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論文

Grain refinement of dual phase steel maximizes deformation ability of martensite, leading to simultaneous enhancement of strength and ductility

Park, M.-H.*; 柴田 曉伸*; Harjo, S.; 辻 伸泰*

Acta Materialia, 292, p.121061_1 - 121061_13, 2025/06

https://doi.org/10.1016/j.actamat.2025.121061
 被引用回数：1

Dual-phase (DP) steel, composed of soft ferrite and hard martensite, offers excellent strength-ductility balance and low cost. This study found that refining the DP microstructure enhanced both yield strength and strain hardening, improving strength and ductility. Digital image correlation (DIC) revealed strain localization in ferrite, but refinement reduced strain differences between ferrite and martensite, suppressing crack initiation. More ferrite/martensite interfaces promoted plasticity in martensite via enhanced deformation constraint. ${it In-situ}$ neutron diffraction showed martensite bore higher phase stress, which increased with refinement. By combining $$mu$$-DIC and neutron data, individual stress-strain curves for ferrite and martensite were constructed for the first time, explaining the strength-ductility synergy through interphase constraint. These findings offer guidance for designing heterostructured materials to overcome the strength-ductility trade-off.

論文

Spin density wave and van Hove singularity in the kagome metal CeTi$$_3$$Bi$$_4$$

Park, P.*; Ortiz, B. R.*; Spargue, M.*; Sakuya, A. P.*; Chen, S. A.*; Frontzek, M. D.*; Tian, W.*; Sibille, R.*; Mazzone, D. G.*; 田端 千紘; et al.

Nature Communications (Internet), 16, p.4384_1 - 4384_9, 2025/05

https://doi.org/10.1038/s41467-025-59460-4
 被引用回数：0

Kagome metals with van Hove singularities (VHSs) near the Fermi level can host intriguing quantum phenomena, including chiral loop currents, electronic nematicity, and unconventional superconductivity. However, unconventional magnetic states driven by VHSs, such as spin-density waves (SDWs), have yet to be observed experimentally in kagome metals. Here, we present a comprehensive investigation of the magnetic and electronic structure of the layered kagome metal CeTi$$_3$$Bi$$_4$$, where the Ti kagome electronic structure interacts with a magnetic sublattice of Ce$$^{3+}$$ $$J_{rm eff}$$ = 1/2 moments. Our findings establish the rare-earth Kagome metals LnTi3Bi4 as a model platform where characteristic electronic structure of the kagome lattice plays a pivotal role in magnetic order.

論文

Loading-direction dependence of non-basal slip activity in a pre-twinned AZ31 magnesium alloy

Go, J.*; Park, M.-H.*; Gao, S.*; 松宮 久*; Gong, W.; 辻 伸泰*

Journal of Alloys and Compounds, 1014, p.178749_1 - 178749_10, 2025/02

https://doi.org/10.1016/j.jallcom.2025.178749
 被引用回数：2 パーセンタイル：89.83(Chemistry, Physical)

In Mg alloys, basal dislocation slip is the preferential slip system that is activated at room temperature, while non-basal slips are typically difficult to activate owing to their high critical resolved shear stress. Until now, minimal focus has been directed towards the influence of loading direction on slip behavior in pre-twinned AZ31 alloys. This study employed transmission electron microscopy to demonstrate that non-basal slips, specifically prismatic and pyramidal I slips, are activated under deformation conditions where de-twinning is difficult in a pre-twinned AZ31 Mg alloy. When the tensile loading direction is parallel to the precompression direction, de-twinning and basal slip are the primary deformation modes. Conversely, when the tensile loading direction is perpendicular to the precompression direction, where de-twinning is challenging to activate, both basal and non-basal slips, such as prismatic and pyramidal I slips, emerge as the primary deformation modes. These results indicate that the pre-twinned AZ31 Mg alloy cannot deform solely through basal slips, and the activation of either de-twinning or non-basal slips is necessary to satisfy the von Mises criterion. Our findings in this study demonstrate the impact of non-basal slip activity on macroscopic yield stress and overall deformation, hence enhancing the understanding of magnesium alloy deformation mechanisms.

論文

Separating the transverse and longitudinal modes of $$phi$$, $$rho$$, $$K^{ast}$$ and $$K_1$$ mesons through their angular-dependent two-body decay modes

Park, I. W.*; 佐甲 博之; 青木 和也*; Gubler, P.; Lee, S. H.*

Journal of Subatomic Particles and Cosmology (Internet), 1-2, p.100014_1 - 100014_11, 2024/11

https://doi.org/10.1016/j.jspc.2024.100014

The mass shift a spin-1 particle moving in the nuclear medium will depend on its polarization direction. To study polarization-independent mass shifts in the medium, we explore methods to isolate each polarization direction of spin-1 mesons through the angular-dependent two-body decay modes. Specifically, we study $$phi to K^+ K^-$$, $$rho to pi pi$$, $$K^{ast} to K pi$$, $$phi to e^+ e^-$$ and $$K_1 to rho K$$ ($$K^{ast} pi$$) decays. Concerning $$K^{ast}$$ and $$K_1$$ mesons, since both particles have vacuum widths smaller than 100 MeV, they are ideal candidates for experimentally measuring chiral partners. The simultaneous observation of mass shifts of these chiral partners would provide valuable insights into the contribution of chiral symmetry breaking to the generation of hadron masses.

論文

Identifying the transverse and longitudinal modes of the $$K^{ast}$$ and $$K_1$$ mesons through their angular-dependent decay modes

Park, I. W.*; 佐甲 博之; 青木 和也*; Gubler, P.; Lee, S. H.*

Physical Review D, 109(11), p.114042_1 - 114042_10, 2024/06

https://doi.org/10.1103/PhysRevD.109.114042
 被引用回数：0 パーセンタイル：0.00(Astronomy & Astrophysics)

Observing the mass shifts of chiral partners will provide invaluable insight into the role of chiral symmetry breaking in the generation of hadron masses. Because both the $$K^{ast}$$ and $$K_1$$ mesons have vacuum widths smaller than 100 MeV, they are ideal candidates for realizing mass shift measurements. On the other hand, the different momentum dependence of the longitudinal and transverse modes smear the peak positions. In this work, we analyze the angular dependence of the two-body decays of both the $$K^{ast}$$ and $$K_1$$. It is found that the longitudinal and transverse modes of the $$K^{ast}$$ can be isolated by observing the pseudoscalar decay in either the forward or perpendicular directions, respectively. For the $$K_1$$ decaying into a vector meson and a pseudoscalar meson, one can accomplish the same goal by further observing the polarization of the vector meson through its angular dependence on the two pseudoscalar meson decay.

論文

Onset of collectivity for argon isotopes close to $$N=32$$

Linh, B. D.*; Corsi, A.*; Gillibert, A.*; Obertelli, A.*; Doornenbal, P.*; Barbieri, C.*; Duguet, T.*; G$'o$mez-Ramos, M.*; Holt, J. D.*; Hu, B. S.*; et al.

Physical Review C, 109(3), p.034312_1 - 034312_15, 2024/03

https://doi.org/10.1103/PhysRevC.109.034312
 被引用回数：2 パーセンタイル：58.81(Physics, Nuclear)

理化学研究所RIビームファクトリーにて中性子過剰核$$^{50}$$Arビームからの1中性子ノックアウト反応実験を行い、$$^{49}$$Arのエネルギー準位および分光学的因子を導出した。特に、第一励起状態の$$1/2^-$$への分光学的因子が大きいことから、始状態の$$^{50}$$Arの基底状態において中性子が$$p_{1/2}$$軌道を多く占めていることがわかった。これは、中性子数32がよい魔法数として知られる$$^{52}$$Caとは異なった性質であり、カルシウムからアルゴンへと陽子が2個減ることで閉殻構造が大きく崩れることが明らかになった。

論文

Composition dependence of bulk properties in the Co-intercalated transition metal dichalcogenide Co$$_{1/3}$$TaS$$_{2}$$

Park, P.*; Cho, W.*; Kim, C.*; An, Y.*; Avdeev, M.*; 飯田 一樹*; 梶本 亮一; Park, J.-G.*

Physical Review B, 109(6), p.L060403_1 - L060403_7, 2024/02

https://doi.org/10.1103/PhysRevB.109.L060403
 被引用回数：6 パーセンタイル：86.08(Materials Science, Multidisciplinary)

Spontaneous Hall conductivity has recently been reported in the triangular lattice antiferromagnet Co$$_{1/3}$$TaS$$_{2}$$ under a zero magnetic field. This phenomenon originates from the distinctive noncoplanar triple-$$mathbf{Q}$$ magnetic ground state, possessing uniform real-space Berry curvature characterized by scalar spin chirality. We investigated the physical properties of Co$$_{1/3}$$TaS$$_{2}$$ by judiciously controlling the composition, revealing a drastic change in its bulk properties, even by slight variations in cobalt composition, despite the same crystal structure. For $$0.299 le x le 0.325$$, Co$$_{x}$$TaS$$_{2}$$ keeps all the characteristics of the ground state consistent with the previous studies - two antiferromagnetic phase transitions at $$T_mathrm{N1}$$ and $$T_mathrm{N2}$$ ($$< T_mathrm{N1}$$), a large spontaneous Hall conductivity [$$sigma_{xy}(mathbf{H} = 0)$$], and a weak ferromagnetic moment along the $$c$$ axis. However, samples with $$x ge 0.330$$ exhibit distinct bulk properties, including the absence of both $$sigma_{xy}(mathbf{H} = 0)$$ and the weak ferromagnetic moment. Our neutron diffraction data reveal that Co$$_{x}$$TaS$$_{2}$$ with $$x ge 0.330$$ develops coplanar helical magnetic order with $$mathbf{q}_mathrm{m1} =(1/3, 0, 0)$$. This is entirely different from what has been seen in $$x le 0.325$$, explaining the observed composition dependence.

論文

Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co$$_{1/3}$$TaS$$_{2}$$

Park, P.*; Cho, W.*; Kim, C.*; An, Y.*; Kang, Y.-G.*; Avdeev, M.*; Sibille, R.*; 飯田 一樹*; 梶本 亮一; Lee, K. H.*; et al.

Nature Communications (Internet), 14, p.8346_1 - 8346_9, 2023/12

https://doi.org/10.1038/s41467-023-43853-4
 被引用回数：21 パーセンタイル：84.93(Multidisciplinary Sciences)

The triangular lattice antiferromagnet (TLAF) has been the standard paradigm of frustrated magnetism for several decades. The most common magnetic ordering in insulating TLAFs is the 120$$^{circ}$$ structure. However, a new triple-$$mathbf{Q}$$ chiral ordering can emerge in metallic TLAFs, representing the short wavelength limit of magnetic skyrmion crystals. We report the metallic TLAF Co$$_{1/3}$$TaS$$_{2}$$ as the first example of tetrahedral triple-$$mathbf{Q}$$ magnetic ordering with the associated topological Hall effect (non-zero $$sigma_{xy}(mathbf{H}=0)$$). We also present a theoretical framework that describes the emergence of this magnetic ground state, which is further supported by the electronic structure measured by angle-resolved photoemission spectroscopy. Additionally, our measurements of the inelastic neutron scattering cross section are consistent with the calculated dynamical structure factor of the tetrahedral triple-$$mathbf{Q}$$ state.

論文

Predictive and inverse modeling of a radionuclide diffusion experiment in crystalline rock at ONKALO (Finland)

Soler, J. M.*; Kek$"a$l$"a$inen, P.*; Pulkkanen, V.-M.*; Moreno, L.*; Iraola, A.*; Trinchero, P.*; Hokr, M.*; $v{R}$$'i$ha, J.*; Havlov$'a$, V.*; Trpko$v{s}$ov$'a$, D.*; et al.

Nuclear Technology, 209(11), p.1765 - 1784, 2023/11

https://doi.org/10.1080/00295450.2023.2209234
 被引用回数：4 パーセンタイル：73.39(Nuclear Science & Technology)

The REPRO-TDE test was performed at a depth of about 400 m in the ONKALO underground research facility in Finland. Synthetic groundwater containing radionuclide tracers (HTO, Cl-36, Na-22, Ba-133, Cs-134) was circulated for about four years in a packed-off interval of the injection borehole. Tracer activities were additionally monitored in two observation boreholes. The test was the subject of a modelling exercise by the SKB GWFTS Task Force. Eleven teams participated in the exercise, using different model concepts and approaches. Predictive model calculations were based on laboratory-based information concerning porosities, diffusion coefficients and sorption partition coefficients. After the experimental results were made available, the teams were able to revise their models to reproduce the observations. General conclusions from these back-analysis calculations include the need for reduced effective diffusion coefficients for Cl-36 compared to those applicable to HTO (anion exclusion), the need to implement weaker sorption for Na-22, compared to results from laboratory batch-sorption experiments, and the observation of large differences between the theoretical initial concentrations for the strongly-sorbing Ba-133 and Cs-134 and the first measured values a few hours after tracer injection. Different teams applied different concepts, concerning mainly the implementation of isotropic vs. anisotropic diffusion, or the possible existence of Borehole Disturbed Zones around the different boreholes. The role of microstructure was also addressed in two of the models.

論文

Quantitatively evaluating respective contribution of austenite and deformation-induced martensite to flow stress, plastic strain, and strain hardening rate in tensile deformed TRIP steel

Mao, W.; Gao, S.*; Gong, W.; Bai, Y.*; Harjo, S.; Park, M.-H.*; 柴田 曉伸*; 辻 伸泰*

Acta Materialia, 256, p.119139_1 - 119139_16, 2023/09

https://doi.org/10.1016/j.actamat.2023.119139
 被引用回数：33 パーセンタイル：97.68(Materials Science, Multidisciplinary)

変形誘起塑性(TRIP)鋼は、変形誘起マルテンサイト変態(DIMT)に伴う加工硬化率の向上により、強度と延性の優れた組み合わせを示す。TRIP鋼や合金の加工硬化挙動におけるDIMTの役割を定量的に評価することは、強度と延性の両立を可能にする先進材料を設計するための指針を与えるが、変形中に相組成が変化し続け、応力と塑性ひずみの両方が構成相間で動的に分配されるため、その評価は困難である。本研究では、Fe-24Ni-0.3C(wt.%)TRIPオーステナイト鋼の引張変形とその場中性子回折測定を行った。中性子回折測定による応力分割と相分割に基づく解析手法を提案し、試験片の引張流動応力と加工硬化率を、オーステナイト母相,変形誘起マルテンサイト、DIMT変態速度に関連する因子に分解し、試料の加工硬化挙動における各因子の役割を考察した。さらに、回折プロファイル解析により測定した転位密度を用いてオーステナイトとマルテンサイト間の塑性ひずみ分配を間接的に推定し、材料中のオーステナイトとマルテンサイト間の応力・ひずみ分配の全体像を構築した。その結果、変形誘起マルテンサイト変態速度とマルテンサイトが負担する相応力の両方が、材料の全体的な引張特性に重要な役割を果たしていることが示唆された。提案した分解解析法は、TRIP現象を示す多相合金の機械的挙動を調べるために広く適用できる可能性がある。

論文

Non-destructive elemental analysis of lunar meteorites using a negative muon beam

Chiu, I.-H.; 寺田 健太郎*; 大澤 崇人; Park, C.*; 竹下 聡史*; 三宅 康博*; 二宮 和彦*

Meteoritics & Planetary Science, 58(9), p.1333 - 1344, 2023/09

https://doi.org/10.1111/maps.14059
 被引用回数：0 パーセンタイル：0.00(Geochemistry & Geophysics)

We report the result of a non-destructive elemental analysis of lunar meteorites using a negative muon beam at J-PARC. An experimental system of six Ge semiconductor detectors and a newly designed He analysis chamber (to enable quantitative analysis of Al) was used to provide a high signal-to-noise ratio for the detection of major elements from lunar rocks (Mg, Si, Fe, O, Ca, and Al). We performed a Monte Carlo simulation to determine the chemical compositions at two sides and the center of a sample (at depths of 0.33 and 0.96 mm below the sample surface, respectively) of the lunar meteorite DEW 12007. These results indicate that the three interior regions of DEW 12007 are likely to be 55.8:44.2, 51.4:48.6, and 54.4:45.6 wt% mixtures of anorthositic and basaltic clasts, respectively. This study is the first quantitative analysis of a heterogeneous meteorite interior using a negative muon beam. As elemental analysis using a muon beam is non- destructive and highly sensitive to light elements, including C, N, and O, the protocols established in this study are applicable to initial characterization of returned samples from the South Pole of the Moon.

論文

Level structures of $$^{56,58}$$Ca cast doubt on a doubly magic $$^{60}$$Ca

Chen, S.*; Browne, F.*; Doornenbal, P.*; Lee, J.*; Obertelli, A.*; 角田 佑介*; 大塚 孝治*; 茶園 亮樹*; Hagen, G.*; Holt, J. D.*; et al.

Physics Letters B, 843, p.138025_1 - 138025_7, 2023/08

https://doi.org/10.1016/j.physletb.2023.138025
 被引用回数：9 パーセンタイル：85.35(Astronomy & Astrophysics)

$$^{57,59}$$Scからの1陽子ノックアウト反応を用いて、$$^{56}$$Caと$$^{58}$$Caのガンマ崩壊を観測した。$$^{56}$$Caでは1456(12)keVの$$gamma$$線遷移が、$$^{58}$$Caでは1115(34)keVの遷移が観測された。どちらの遷移も暫定的に$$2^{+}_{1} rightarrow 0^{+}_{gs}$$と割り当てられた。有効核子間相互作用をわずかに修正した広い模型空間での殻模型計算では、$$2^{+}_{1}$$準位エネルギー、2中性子分離エネルギー、反応断面積が実験とよく一致し、N=34閉殻の上に新しい殻が形成されていることを裏付けた。その構成要素である$$0_{f5/2}$$と$$0_{g9/2}$$軌道はほぼ縮退しており、これは$$^{60}$$Caが二重魔法核である可能性を排除し、Ca同位体のドリップラインを$$^{70}$$Caあるいはそれ以上にまで広げる可能性がある。

論文

Disentangling longitudinal and transverse modes of the $$phi$$ meson through dilepton and kaon decays

Park, I. W.*; 佐甲 博之; 青木 和也*; Gubler, P.; Lee, S. H.*

Physical Review D, 107(7), p.074033_1 - 074033_9, 2023/04

https://doi.org/10.1103/PhysRevD.107.074033
 被引用回数：10 パーセンタイル：77.80(Astronomy & Astrophysics)

Angular distributions of $$phi$$ meson decay amplitudes of $$e^+e^-$$ and $$K^+K^-$$ channels are computed using both specific interaction Lagrangians and simple arguments relying on angular momentum conservation. Based on the obtained results, we assess methods to experimentally disentangle the longitudinal and transverse polarization modes of the $$phi$$ meson and discuss advantages and disadvantages of employing either the leptonic or hadronic decay modes for this task.

論文

Multiple mechanisms in proton-induced nucleon removal at $$sim$$100 MeV/nucleon

Pohl, T.*; Sun, Y. L.*; Obertelli, A.*; Lee, J.*; G$'o$mez-Ramos, M.*; 緒方 一介*; 吉田 数貴; Cai, B. S.*; Yuan, C. X.*; Brown, B. A.*; et al.

Physical Review Letters, 130(17), p.172501_1 - 172501_8, 2023/04

https://doi.org/10.1103/PhysRevLett.130.172501
 被引用回数：12 パーセンタイル：88.25(Physics, Multidisciplinary)

大きなフェルミ面非対称性を持つ陽子過剰な$$^{14}$$O原子核からの100MeV/nucleonでの陽子による陽子・中性子除去反応について報告した。この結果は、quasi-freeノックアウト反応、非弾性散乱、核子移行反応を含む複数の反応機構の定量的寄与を初めて示すものである。このようなエネルギー領域では通常無視される非弾性散乱と核子移行の寄与が、弱束縛陽子と強束縛中性子の除去反応断面積にそれぞれ約50%と30%寄与していることが示された。

論文

Non-destructive elemental analysis of lunar materials with negative muon beam at J-PARC

Chiu, I.-H.; 寺田 健太郎*; 大澤 崇人; Park, C.*; 竹下 聡史*; 三宅 康博*; 二宮 和彦*

Journal of Physics; Conference Series, 2462, p.012004_1 - 012004_6, 2023/03

https://doi.org/10.1088/1742-6596/2462/1/012004
 被引用回数：1 パーセンタイル：71.57(Physics, Applied)

今までの10年間で、負のミュオンビームを使用した非破壊元素分析が進歩しつつある。この方法では、サンプルに損傷を与えることなく、バルク材料の元素組成を決定するために使用できる。本研究では、ステンレス製の分析チャンバーに設置されたNWA482隕石の負ミュオン照射実験を行った。分析チャンバーにはヘリウムガスが充填され、空気散乱ミュオンによるバックグラウンド信号が抑制された。試料中のAl, Fe, Ca, Mg, Si, OからのミュオンX線は、分析チャンバーの周囲に配置された6つのゲルマニウム半導体検出器を使用して検出された。サンプルのX線自己吸収効果を補正するために、さらにGeant4ツールキットによるモンテカルロシミュレーションを使用した。シミュレーションからの補正を導入し、ミュオンX線測定の定量分析を行った。その結果、NWA482データに基づいて隕石中の各元素の分析感度を調べることに成功した。

論文

Third international challenge to model the medium- to long-range transport of radioxenon to four Comprehensive Nuclear-Test-Ban Treaty monitoring stations

Maurer, C.*; Galmarini, S.*; Solazzo, E.*; Ku$'s$mierczyk-Michulec, J.*; Bar$'e$, J.*; Kalinowski, M.*; Schoeppner, M.*; Bourgouin, P.*; Crawford, A.*; Stein, A.*; et al.

Journal of Environmental Radioactivity, 255, p.106968_1 - 106968_27, 2022/12

https://doi.org/10.1016/j.jenvrad.2022.106968
 被引用回数：5 パーセンタイル：34.89(Environmental Sciences)

2015, 2016年のモデル比較演習を経て、2019年に包括的なXe-133大気輸送モデル比較試験を企画した。欧米の医療用RI製造施設であるIREやCNLからの排出の影響が大きいヨーロッパと北米にある4つのCTBT国際モニタリングシステム局を対象とし、約30の参加モデルの結果の比較とアンサンブルを実施した。第2回ATMチャレンジの教訓により、参加者は事務局の指定する条件に基づいて計算を実施した。その結果、IREとCNLからの正確な日別スタック排出量を使用しても、拡散過程における誤差、残存排出源の適切な特性化、長いIMSサンプリング時間(12$$sim$$24時間)のデメリットと相殺され、平均すればスコアの改善が見られないことが確認された。一方、任意のモデル計算結果を用いたアンサンブルを実施したところ、今回対象とした4つの観測所でのXe-133バックグラウンドを十分に予測できることが確認できた。有効なアンサンブルのサイズは5以下であった。

論文

"Southwestern" boundary of the $$N = 40$$ island of inversion; First study of low-lying bound excited states in $$^{59}$$V and $$^{61}$$V

Elekes, Z.*; Juh$'a$sz, M. M.*; Sohler, D.*; Sieja, K.*; 吉田 数貴; 緒方 一介*; Doornenbal, P.*; Obertelli, A.*; Achouri, N. L.*; 馬場 秀忠*; et al.

Physical Review C, 106(6), p.064321_1 - 064321_10, 2022/12

https://doi.org/10.1103/PhysRevC.106.064321
 被引用回数：3 パーセンタイル：32.42(Physics, Nuclear)

$$^{59}$$Vと$$^{61}$$Vの低励起準位構造を初めて探索した。$$^{61}$$Vについては中性子ノックアウト反応と陽子非弾性散乱が、$$^{59}$$Vについては中性子ノックアウト反応データが得られた。$$^{59}$$Vについては4つ、$$^{61}$$Vについては5つの新たな遷移が確認された。Lenzi-Nowacki-Poves-Sieja (LNPS)相互作用に基づく殻模型計算との比較によって、それぞれの同位体について確認されたガンマ線のうち3つが、first 11/2$$^{-}$$状態とfirst 9/2$$^{-}$$状態からの崩壊と決定された。$$^{61}$$Vについては、($$p$$,$$p'$$)非弾性散乱断面積は四重極変形と十六重極変形を想定したチャネル結合法により解析されたが、十六重極変形の影響により、明確に反転の島に属するとは決定できなかった。

論文

Extended $$p_{3/2}$$ neutron orbital and the $$N = 32$$ shell closure in $$^{52}$$Ca

Enciu, M.*; Liu, H. N.*; Obertelli, A.*; Doornenbal, P.*; Nowacki, F.*; 緒方 一介*; Poves, A.*; 吉田 数貴; Achouri, N. L.*; 馬場 秀忠*; et al.

Physical Review Letters, 129(26), p.262501_1 - 262501_7, 2022/12

https://doi.org/10.1103/PhysRevLett.129.262501
 被引用回数：18 パーセンタイル：84.65(Physics, Multidisciplinary)

$$sim$$230MeV/nucleonでの$$^{52}$$Caからの中性子ノックアウト反応が$$gamma$$線分光と行われ、$$1f_{7/2}$$と$$2p_{3/2}$$軌道からの中性子ノックアウト反応の運動量分布が測定された。断面積は$$N=32$$の閉殻と整合し、Ca同位体での$$N=28$$と$$N=34$$閉殻と同程度に強い閉殻であることが確認された。運動量分布の分析から$$1_{f7/2}$$と$$2p_{3/2}$$軌道の平均二乗根半径の差は0.61(23)fmと決定され、これはmodified-shell-modelによる予言の0.7fmと整合した。これは、中性子過剰なCa同位体での$$2p_{3/2}$$軌道半径が大きいことが、中性子数にしたがって線形的に荷電半径が増える意外な現象の原因であることを示唆している。

論文

Accelerating the adoption of advanced manufacturing technologies for Gen IV nuclear reactors through international collaboration

Van Rooyen, I. J.*; Ivan, L.*; Messner, M.*; Edwards, L.*; Abonneau, E.*; 上地 優; Lowe, S.*; Nilsson, K.-F.*; 岡島 智史; Pouchon, M.*; et al.

Proceedings of 4th International Conference on Generation IV and Small Reactors (G4SR-4), p.2 - 12, 2022/10

Developments in advanced manufacturing (AM) are occurring faster than the ability to introduce new materials and methods into design codes. Qualifying new AM technologies for use with nuclear design codes can be a long and complex process. The Generation IV International Forum (GIF) Advanced Manufacturing Materials Engineering Task Force (AMME-TF), focuses on how collaborative AM R&D could be used to decrease time to deployment of Gen-IV reactors. This paper provides a critical review of 2019 and 2021 surveys sampling nuclear reactor vendors, supply chain specialists, regulators, and other experts in GIF member countries. Both surveys confirmed that many AM technologies were considered opportunities by potential end users, although 90% of respondents identified the creation and approval of codes and standards as the greatest obstacle to their adoption. Industry prioritization on AM technologies, components and materials changed significantly during the three-year timespan. Additionally, the paper summarizes a 2021 modeling & simulation workshop that developed ideas on how to accelerate the qualification of AM and synthesizes the survey results and workshop conclusions into a review of critical research gaps and paths to address these gaps, particularly through international collaboration.

論文

Modelling of the LTDE-SD radionuclide diffusion experiment in crystalline rock at the $"A$sp$"o$ Hard Rock Laboratory (Sweden)

Soler, J. M.*; Meng, S.*; Moreno, L.*; Neretnieks, I.*; Liu, L.*; Kek$"a$l$"a$inen, P.*; Hokr, M.*; $v{R}$$'i$ha, J.*; Vete$v{s}$n$'i$k, A.*; Reimitz, D.*; et al.

Geologica Acta, 20(7), 32 Pages, 2022/07

https://doi.org/10.1344/GeologicaActa2022.20.7
 被引用回数：3 パーセンタイル：47.27(Geology)

亀裂性岩石中の地下水流動と物質移行のモデル化に関するSKBタスクフォースにおけるTask 9Bは、スウェーデンのエスポ岩盤研究所で実施された原位置長期収着・拡散試験(LTDE-SD)の試験結果のモデル化に焦点をあてたものである。10のモデリングチームによって、異なるモデル概念やコードを用いたモデル化が実施された。モデル化のアプローチは、(1)拡散方程式の解析解、(2)連続多孔質媒体中の数値計算モデル、(3)微細な不均質性(鉱物粒界,微細亀裂の分布等)を考慮した微細構造モデルの大きく3種に分類できる。異なるチームによるモデル化結果から、岩石や亀裂の表面の擾乱影響を含む岩石特性の不均質な分布、微細な亀裂の効果など、様々な異なるモデル概念の比較・評価がなされた。

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