システム開発のための長寿命MA核種の高速中性子捕獲反応データの精度向上に関する研究,2; J-PARC ANNRIでの中性子フィルタ装置開発と捕獲反応断面積測定

木村 敦; 中村 詔司; 岩本 信之; 岩本 修; 片渕 竜也*; 寺田 和司*; Rovira, G.*; 堀 順一*; 芝原 雄司*

no journal, , 

「核変換システム開発のための長寿命MA核種の高速中性子捕獲反応データの精度向上に関する研究」において、J-PARC ANNRIでの高速中性子エネルギー領域における捕獲反応断面積測定を進めている。ANNRIでの測定はJ-PARCの大強度中性子ビームが利用可能なため、統計精度が改善し、中性子捕獲断面積の高精度化が可能となる。しかしながら、中性子ビームがダブルパルスの構造を持つため中性子エネルギー分解能が悪いという問題があった。この問題を解決するため、中性子ビームを準単色化する中性子フィルタ装置の開発を行った。本発表では、開発した中性子フィルタ装置と断面積の測定計画について報告を行う。

口頭

核変換システム開発のための長寿命MA核種の高速中性子捕獲反応データの精度向上に関する研究,1; プロジェクトの全体計画

片渕 竜也*; 岩本 修; 堀 順一*; 岩本 信之; 木村 敦; 中村 詔司; 芝原 雄司*; 寺田 和司*; 高宮 幸一*; 福谷 哲*; et al.

no journal, , 

核変換システムを開発する上で長寿命MA核種の高速領域における高精度中性子捕獲断面積データが必要とされている。2017年より、東京工業大学, 原子力機構, 京都大学の共同プロジェクトとして、長寿命MAの高速中性子捕獲反応データの高精度化研究が始まった。今回、本プロジェクトの内容をシリーズ発表として報告する。本発表は、シリーズ発表の始めとしてプロジェクトの背景、狙い、全体計画について説明する。

口頭

High-energy measurement of the neutron capture cross-section of $$^{237}$$Np

Rovira, G.*; 片渕 竜也*; 登坂 健一*; 松浦 翔太*; 岩本 修; 木村 敦; 中村 詔司; 岩本 信之; 寺田 和司*

no journal, , 

The neutron capture cross section of $$^{237}$$Np was measured at the ANNRI beamline of J-PARC. A final value for the capture cross section of $$^{237}$$Np is presented using two normalization techniques. The capture data was normalized at the first resonance using JENDL-4.0 and also using the total neutron flux obtained from a $$^{197}$$Au sample measurement in which the first resonance was completely saturated. This measurement results were complemented with calculations using CCONE code to estimate the PH spectrum under the detection threshold. Alongside these results, an analysis of the high-energy capture cross-section with CCONE was performed. An evaluated cross-section is presented using the experimental results.

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