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論文

Neutron total and capture cross-section measurement and resolved resonance analysis of Er

Rovira Leveroni, G.; 木村 敦; 中村 詔司; 遠藤 駿典; 岩本 修; 岩本 信之; 片渕 竜也*

Annals of Nuclear Energy, 225, p.111688_1 - 111688_18, 2026/01

https://doi.org/10.1016/j.anucene.2025.111688

The neutron total and capture cross sections of $$^{nat}$$Er were measured at the Accurate Neutron-Nucleus Reaction Measurement Instrument beamline in the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. For the neutron total cross-section measurements, Li-glass detectors were employed to derive the neutron transmission ratio of three $$^{nat}$$Er transmission samples with thicknesses of 1 mm, 0.175 mm and 0.05 mm. The neutron capture cross-section was determined from measurements of 0.025-mm-thick $$^{nat}$$Er samples with NaI(Tl) and Ge spectrometers in separate experiments, since they offer complementary capabilities. Moreover, the capture cross-section of $$^{167}$$Er was derived below 1 eV, since it accounted for over 95% of the capture events in $$^{nat}$$Er. Finally, the resolved resonance region up to 65 eV was analyzed using the REFIT code. The resonance parameters of 20 $$^{167}$$Er resonances, together with one resonance for each $$^{164}$$Er and $$^{166}$$Er were determined in a least-square fit using a combination of both capture data and the transmission data from the thicker 1 mm and 0.175 mm samples. T

論文

Photoneutron emission process on nuclei around A = 200 for giant dipole resonance energies based on neutron energy and angular distribution

Nguyen, T. H. T.; 佐波 俊哉*; 山崎 寛仁*; 岩本 信之; 糸賀 俊朗*; 桐原 陽一; Lee, E.*; 杉原 健太*; 宮本 修治*; 橋本 智*; et al.

Physics Letters B, 870, p.139900_1 - 139900_8, 2025/11

https://doi.org/10.1016/j.physletb.2025.139900

This study has concentrated on the angular distribution of photoneutron emission on $$^{181}$$Ta, $$^{nat}$$W, $$^{197}$$Au, $$^{nat}$$Pb, and $$^{209}$$Bi for a 12.6 MeV linearly polarized photon beam. The angular distribution was obtained from the double differential cross-sections (DDXs), measured at the NewSUBARU-BL01 facility, and can be expressed as a function of azimuthal angle. The DDXs were divided into two distinct components based on the angular coefficient ratio: the low-energy component up to 3 MeV and the high-energy above 3 MeV. The angular distribution of the low-energy component was isotropic, whereas the high-energy component was distributed anisotropically and depended on the nuclear structure of target nuclei. The anisotropy is apparent on the spherical nuclei, but minor on the deformed ones. The comparison of angular coefficient ratios for 12.6 MeV and 16.6 MeV photon energies in the previous studies emphasized the correlation between photoneutron emission and nuclear structure.

論文

Potassium abundances in extremely metal poor stars; Implications for nucleosynthesis in the final stages of massive star evolution

石垣 美歩*; 冨永 望*; 青木 和光*; 和南城 伸也*; 滝脇 知也*; 中村 航*; 岩本 信之; 野本 憲一*; 小林 千晶*

Astrophysical Journal, 992(2), p.215_1 - 215_17, 2025/10

https://doi.org/10.3847/1538-4357/ae00b8

We present the abundance analysis of Potassium (K) in extremely metal-poor stars based on high-resolution spectra obtained by High-Dispersion Spectrograph on Subaru Telescope. One-dimensional LTE abundances of K as well as other elemental abundances including Na, Mg, Ca, Ti, Cr, and Ni are obtained by a spectral synthesis method. We detect K lines in seven stars with [Fe/H] $$<-3.0$$. We find that [K/Fe] and [K/Ca] ratios of seven stars are enhanced relative to the solar value with scatter smaller than the typical uncertainty. While a significant variation in [Na/Mg] ratios can be seen, the observed small scatter in [K/Fe] and [K/Ca] is in line with a hypothesis that the K in those stars has been produced in the innermost ejecta of core-collapse supernovae whose yields are independent of progenitor masses or metallicities.

論文

JENDL photonuclear data file 2016 revision 1

岩本 信之

Journal of Nuclear Science and Technology, 13 Pages, 2025/10

https://doi.org/10.1080/00223131.2025.2573658

Photonuclear reactions are used in many application fields. The continuous improvements are requisite to provide reliable data. The photonuclear data file JENDL/PD-2016 was released in 2017 to cover many nuclides. After the release, the upper energy of 140 MeV in JENDL/PD-2016 was extended to 200 MeV for nuclides evaluated with CCONE. New evaluations were made for structural nuclides, minor actinides, unstable nuclides with half-life of 10 minutes or longer surrounded stable nuclides, and nuclides measured at NewSUBARU facility. In addition, the nuclear data of isomer targets for $$^{242,244}$$Am and $$^{254}$$Es were evaluated. JENDL photonuclear data file 2016 revision 1 (JENDL/PD-2016.1) was released, including the above improvements. The revisions of nuclear data from JENDL/PD-2016 are made for 1096 nuclides from Si to Fm. The total number of nuclides is 2684, including four isomer targets.

論文

Study of the spin-memory effect with low-energy gamma-rays in $$^{177}$$Hf(n,$$gamma$$)$$^{178}$$Hf reaction measurement

河村 しほり*; 遠藤 駿典; 岩本 修; 岩本 信之; 木村 敦; 北口 雅暁*; 中村 詔司; 奥平 琢也*; Rovira Leveroni, G.; 清水 裕彦*; et al.

EPJ Web of Conferences, 329, p.05002_1 - 05002_3, 2025/06

https://doi.org/10.1051/epjconf/202532905002

共鳴の全角運動量は低エネルギー核反応において重要なパラメータの一つである。実験から共鳴のJを推定する方法はいくつか提案されているが、本研究ではWetzelとThomasによって提案された、共鳴のガンマ線スペクトルにおいて、適切に選ばれた2つの低エネルギーガンマ線の強度比を比較する方法に着目した。この方法は、HuizengaとVandenboschによって提案されたスピンメモリー効果(SME)に基づいている。SMEとは、カスケード遷移において多くの中間励起準位が存在しても、初期の共鳴状態のスピン情報が残ることを意味する。強度比に現れるSMEの強さは、強度比の差から定量的に評価することができる。過去の測定結果から、原子番号Zがマジックナンバー(Z=50)付近でSMEが大きくなることが示唆されている。本研究ではZ=50から離れた元素である天然のHf(Z=72)を用いて、J-PARC・MLF・ANNRIにおいて中性子捕獲反応測定を行った。SMEの強さは、共鳴からの低エネルギー$$gamma$$線の強度比から決定された。その結果、Hf(Z=72)で観測されたSMEはTa(Z=73)よりも非常に大きいことがわかった。

論文

Circular polarization measurement of $$gamma$$-rays emitted from $$^{32}$$S(n,$$gamma$$)$$^{33}$$S reaction with polarized neutrons

遠藤 駿典; 藤岡 宏之*; 井出 郁央*; 飯沼 昌隆*; 岩本 信之; 岩本 修; 亀田 健斗*; 河村 しほり*; 木村 敦; 北口 雅暁*; et al.

EPJ Web of Conferences, 329, p.05003_1 - 05003_3, 2025/06

https://doi.org/10.1051/epjconf/202532905003

共鳴の全角運動量は核データにおいて重要なパラメータの一つであるが、その測定は困難な場合が多く、測定で決定されていないことが多い。本研究では共鳴の全角運動量を偏極中性子照射により発生したガンマ線の円偏光度の測定により決定する手法の確立を目指している。円偏光どの測定を行うためのガンマ線ポラリメータを開発し、J-PARC・MLF・ANNRIに設置し、偏極中性子入射による$$^{32}$$S(n,$$gamma$$)$$^{33}$$S反応における5.4MeVガンマ線の円偏光度の測定を行った。この5.4MeVのガンマ線は50%円偏光していることが知られており、このガンマ線を用いてポラリメータの円偏光度への感度であるAnalyzing Powerを決定することが目的である。測定の結果1%程度の差が確認され、ANNRIにて初めて円偏光度の測定に成功した。

論文

Photonuclear reaction cross-section evaluation of $$^{181}$$Ta and $$^{209}$$Bi considering experimental double differential cross-section data

Nguyen, T. T. H.*; 岩本 信之; 佐波 俊哉*

EPJ Web of Conferences, 322, p.10004_1 - 10004_3, 2025/03

https://doi.org/10.1051/epjconf/202532210004
 被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)

The double differential cross-sections (DDXs) on the medium and heavy targets have been measured using monoenergetic, polarized 13 and 17 MeV photon beams. Therefore, it is desired that the DDX data be included in the evaluation process of the nuclear data library. We have been implementing this evaluation on $$^{181}$$Ta and $$^{209}$$Bi. These nuclei are relatively heavy, but different in nuclear structure and shape. The evaluation was performed to increase the photoneutron emission from the preequilibrium process described by the two-component exciton model, using the CCONE code. For this purpose, modifications of the multiplying factor for the state density in the exciton model were made in comparison with the DDX data. Our evaluation for reaction cross-sections and DDXs was compared to the results from JENDL-5, as well as experimental data. The evaluation gives better reproduction of photoneutron emission than JENDL-5 for DDXs at 13 and 17 MeV photon energies while maintaining consistency on the total photoneutron cross-section data available.

論文

Accurate measurement of the $$^{129}$$I neutron capture cross-section in the keV neutron region

Rovira Leveroni, G.; 木村 敦; 中村 詔司; 遠藤 駿典; 岩本 修; 岩本 信之; 片渕 竜也*

Journal of Nuclear Science and Technology, 12 Pages, 2025/00

https://doi.org/10.1080/00223131.2025.2543579
 被引用回数：0 パーセンタイル：0.00

The $$^{129}$$I neutron capture cross-section was measured at the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) beamline in the Materials and Life Science (MLF) facility of the Japan Proton Accelerator Research Complex (J-PARC). To obtain accurate results in the keV neutron region, the recently developed neutron filtering technique was employed with a 20-cm-thick $$^{nat}$$Si filter to tailor the incident neutron flux into quasi-monoenergetic neutron peaks with averaged neutron energies of 51.5 and 127.7 keV and, at the same time, hugely increase the signal-to-noise ratio. The present cross-section results were determined form the capture yield ratio of $$^{129}$$I to that of $$^{197}$$Au and using the evaluated nuclear data from JENDL-5 as reference. The $$^{129}$$I neutron capture cross section was found to be 0.278 $$pm$$ 0.034 b at 51.5 keV and 0.141 $$pm$$ 0.015 b 127.7 keV, validating the JENDL-5 and JEFF-3.3 evaluations, as well as the results from Noguere et al., in contrast to the larger evaluations of JENDL-4.0 and ENDF/B-VIII.1 and the data from Macklin et al.

論文

Photonuclear data evaluation for nuclei around A=200 considering experimental double differential cross-section data

Nguyen, T. H. T.; 岩本 信之; 佐波 俊哉*

Journal of Nuclear Science and Technology, 17 Pages, 2025/00

https://doi.org/10.1080/00223131.2025.2519705
 被引用回数：0 パーセンタイル：76.46(Nuclear Science & Technology)

This study focuses on the evaluation of photonuclear data for nuclei around A=200 ($$^{181}$$Ta, $$^{nat}$$W, $$^{197}$$Au, $$^{nat}$$Pb, and $$^{209}$$Bi), incorporating experimental double differential cross-section (DDX) data at photon energies of 13 and 17 MeV. The evaluation is performed using the nuclear reaction model code CCONE, combining the Hauser-Feshbach statistical model and the preequilibrium two-component exciton model. We find that incorporating experimental DDX data for the evaluation process has an impact, in particular, for considering the contribution of the preequilibrium component. The reliability of the photonuclear data is improved in comparison with the evaluated photonuclear data of JENDL-5.

論文

Neutron total and capture cross section measurements of $$^{nat}$$Er at ANNRI

Rovira Leveroni, G.; 木村 敦; 中村 詔司; 遠藤 駿典; 岩本 修; 岩本 信之; 片渕 竜也*

JAEA-Conf 2024-002, p.127 - 132, 2024/11

https://doi.org/10.11484/jaea-conf-2024-002

Measurements to measure the total and neutron capture cross section of $$^{nat}$$Er were performed in the Accurate Neutron Nucleus Reaction Measurement Instrument (ANNRI) at the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). In this study, the preliminary results for the $$^{nat}$$Er neutron total and capture cross sections measured with Li-glass, Ge and NaI(Tl) detectors are presented and compared.

論文

Evaluation of photonuclear reaction cross-section data for $$^{209}$$Bi at 13 and 17 MeV photon energies

Nguyen, T. T. H.*; 岩本 信之; 佐波 俊哉*

JAEA-Conf 2024-002, p.139 - 143, 2024/11

https://doi.org/10.11484/jaea-conf-2024-002

Photonuclear data are essential for electron accelerator shielding design and possibly nuclear transmutation. So far, photonuclear cross-sections of various target materials have been evaluated up to a photon energy of 200 MeV within the nuclear data libraries, such as JENDL-5. Almost all data in JENDL-5 have been evaluated based on the experimental reaction cross-section data. Unfortunately, the photonuclear cross-section cannot provide all information about the emitted secondary particles, for instance, their energy distributions. Recently, the photoneutron energy spectra on the $$^{209}$$Bi target at 13 and 17 MeV photon energies have been measured. The 13 and 17 MeV photon beams are nearly monoenergetic and have high intensity. Given that $$^{209}$$Bi is one of the standard target materials, we re-evaluated the photonuclear data of this target according to ($$gamma,sn$$), ($$gamma,n$$), and ($$gamma,2n$$) reaction cross-section data by I. Gheorghe et al. The evaluation procedure was conducted on the CCONE code system. The photo-absorption cross-sections were evaluated with the giant dipole resonance (GDR) and quasi-deuteron (QD) models. The emission of photoneutrons is described by the exciton model for the preequilibrium process and the statistical model for the compound process. The photoneutron energy spectra have been compared to the experimental data to find the connection between the theoretical reaction models and experiment.

論文

第36回NEA核データ評価国際協力ワーキングパーティ(WPEC)会合報告

岩本 修; 岩本 信之; 多田 健一; 片渕 竜也*

核データニュース(インターネット), (139), p.1 - 7, 2024/10

OECD/NEA/NSCが主催するWPEC(Working Party on International Nuclear Data Evaluation Co-operation)の第36回会合、傘下の専門家グループ(EG)及びサブグループ(SG)会合が2024年5月13日から18日にNEA本部とオンラインのハイブリッド形式で開催された。日本からは岩本(修)が現地で参加し、岩本(信之)、多田、片渕がオンラインで参加した。核データの測定や評価及びEGやSGの活動報告、新SGの提案がなされた。これらの概要については報告する。

論文

Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons

遠藤 駿典; 安部 亮太*; 藤岡 宏之*; 猪野 隆*; 岩本 修; 岩本 信之; 河村 しほり*; 木村 敦; 北口 雅暁*; 小林 龍珠*; et al.

European Physical Journal A, 60(8), p.166_1 - 166_10, 2024/08

https://doi.org/10.1140/epja/s10050-024-01392-6
 被引用回数：3 パーセンタイル：70.29(Physics, Nuclear)

Measurements of $$gamma$$-ray circular polarization emitted from neutron capture reactions provide valuable information for nuclear physics studies. The spin and parity of excited states can be determined by measuring the circular polarization from polarized neutron capture reactions. Furthermore, the $$gamma$$-ray circular polarization in a neutron capture resonance is crucial for studying the enhancement effect of parity nonconservation in compound nuclei. The $$gamma$$-ray circular polarization can be measured using a polarimeter based on magnetic Compton scattering. A polarimeter was constructed, and its performance indicators were evaluated using a circularly polarized $$gamma$$-ray beam. Furthermore, as a demonstration, the $$gamma$$-ray circular polarization was measured in $$^{32}$$S(n,$$gamma$$)$$^{33}$$S reactions with polarized neutrons.

論文

Neutron capture cross section measurement of $$^{129}$$I and $$^{127}$$I using the NaI(Tl) spectrometer of the ANNRI beamline at J-PARC

Rovira Leveroni, G.; 木村 敦; 中村 詔司; 遠藤 駿典; 岩本 修; 岩本 信之; 藤 暢輔; 瀬川 麻里子; 前田 亮; 片渕 竜也*

European Physical Journal A, 60(5), p.120_1 - 120_14, 2024/05

https://doi.org/10.1140/epja/s10050-024-01333-3
 被引用回数：2 パーセンタイル：35.22(Physics, Nuclear)

The neutron capture cross section of $$^{129}$$I and $$^{127}$$I were measured from the thermal to the keV energy region with the NaI(Tl) spectrometer of the Accurate Neutron-Nucleus Reaction Measurement Instrument beamline in the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. The neutron capture yield was determined by means of the total energy detection principle with the pulse-height weighting technique. The present cross section results for $$^{127}$$I were normalized using the saturated resonance method with a thick-enough $$^{197}$$Au and provide good agreement with JENDL-5 from thermal to about 500 keV. A resonance analysis with the REFIT code was performed and the resonance parameters for $$^{127}$$I below 310 eV are presented in this work. In the case of $$^{129}$$I, the three largest resonances of $$^{127}$$I were employed for the cross section normalization. The present results for $$^{129}$$I are the first experimental data for the neutron region between thermal and 20 eV. The present data display a different energy dependence than that in the JENDL-5 and JEFF-3.3 and much similar to that in ENDF/B-VIII.0. Notwithstanding, good agreement was found at the thermal region between the present measurement of 31.6 $$pm$$ 1.3 b and both evaluated and most experimental data.

論文

$$^{241}$$Am neutron capture cross section measurement using the NaI(Tl) spectrometer of the ANNRI beamline of J-PARC

Rovira Leveroni, G.; 木村 敦; 中村 詔司; 遠藤 駿典; 岩本 修; 岩本 信之; 片渕 竜也*; 児玉 有*; 中野 秀仁*; 佐藤 八起*

Journal of Nuclear Science and Technology, 61(4), p.459 - 477, 2024/04

https://doi.org/10.1080/00223131.2023.2239885
 被引用回数：2 パーセンタイル：17.48(Nuclear Science & Technology)

The neutron capture cross-section of $$^{241}$$Am was measured from 10 meV to about 1 MeV using the NaI(Tl) spectrometer of the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) beamline in the Materials and Life Science (MLF) facility of the Japan Proton Accelerator Research Complex (J-PARC). The total energy detection principle was applied in conjunction with the pulse-height weighting technique to derive the neutron capture yield. The present cross-section results were normalized using a $$^{197}$$Au sample measurement by applying the saturated resonance method. The thermal cross section was measured to be 708 $$pm$$ 22 b, in agreement within uncertainties to the present evaluation in JENDL-5 of 709 b. Moreover, the results of a shape resonance analysis of the resolved resonance region are also provided in the present dissertation.

論文

Evaluation of the production amount of $$^{225}$$Ac and its uncertainty through the $$^{226}$$Ra(n,2n) reaction in the experimental fast reactor Joyo

佐々木 悠人*; 佐野 亜々留; 佐々木 新治; 岩本 信之; 大内 和希; 北辻 章浩; 高木 直行*; 前田 茂貴

Journal of Nuclear Science and Technology, 61(4), p.509 - 520, 2024/04

https://doi.org/10.1080/00223131.2023.2243941
 被引用回数：6 パーセンタイル：86.11(Nuclear Science & Technology)

$$^{225}$$Acは医薬品向け$$alpha$$放出核種として注目されており、今後需要が増えることが見込まれる。創薬分野の研究開発のみならず経済安全保障の観点でも国産化が急務である。「常陽」では、$$^{225}$$Ac製造の技術基盤を確立するため、「常陽」に隣接するPIE施設への照射装置の迅速な払出し技術の確立、$$^{226}$$Raの中性子照射による$$^{225}$$Ac製造量評価、$$^{226}$$Raから$$^{225}$$Acを効率的に回収するための分離プロセスを検討している。本発表では、「常陽」での照射からPIE施設への移送、化学処理の経過時間による減衰並びに核反応断面積及び解析の不確かさを考慮しても十分な$$^{225}$$Ac製造が可能なこと及びDGAレジンを吸着材として用いることにより、Ra及び照射により生成が予想される不純物を除去しAcを単離できる見通しについて報告する。また、医療側のニーズを踏まえた製造量についても報告する。

論文

Measurements of the neutron total and capture cross sections and derivation of the resonance parameters of $$^{181}$$Ta

遠藤 駿典; 木村 敦; 中村 詔司; 岩本 修; 岩本 信之; Rovira Leveroni, G.; 藤 暢輔; 瀬川 麻里子; 前田 亮

Nuclear Science and Engineering, 198(4), p.786 - 803, 2024/04

https://doi.org/10.1080/00295639.2023.2227826
 被引用回数：1 パーセンタイル：17.48(Nuclear Science & Technology)

The neutron transmission ratio and capture yield for $$^{181}$$Ta were measured in J-PARC MLF ANNRI to improve the accuracy of resonance parameters. The total cross section was determined from the transmission ratio in the energy range from 0.2 to 150 eV. The capture cross section was obtained from the capture yield using the pulse height weighting technique (PHWT) in the energy range from thermal to 150 eV. The obtained transmission ratio and capture cross-section were fitted by the resonance analysis code, REFIT, and the resonance parameters were determined below 150 eV. It was also discussed the correlations caused by fitting based on statistical uncertainty and correlations for systematic uncertainty based on sample thickness in the transmission measurements.

論文

Neutron capture cross section measurement of $$^{129}$$I and $$^{127}$$I using ANNRI at MLF/J-PARC

Rovira Leveroni, G.; 木村 敦; 中村 詔司; 遠藤 駿典; 岩本 修; 岩本 信之; 藤 暢輔; 瀬川 麻里子; 前田 亮; 片渕 竜也*

JAEA-Conf 2023-001, p.74 - 79, 2024/02

https://doi.org/10.11484/jaea-conf-2023-001

Measurements to measure the neutron capture cross section of $$^{129}$$I and $$^{127}$$I were performed in the Accurate Neutron Nucleus Reaction Measurement Instrument (ANNRI) at the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). The time-of-flight (TOF) methodology was employed to determine the neutron capture cross section from thermal to about 100 keV. The results from $$^{127}$$I were used to normalize the $$^{129}$$I cross section. Preliminary results of a resonance analysis below 100 eV for $$^{129}$$I are also presented.

論文

Status of the $$^{226}$$Ra nuclear data library and its impact on the production amount of $$^{225}$$Ac via the $$^{226}$$Ra (n,2n) reaction

佐々木 悠人; 岩本 信之; 高木 直行*; 前田 茂貴

Journal of Nuclear Science and Technology, 61(2), p.251 - 260, 2024/02

https://doi.org/10.1080/00223131.2023.2295018
 被引用回数：1 パーセンタイル：33.61(Nuclear Science & Technology)

$$^{225}$$Acは、標的アルファ療法の有望なアルファ放出核種である。しかし、現在の$$^{225}$$Ac供給能力は世界で約63GBq/yであり、これは主にいくつかの研究所に貯蔵されている$$^{225}$$Acジェネレータである$$^{229}$$Thの保有量に依存している。このため、代替の$$^{225}$$Ac製造方法が強く望まれている。加速器と原子炉を使用して$$^{226}$$Raと$$^{232}$$Thをターゲットとする$$^{225}$$Acとその親核種の製造方法の研究開発は、世界中で活発に進められている。著者らは、高速実験炉「常陽」の利活用として、高速中性子スペクトルを用いた$$^{226}$$Ra(n,2n)$$^{225}$$Ra法に着目した。本研究では、$$^{225}$$Ac生成のターゲットである$$^{226}$$Raの核データライブラリを調査し、さまざまな核データライブラリで$$^{225}$$Acの製造量を評価し、その違い、影響を評価した。共分散データを含む核反応断面積はTENDL-2021、JEFF-3.3、およびEAF-2010に格納されたが、主要な核データライブラリであるENDFまたはJENDLには格納されていなかった。また、核データライブラリ間に有意な差があり、$$^{225}$$Raの生成量が有意に異なっており、核データの再評価、共分散データの整備などをJENDLへ提言した。

論文

Measurement of the neutron capture cross section of $$^{185}$$Re in the keV energy region

片渕 竜也*; 佐藤 八起*; 武部 花凛*; 井頭 政之*; 梅澤 征悟*; 藤岡 諒*; 齋藤 辰宏*; 岩本 信之

Journal of Nuclear Science and Technology, 61(2), p.224 - 229, 2024/02

https://doi.org/10.1080/00223131.2023.2298749
 被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)

Measurements of the neutron capture cross section of $$^{185}$$Re have been limited in the keV energy region. In addition, existing measured data have discrepancies. In this study, the neutron time-of-flight method was employed to measure the capture cross section of $$^{185}$$Re at Tokyo Institute of Technology. The capture $$gamma$$-rays were detected with a large volume NaI(Tl) detector. The pulse-height weighting technique was applied to obtain the capture yield. The present results were corrected for neutron scattered effects and impurities in the sample. The measured cross sections were determined with the standard capture cross section of gold in the energy range from 15 to 90 keV, and compared with measured and evaluated data. The results of the measurement provided improved accuracy relative to previous studies in the keV energy range.

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