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) reaction at 12, 20, and 30 MeVPatwary, M. K. A*; 金 政浩*; 青木 勝海*; 吉浪 皓亮*; 山口 真矢*; 渡辺 幸信*; 塚田 和明; 佐藤 望*; 浅井 雅人; 佐藤 哲也; et al.
Journal of Nuclear Science and Technology, 58(2), p.252 - 258, 2021/02
被引用回数：0 パーセンタイル：0.01(Nuclear Science & Technology)重陽子加速器中性子源の設計のため、これまでにLi, Be, Cといった軽元素に対する重陽子核データが数MeVから50MeVの入射エネルギー範囲で系統的に測定されてきた。しかし、二重微分中性子収量(DDTTNY)の実測データについては、特に入射エネルギー18から33MeVの範囲で不足しているのが現状である。この問題を解消するため、本研究では12, 20, 30MeVにおける天然炭素標的に対する()反応からのDDTTNYを多重箔放射化法によって測定した。DDTTNYを導出するためのアンフォールディングにはGRAVELコードを用いた。また、本測定結果を用いて重陽子入射反応計算コードDEURACSの検証を行うとともに、総中性子収量や0
放出における微分中性子収量に関する系統式の検証も行った。
藤 暢輔; 前田 亮; 瀬川 麻里子; Patwary, K.; 木村 敦; 中村 詔司; 遠藤 駿典; 海老原 充*
no journal, ,
中性子ビームを用いた非破壊元素分析法として、即発ガンマ線分析(PGA)と中性子共鳴捕獲分析(NRCA)がある。J-PARCの物質・生命科学実験施設のBL04に設置されている中性子核反応測定装置(ANNRI)では、大強度パルス中性子を用いることで、PGAとNRCAを同時に測定する事ができるほか、更にこの2つの分析手法を組み合わせた分析(TOF-PGA)も同時に行うことができる。TOF-PGAは、ガンマ線のエネルギーと中性子のエネルギー(共鳴のエネルギー)を同時に用いることができるため、優れた峻別性能を持つ。そのため、試料内に共存する元素からの影響を受けにくいことから、複雑な組成を持つ試料の分析において威力を発揮する。本発表では、ANNRIにおいて難測定核種として知られているTc-99およびPd-107の測定結果のほか、高精度化を目指した試料密度に対する補正に関する成果などについて報告する。
C at incident energies up to 30 MeV for nuclear non-proliferation applicationsPatwary, K.; 金 政浩*
no journal, ,
The intense neutron sources are promising in many aspects of nuclear non-proliferation applications. (d,xn) reactions on C are one of the prominent methods to produce the intensive neutrons because of their incident deuteron energy adjustment feature getting the most probable energy of the generated neutrons. However, the experimental data on (d,xn) reactions are insufficient and also the systematic measurements of neutron yields have not been conducted. Thus, at the tandem accelerator facility of the Japan Atomic Energy Agency, we conducted a systematic measurement of neutron yields for deuteron on C (
20mm
4mm
and density 2.2 g/cm
) at beam energies of 12, 20, and 30 MeV using the multiple-foil activation method to address the lack of nuclear data. The neutrons were detected at emission angles of 0, 10, 20, 30, and 45 and irradiated (irradiation time 
5h) a stack of Ni, In, 
Al, 
Co, and 
Nb samples at each emission angles, respectively. After analysis of gamma-ray spectra of the stacked samples obtained by a HPGe detector, the GRAVEL unfolding techniques were applied to derive the neutron yields. The results were compared with (a) the theoretical estimation by DEURACS, and (b) the available published data which confirmed the systematics of the differential yields at 0 and total neutron yield per incident deuteron up to 30 MeV of deuteron energy. This talk will present and discuss the results of neutron yield measurements in detail.
IrPatwary, K.; 瀬川 麻里子; 前田 亮; 遠藤 駿典; 木村 敦; 中村 詔司; 藤 暢輔
no journal, ,
The neutron capture cross-section for Ir plays an important role to improve the accuracy of the 
-process model, in particular, at branching point where the neutron capture reaction competes with the 
decay in the -process. It is however difficult to explain the late stage of stellar evolution due to lack of data and large discrepancies among the neutron capture cross-section data for Ir in past measurements. For this reason, we measured neutron capture cross-section for Ir in a neutron energy range from 0.01 eV to 1 keV by applying the TOF method with the ANNRI beamline of MLF at the J-PARC. The NaI(Tl) detectors equipped at the ANNRI beamline were used for capture yield measurements. The thermal-neutron capture cross-section of Ir was preliminarily determined to be 857.47
38.28 b. When compared with past measurements, the present result agreed with the value by Huang et al. The resonances of Ir below 160 eV were examined for the obtained Ir(n, 
) cross-sections using the resonance analysis code, REFIT, and the present results were compared with parameters both in past measurements and in JENDL-5. Results showed that the magnitudes of several resonances differed from those in the JENDL-5 data due to the change in the neutron resonance width. I will present detailed results and discuss their impact on astrophysics at the conference presentation.
