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論文

Measurements of neutron capture cross-section for nuclides of interest in decommissioning (II); $$^{58}$$Fe(n,$$gamma$$)$$^{59}$$Fe

中村 詔司; 芝原 雄司*; 遠藤 駿典; Rovira Leveroni, G.; 木村 敦

Journal of Nuclear Science and Technology, 62(3), p.300 - 307, 2025/03

https://doi.org/10.1080/00223131.2024.2427244
 被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)

As nuclear facilities are dismantled in decommissioning, large amount of various waste is generated. Even more inconveniently, waste is radioactive due to neutron activation. Thus, the neutron capture cross-sections of nuclides targeted in decommissioning are required to evaluate the radioactivity produced. In this work, $$^{58}$$Fe nuclide was selected among objective nuclides for decommissioning, and its thermal-neutron capture cross-section was measured by a neutron activation method at the graphite thermal column of Kyoto University Research Reactor in 5-MW operation. The thermal-neutron capture cross-section was derived using ${it Westcott'}$s convention. The present work obtained 1.36$$pm$$0.03 barns for the $$^{58}$$Fe(n,$$gamma$$)$$^{59}$$Fe reaction. The present result supports the JENDL-5 evaluation within 2$$sigma$$. If updated with currently recommended nuclear data, some of the reported past data would support the present result.

論文

Transverse asymmetry of individual $$gamma$$ rays in the $$^{139}$$La($$overrightarrow{n},gamma$$)$$^{140}$$La reaction

奥泉 舞桜*; Auton, C. J.*; 遠藤 駿典; 藤岡 宏之*; 広田 克也*; 猪野 隆*; 石崎 貢平*; 木村 敦; 北口 雅暁*; 古賀 淳*; et al.

Physical Review C, 111(3), p.034611_1 - 034611_6, 2025/03

https://doi.org/10.1103/PhysRevC.111.034611
 被引用回数：0

The observed enhancement of Parity Violation in the vicinity of p-wave compound nuclear resonances for a variety of medium-heavy nuclei can be understood using the sp-mixing model. The sp-mixing model predicts several neutron energy-dependent angular correlations between the spin and momentum of neutron and $$gamma$$-ray emitted from (n,$$gamma$$) reactions. In this work, the correlation term $$overrightarrow{sigma_textrm{n}}cdot(overrightarrow{k_textrm{n}}timesoverrightarrow{k_gamma})$$ in the $$^{139}$$La($$overrightarrow{n}$$,$$gamma$$)$$^{140}$$La$$^ast$$ reaction was measured precisely and a significant transverse asymmetry was found in the transition to the excited states of $$^{140}$$La.

論文

Measurements of neutron capture cross-section for nuclides of interest in decommissioning (III); $$^{170}$$Er(n,$$gamma$$)$$^{171}$$Er and $$^{180}$$Hf(n,$$gamma$$)$$^{181}$$Hf reactions

中村 詔司; 芝原 雄司*; 遠藤 駿典; Rovira Leveroni, G.; 木村 敦

Journal of Nuclear Science and Technology, 14 Pages, 2025/00

https://doi.org/10.1080/00223131.2025.2457589
 被引用回数：0 パーセンタイル：0.00(Nuclear Science & Technology)

In the decommissioning of nuclear facilities, large amounts of radioactive waste are generated due to neutron activation. In that case, neutron capture cross-sections of nuclides targeted in decommissioning are required to evaluate their radioactivities produced. The present study selected two nuclides, $$^{171}$$Er and $$^{181}$$Hf, among objective ones for decommissioning, and thermal-neutron capture cross-sections for their parent nuclides were measured by the neutron activation method at the Kyoto University Research Reactor under 1-MW operation. The thermal-neutron capture cross-sections were derived on the basis of Westcott's convention. The present study obtained the results as follows: 8.19$$pm$$0.35 barns for the $$^{170}$$Er(n,$$gamma$$)$$^{171}$$Er reaction and 13.57$$pm$$0.14 barns for the $$^{180}$$Hf(n,$$gamma$$)$$^{181}$$Hf reaction. As a by-product, the measurements of the Hf sample also yielded 0.427$$pm$$0.006 barns for the $$^{179}$$Hf(n,$$gamma$$)$$^{180m}$$Hf reaction. This study revealed that some experimental and data evaluations differ from the present results by more than the experimental uncertainties.

論文

Measurements of neutron capture cross-sections for nuclides of interest in decommissioning; $$^{45}$$Sc, $$^{63}$$Cu, $$^{64}$$Zn, $$^{109}$$Ag, and $$^{113}$$In

中村 詔司; 芝原 雄司*; 遠藤 駿典; Rovira Leveroni, G.; 木村 敦

Journal of Nuclear Science and Technology, 61(11), p.1415 - 1430, 2024/11

https://doi.org/10.1080/00223131.2024.2346347
 被引用回数：1 パーセンタイル：62.55(Nuclear Science & Technology)

廃止措置においては、生成放射能の評価に資する核データとして、中性子捕獲断面積を整備する必要がある。本研究では、整備すべき対象核種のうち$$^{45}$$Sc, $$^{63}$$Cu, $$^{65}$$Zn, $$^{109}$$Ag及び$$^{113}$$Inを選定し、KURのTC-Pnを用いてそれらの熱中性子捕獲断面積測定を行った。その結果、熱中性子捕獲断面積の結果が、以下のとおり得られた:$$^{45}$$Sc(n, $$gamma$$)$$^{46}$$Sc反応は27.18$$pm$$0.28 barn、$$^{63}$$Cu(n, $$gamma$$)$$^{64}$$Cu反応は4.34$$pm$$0.06 barn、$$^{64}$$Zn(n, $$gamma$$)$$^{65}$$Zn反応は0.719$$pm$$0.011 barn、$$^{109}$$Ag(n, $$gamma$$)$$^{rm 110m}$$Ag反応は4.05$$pm$$0.05 barn、そして$$^{113}$$In(n, $$gamma$$) $$^{114}$$In$$^{m1+m2}$$反応は8.53$$pm$$0.27 barn。ScとZnの結果は、これまでに報告されている評価値を誤差範囲で支持するが、一方、他の核種については評価値と異なる結果となった。得られた結果は、生成量評価にはもちろん、これらの核種を中性束モニタとして利用する場合に用いることが考えられる。

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：2 パーセンタイル：0.00(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 measurements at TC-Pn in KUR for nuclides of concern in decommissioning

中村 詔司; 遠藤 駿典; Rovira Leveroni, G.; 木村 敦; 芝原 雄司*

KURNS Progress Report 2023, P. 46, 2024/07

本研究は、生成放射能を評価するために、廃止措置で問題となる核種について熱中性子捕獲断面積を測定するものである。本件では、対象核種の中から$$^{58}$$Fe、$$^{170}$$Erおよび$$^{180}$$Hfを選定し、京大原子炉にて放射化法によりそれらの熱中性子捕獲断面積を測定した。今回、$$^{58}$$Fe(n,$$gamma$$)$$^{59}$$Fe反応について1.23$$pm$$0.03 barn、$$^{170}$$Er(n,$$gamma$$)$$^{171}$$Er反応について8.19$$pm$$0.35 barnを、そして$$^{180}$$Hf(n,$$gamma$$)$$^{181}$$Hf反応について13.57$$pm$$0.14 barnを得た。また、Hf試料の測定において副産物として、$$^{179}$$Hf(n,$$gamma$$)$$^{180m}$$Hf反応について0.427$$pm$$0.006 barnを得た。評価済みデータライブラリに採用されているデータは、今回得られた結果の不確かさ以上に違うことを明らかにした。

論文

Pushing the high count rate limits of scintillation detectors for challenging neutron-capture experiments

Balibrea-Correa, J.*; 木村 敦; 他133名*

Nuclear Instruments and Methods in Physics Research A, 1064, p.169385_1 - 169385_13, 2024/07

https://doi.org/10.1016/j.nima.2024.169385
 被引用回数：2 パーセンタイル：82.82(Instruments & Instrumentation)

A Monte Carlo method for detectors using the Total Energy Deposition principle (which is obtained via application of the PHWT) was proposed. In this method, both dead-time and pile-up effects are considered simultaneously in a consistent manner. To validate this method in harsh count rate conditions, we have applied it to two different types of C$$_6$$D$$_6$$ liquid scintillators at different count rate conditions and demonstrated the capability to account for these effects in neutron-capture cross-section measurements at the CERN n_TOF facility. The method brings very good results under the count rates up to $$sim$$8 c/$$mu$$s.

論文

Shedding light on the origin of $$^{204}$$Pb, the heaviest $$s$$-process; Only isotope in the solar system

Casanovas-Hoste, A.*; 原田 秀郎; 木村 敦; 他130名*

Physical Review Letters, 133(5), p.052702_1 - 052702_8, 2024/07

https://doi.org/10.1103/PhysRevLett.133.052702
 被引用回数：1 パーセンタイル：53.15(Physics, Multidisciplinary)

$$^{204}$$Tl(n, $$gamma$$) cross section was measured at the CERN neutron time-of-flight facility n_TOF, employing a sample of only 9 mg of $$^{204}$$Tl produced at the Institute Laue Langevin high flux reactor. At the $$s$$-process temperatures of kT $$approx$$ 8 keV and kT $$approx$$ 30 keV, Maxwellian-averaged cross sections (MACS) of 580(168) mb and 260(90) mb, respectively. These figures are about 3% lower and 20% higher than the corresponding values widely used in astrophysical calculations, which were based only on theoretical calculations. By using the new $$^{204}$$Tl MACS, the uncertainty arising from the $$^{204}$$Tl(n, $$gamma$$) cross section on the $$s$$-process abundance of $$^{204}$$Pb has been reduced from $$sim$$30% down to +8%/-6%, and the $$s$$-process calculations are in agreement with the latest solar system abundance of $$^{204}$$Pb reported by K. Lodders in 2021.

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：0 パーセンタイル：0.00(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

Total and double differential scattering cross-section measurements of isotropic graphite

木村 敦; 遠藤 駿典; 中村 詔司

EPJ Web of Conferences, 294, p.01002_1 - 01002_7, 2024/04

https://doi.org/10.1051/epjconf/202429401002

The total and double differential scattering cross sections (DDSCS) of graphite have been measured in the Materials and Life Science Experimental Facility (MLF) in the J-PARC. The DDSCS were measured using the Beam Line No.14 (AMATERAS) in the MLF. The data were normalized using those of vanadium as a standard. Small angle scattering and Bragg edges were observed, and their intensities varied among the samples. The neutron total cross sections in the energy region from 1 to 100 meV were measured using Beam Line No.04 (ANNRI) in the MLF. In the epithermal range (over 40 meV), all samples tended to have values close to the free atom cross-section of graphite. However, at the first Bragg edge, the deduced total cross sections by those samples started to separate from each other. The difference became more significant with decreasing the neutron energy, and the value tended to increase with the grain size of the sample. The results of these measurements suggest that the discrepancies between the derived total cross sections in the low-energy region are due to small-angle scattering caused by grains of graphite with uniform size.

論文

Evaluation of thermal neutron scattering law of nuclear-grade isotropic graphite

中山 梓介; 岩本 修; 木村 敦

EPJ Web of Conferences, 294, p.07001_1 - 07001_6, 2024/04

https://doi.org/10.1051/epjconf/202429407001

溶融塩炉などの革新型原子炉の減速材として黒鉛の利用が考えられている。減速材による熱中性子の散乱は炉心設計に大きな影響を与える。革新型原子炉の開発に貢献するため、原子炉級黒鉛の熱中性子散乱則の評価を行った。格子振動に起因する非弾性散乱成分は、第一原理シミュレーションから求めたフォノン状態密度に基づいて評価した。シミュレーションは理想的な結晶黒鉛に対して行った。結晶構造に起因する干渉性弾性散乱成分は、J-PARC/MLF施設で実施された中性子透過実験および散乱実験に基づいて評価した。中性子透過実験との比較においては、空孔などの結晶よりも大きな構造に起因する中性子小角散乱の定量が重要であることがわかった。以上の方法に基づいて、原子炉級黒鉛の熱中性子散乱則データを評価した。

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：1 パーセンタイル：27.70(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

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：27.70(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

High sensitivity of a future search for effects of $$P$$-odd/$$T$$-odd interactions on the 0.75 eV $$p$$-wave resonance in $$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$ forward transmission determined using a pulsed neutron beam

中部 倫太郎*; Auton, C. J.*; 遠藤 駿典; 藤岡 宏之*; Gudkov, V.*; 広田 克也*; 井出 郁央*; 猪野 隆*; 石角 元志*; 神原 理*; et al.

Physical Review C, 109(4), p.L041602_1 - L041602_4, 2024/04

https://doi.org/10.1103/PhysRevC.109.L041602
 被引用回数：1 パーセンタイル：0.00(Physics, Nuclear)

Neutron transmission experiments can offer a new type of highly sensitive search for time-reversal invariance violating (TRIV) effects in nucleon-nucleon interactions via the same enhancement mechanism observed for large parity violating (PV) effects in neutron-induced compound nuclear processes. In these compound processes, the TRIV cross-section is given as the product of the PV cross-section, a spin-factor $$kappa$$, and a ratio of TRIV and PV matrix elements. We determined $$kappa$$ to be 0.59 $$pm$$ 0.05 for $$^{139}$$La+n using both (n, $$gamma$$) spectroscopy and ($$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$) transmission. This result quantifies for the first time the high sensitivity of the $$^{139}$$La 0.75 eV $$p$$-wave resonance in a future search for $$P$$-odd/$$T$$-odd interactions in ($$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$) forward transmission.

論文

A Segmented Total Energy Detector (sTED) optimized for (n,$$gamma$$) cross-section measurements at n_TOF EAR2

Alcayne, V.*; 木村 敦; 他134名*

Radiation Physics and Chemistry, 217, p.111525_1 - 111525_11, 2024/04

https://doi.org/10.1016/j.radphyschem.2024.111525
 被引用回数：5 パーセンタイル：96.86(Chemistry, Physical)

The neutron time-of-flight facility n_TOF at CERN is a spallation source dedicated to measurements of neutron induced reaction cross-sections of interest in nuclear technologies, astrophysics, and other applications. Since 2014, Experimental ARea 2 (EAR2) is operational and delivers a neutron fluence of $$4 times 10^7$$ neutrons per nominal proton pulse, which is 50 times higher than the one of the other experimental area. The high neutron flux at EAR2 results in high counting rates in the detectors that challenged the previously existing capture detection systems. For this reason, a Segmented Total Energy Detector (sTED) has been developed to overcome the limitations in the detector's response, by reducing the active volume and by using a photo-multiplier (PMT) optimized for high counting rates. This paper presents the main characteristics of the sTED, including energy and time resolution, response to $$gamma$$-rays, and provides details for the Pulse Height Weighting Technique (PHWT). The sTED has been validated to perform neutron-capture cross-section measurements in EAR2 in the neutron energy range from thermal up to at least 400 keV.

論文

Measurement of the prompt fission $$gamma$$-rays from slow neutron-induced fission of $$^{235}$$U with STEFF

Wright, T.*; 原田 秀郎; 木村 敦; 他121名*

European Physical Journal A, 60(3), p.70_1 - 70_11, 2024/03

https://doi.org/10.1140/epja/s10050-024-01277-8
 被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)

The average energy and multiplicity of prompt $$gamma$$-rays from slow neutron-induced fission of $$^{235}$$U have been measured using the STEFF spectrometer at the neutron time-of-flight facility n_TOF. The individual responses from 11 NaI scintillators were corrected for multiple $$gamma$$-ray interactions, prompt fission neutrons and background counts before being deconvolved to estimate the emitted spectrum of prompt fission $$gamma$$-rays. The results give an average $$gamma$$-ray energy $$bar{E}_{gamma}$$ of 1.71(5) MeV and multiplicity $$bar{nu}_{gamma}$$ of 2.66(18) considering $$gamma$$-rays emitted within the energy range from 0.8 to 6.8 MeV. The n_TOF data has a slightly larger $$bar{E}_{gamma}$$ and smaller $$bar{nu}_{gamma}$$ than other recent measurements, however the product of the two is in agreement within the quoted uncertainties.

論文

Measurement of the $$^{140}$$Ce(n, $$gamma$$) cross section at n_TOF and its astrophysical implications for the chemical evolution of the universe

Amaducci, S.*; 原田 秀郎; 木村 敦; 他130名*

Physical Review Letters, 132(12), p.122701_1 - 122701_8, 2024/03

https://doi.org/10.1103/PhysRevLett.132.122701
 被引用回数：2 パーセンタイル：72.87(Physics, Multidisciplinary)

$$^{140}$$Ce(n,$$gamma$$) is a key reaction for slow neutron-capture ($$s$$-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty $$approx$$ 5%) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron-sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the s-process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars.

報告書

Proceedings of the 2022 Symposium on Nuclear Data; November 17-18, 2022, BLOSSOM CAF$'E$, Main Campus, Kindai University, Higashiosaka City, Osaka, Japan

執行 信寛*; 木村 敦; 佐野 忠史*

JAEA-Conf 2023-001, 146 Pages, 2024/02

JAEA-Conf-2023-001.pdf:11.2MB

2022年度核データ研究会は、2022年11月17日$$sim$$18日に、大阪府東大阪市にある近畿大学東大阪キャンパスのBLOSSOM CAF$'E$多目的ホールにて開催された。本研究会は、日本原子力学会核データ部会が主催、日本原子力学会「シグマ」調査専門委員会、日本原子力研究開発機構原子力基礎工学研究センター、高エネルギー加速器研究機構が共催した。チュートリアルとして、「我が国の原子炉物理学実験的研究の歴史」を、講演・議論のセッションとして、「核データに関する最近の話題」2セッションを実施した。さらにポスターセッションでは実験、理論、評価、ベンチマーク、応用など幅広い内容について発表が行われた。参加者数は76名で、それぞれの口頭発表およびポスター発表では活発な質疑応答が行われた。本報告書は、本研究会における口頭発表4件、ポスター発表18件の合計22の論文を掲載している。

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

Measurements of neutron total and capture cross sections of $$^{139}$$La and evaluation of resonance parameters

遠藤 駿典; 河村 しほり*; 奥平 琢也*; 吉川 大幹*; Rovira Leveroni, G.; 木村 敦; 中村 詔司; 岩本 修; 岩本 信之

European Physical Journal A, 59(12), p.288_1 - 288_12, 2023/12

https://doi.org/10.1140/epja/s10050-023-01203-4
 被引用回数：2 パーセンタイル：28.72(Physics, Nuclear)

ランタン(La)-139の断面積と共鳴パラメータは、原子力分野への応用や基礎核物理の研究にとって重要である。本論文では、大強度陽子加速器施設(J-PARC)のANNRIにてLaの中性子全断面積と捕獲断面積を測定した。Negative共鳴を含む4つの共鳴の共鳴パラメータを、共鳴解析コードREFITを用いて求めた。その結果いくつかの共鳴パラメータにおいて、評価済み核データライブラリとの不一致が見られた。さらに全断面積を再現するために、スピン依存する散乱半径もフィットした。得られた散乱半径は、評価済み核データライブラリで記録されたものよりも大きいことがわかった。

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