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論文

Deformation and magicity in heavy actinides; First observation of the ground-state rotational band of $$^{252}$$Fm

Orlandi, R.; 浅井 雅人; 牧井 宏之; 西尾 勝久; 廣瀬 健太郎; 塚田 和明; 佐藤 哲也; 伊藤 由太; 洲嵜 ふみ; 永目 諭一郎*; et al.

Physical Review Letters, 137(8), p.082501_1 - 082501_6, 2026/08

https://doi.org/10.1103/7gzt-ldn5
 被引用回数：1

The ground-state rotational band of $$^{252}$$Fm ($$Z$$ = 100, $$N$$ = 152) was investigated using two different experimental setups at the JAEA Tandem Accelerator Laboratory. The first five $$gamma$$-ray transitions of the ground-state rotational band were observed for the first time. The new data revealed that $$^{252}$$Fm possesses the lowest first excited $$2^+$$ state energy, 41.88(16) keV, and the largest kinematic moment of inertia compared to neighboring isotopes in this region. These unique properties provide strong evidence for deformed shell gaps at $$Z$$ = 100 and $$N$$ = 152, revealing that $$^{252}$$Fm is a deformed doubly magic nucleus.

論文

Direct experiments of neutron capture on stable and unstable isotopes for stellar nucleosynthesis studies

Lerendegui-Marco, J.*; Balibrea-Correa, J.*; Babiano-Suarez, V.*; Domingo-Pardo, C.*; Rovira Leveroni, G.; 他147名*

Galaxies (Internet), 14(3), p.59_1 - 59_26, 2026/07

https://doi.org/10.3390/galaxies14030059

中性子捕獲反応は、恒星における重元素の合成をモデル化するために不可欠な核物理データである。特に、恒星分光観測の精度向上やプレソーラーSiC粒子における同位体測定の進展において、全エネルギー領域にわたってより高精度な断面積データと、低速(s)過程の分岐点や中間(i)過程に関係する不安定核種が必要とされている。本論文では、直接的な中性子捕獲測定における最近の進展を概説するとともに、CERNのn_TOFにおける飛行時間(TOF)実験と、相補的な放射化法による捕獲断面積測定について報告する。これらの実験により、s過程における安定同位体およびボトルネック同位体に対して大きな進展が達成され、s過程モデルへの制約が大幅に改善した。並行して、高い瞬間中性子束と先進的な検出器システムの組み合わせにより、いくつかの不安定な分岐点核種に対する中性子捕獲断面積が初めて測定された。しかしながら、実現可能性点からは、試料入手性、バックグラウンド条件、エネルギー範囲の制約といった現状の限界も明らかになった。このような状況において、TOF法と放射化法の相補的な実験は重要な戦略となる。将来的には、高フラックス施設やイオン蓄積リングでの新しい逆運動学実験などの発展により、中性子捕獲断面積測定の限界がさらに拡張され、現状の制約が克服されるとともに、恒星核合成の理解における新たな領域が切り開かれることが期待される。

論文

Evolution of the nuclear structure in neutron-rich Cu isotopes; First spectroscopy of odd-odd $$^{74}$$Cu and $$^{76}$$Cu

Pedersen, L. G.*; Sahin, E.*; Orlandi, R.; 他64名*

European Physical Journal A, 62(6), p.114_1 - 114_18, 2026/06

https://doi.org/10.1140/epja/s10050-026-01873-w
 被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)

This study reports the first spectroscopic observation of excited states in odd-odd isotopes $$^{74}$$Cu and $$^{76}$$Cu, following Ni $$beta$$ decay. Performed at RIKEN, the experiment analyzed $$gamma$$-ray coincidences to construct level schemes for these nuclei. The findings interpret the low-lying states as spin multiplets resulting from the coupling of specific single-particle orbitals (protons and neutrons). The results provide crucial data on how single-particle orbitals evolve in neutron-rich Cu isotopes and characterize the proton-neutron interaction near $$^{78}$$Ni. Furthermore, they constitute key benchmarks for nuclear structure theory, detailing orbital evolution in neutron-rich Cu. Most significantly, the non-observation of a predicted isomer, combined with observed decays, definitively assigns the spin-parity ($$pi = 1/2^+$$ vs $$pi = 3/2^-$$), resolving long-standing ambiguities for advanced shell-model calculations.

論文

Granitic intrusions enhance strain localization and rapid mantle exhumation along an oceanic detachment fault

Poulaki, E. M.*; 安邊 啓明; 他34名*

Science Advances (Internet), 12(23), p.eaec6950_1 - eaec6950_15, 2026/06

https://doi.org/10.1126/sciadv.aec6950
 被引用回数：0 パーセンタイル：0.00(Multidisciplinary Sciences)

IODP第402次航海ではティレニア海の若い海洋底を掘削し、地殻伸長に伴うマントルの上昇過程を調査した。掘削コアは主に貫入した花崗岩と蛇紋岩化したかんらん岩から成り、花崗岩は約400万年前に深度7kmで結晶化後、約50万年で急速に海底へ上昇した。構造観察から花崗岩は変形の集中を助長し、断層の局所化を促進したと示される。さらに安定同位体分析から約200$$^{circ}$$Cでの蛇紋岩化が変形後に生じたことが判明した。これらは珪長質マグマが断層の局所化を誘発し、大陸分裂とマントル上昇を可能にすることを示す。

論文

Single-particle strength toward $$N=32$$; Spectroscopy of $$^{51}$$Ca via the $$^{50}$$Ca$$(d, p)$$ reaction

Ferrera, C.*; Wimmer, K.*; 宇都野 穣; 他48名*

Physical Review C, 113(4), p.044311_1 - 044311_10, 2026/04

https://doi.org/10.1103/3fdc-j3bf
 被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)

理化学研究所RIBFによって不安定核$$^{50}$$Caを生成し、そこからOEDOを使って低速化することによって$$(d, p)$$反応をおこし、それによって得られる励起状態を観測した。また、断面積と反応理論から、生成される状態の分光学的因子を導いた。その値を殻模型計算と比較した結果、$$1/2^-$$, $$5/2^-$$状態への大きな分光学的因子だけでなく、$$9/2^+$$状態へのフラグメントした分光学的因子もよく説明されることがわかった。

論文

Intimate relationship between spin configuration in the triplet pair and superconductivity in UTe$$_2$$

松村 拓輝*; 徳永 陽; 酒井 宏典; 神戸 振作; 木俣 基; 他14名*

Physical Review B, 113(9), p.094506_1 - 094506_12, 2026/03

https://doi.org/10.1103/xr3p-cxbt
 被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)

Spin-triplet superconductivity is an intriguing quantum coherent state with both spin and orbital degrees of freedom, which holds significant potential for future applications in quantum technology. However, how the spin of the triplet pairs responds to an external magnetic field remains poorly understood. This is mainly due to the absence of suitable spin-triplet superconductors. Here, we report results of Knight-shift and ac-susceptibility measurements on UTe$$_2$$. We demonstrate that the spin susceptibility, which slightly decreases compared to the normal-state value below the superconducting transition temperature $$T_c$$, is rapidly restored and nearly recovers to the normal-state values around 5 T, well below the SC upper critical field $$H_{c2}$$ when the magnetic field is applied along the $$c$$ axis.

論文

Observation of a new isomer in $$^{185}$$Au

Fu, X. Y.*; Liu, Z.*; Andreyev, A. N.; 他40名*

Chinese Physics C, 49(8), p.084004_1 - 084004_6, 2025/08

https://doi.org/10.1088/1674-1137/add70c
 被引用回数：1 パーセンタイル：43.93(Physics, Nuclear)

Delayed $$gamma$$-ray spectroscopy of $$^{185}$$Au was performed at Argonne. A new isomer at 1504.2(4)~keV with a 630(80)~ns half-life was identified using $$gamma$$-$$gamma$$ coincidences. It decays via a 294.8(3)~keV transition. Weisskopf estimates suggest this transition is likely E1, M1, E2, or M2. Possible configurations for this isomer are discussed using configuration-constrained potential energy surface calculations.

論文

Temperature-dependent deformation behavior of dual-phase medium-entropy alloy; In-situ neutron diffraction study

Gu, G. H.*; Jeong, S. G.*; Heo, Y.-U.*; Harjo, S.; Gong, W.; Cho, J.*; Kim, H. S.*; 他4名*

Journal of Materials Science & Technology, 223, p.308 - 324, 2025/07

https://doi.org/10.1016/j.jmst.2024.11.057
 被引用回数：9 パーセンタイル：89.01(Materials Science, Multidisciplinary)

Face-centered cubic (FCC) equi-atomic multi-principal element alloys (MPEAs) exhibit excellent mechanical properties from cryogenic to room temperatures. At room temperature, deformation is dominated by dislocation slip, while at cryogenic temperatures (CTs), reduced stacking fault energy enhances strain hardening with twinning. This study uses in-situ neutron diffraction to analyze the temperature-dependent deformation behavior of Al$$_{7}$$(CoNiV)$$_{93}$$, a dual-phase (FCC/BCC) medium-entropy alloy (MEA). At liquid nitrogen temperature (LNT), deformation twinning in the FCC matrix leads to additional strain hardening through the dynamic Hall-Petch effect, giving the appearance of improved strengthening at LNT. In contrast, BCC precipitates show dislocation slip at both 77 K and 298 K, with temperature-dependent lattice friction stress playing a significant role in strengthening. The study enhances understanding of deformation behaviors and provides insights for future alloy design.

論文

Enhancing the strength and ductility of a medium entropy alloy through non-basal slip activation

Chen, Z.*; Gong, W.; Harjo, S.; 川崎 卓郎; Chen, G.*; 他14名*

Nature Communications (Internet), 16, p.6480_1 - 6480_13, 2025/07

https://doi.org/10.1038/s41467-025-61494-7
 被引用回数：19 パーセンタイル：91.56(Multidisciplinary Sciences)

Developing alloys with both ultrahigh strength and ductility remains a for- midable scientific challenge, primarily due to the inherent strength-ductility tradeoff. Here, we present an approach to enhance the ductility and strength of a medium-entropy alloy (MEA) featuring a fully recrystallized face-centered cubic/hexagonal close-packed dual-phase ultrafine-grained architecture. This is achieved by activating unusual non-basal slips in the ordered hexagonal close-packed superlattice nanoprecipitates, resulting in this MEA that exhibits remarkable uniform elongation ($$varepsilon$$$$_{u}$$) and ultrahigh yield strength ($$sigma$$$$_{y}$$) across a wide temperature range, particularly at cryogenic temperatures ($$sigma$$$$_{y}$$ $$sim$$ 2100 MPa, $$varepsilon$$$$_{u}$$ $$sim$$ 15%). The non-basal slips in the secondary phase are activated at ultrahigh stress levels, which are compatible with the increased yield strength of the MEA attained through multiple strengthening mechanisms, including grain boundaries, lattice friction, and second-phase nanoprecipitates provided by the multi-principal elements of the entropy alloy. The deformation mechanism elucidated in this work not only leverages the significant strengthening and strain hardening effects of brittle nanoprecipitates but also enables the ductilization of the alloy through sequential non-basal slip during ongoing deformation.

論文

Investigation of the excited states of $$^{114}$$Sn using the GRIFFIN spectrometer at TRIUMF

Syeda, N. K.*; Smallcombe, J.; 他44名*

Nuclear Physics A, 1059, p.123090_1 - 123090_5, 2025/07

https://doi.org/10.1016/j.nuclphysa.2025.123090
 被引用回数：1 パーセンタイル：0.00(Physics, Nuclear)

The semi-magic $$^{110-122}$$Sn isotopes display signs of shape coexistence in their excited 0$$^{+}$$ states, which, in contrast to the spherical 0$$^{+}$$ ground states, are deformed. This paper investigates the nuclear structure of $$^{114}$$Sn using the competing $$beta$$$$^{+}$$ decay and electron capture of a radioactive beam of $$^{114}$$Sb produced at the TRIUMF-ISAC facility using the GRIFFIN spectrometer. This study will allow for an in-depth understanding of the excited 0$$^{+}$$ states in $$^{114}$$Sn, by focusing on their decay patterns. In the present experiment, transitions at 856.2-keV and 1405.0-keV, which were observed in an earlier $$beta$$$$^{+}$$ decay study but not placed in the $$^{114}$$Sn level scheme, have been assigned to the level scheme in connection to the 0$$^{+}$$ 3 level at 2156.0-keV. Properly assigning these transitions refines the level scheme and enhances our understanding of the nuclear structure in $$^{114}$$Sn.

論文

Coulomb excitation of $$^{80}$$Sr and the limits of the $$N{approx}$$ $$Z{approx}$$ 40 island of deformation

Russell, R.*; Smallcombe, J.; 他34名*

Physical Review C, 112(1), p.014309_1 - 014309_7, 2025/07

https://doi.org/10.1103/t91y-l6rf
 被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)

The region of $$N$$ $${approx}$$ $$Z$$ $${approx}$$ 40 has long been associated with strongly deformed nuclear configurations. The presence of this strong deformation was recently confirmed through lifetime measurements in $$N$$ $${approx}$$ $$Z$$ Sr and Zr nuclei. Theoretically, however, these nuclei present a challenge due to the vast valence space required to incorporate all deformation driving interactions. Recent state-of-the-art predictions indicate a near axial prolate deformation for $$N$$ = $$Z$$ and $$N$$ = $$Z$$ + 2 nuclei between $$N$$ = $$Z$$ = 36 and $$N$$ = $$Z$$ = 40. In this work, we investigate the shores of this island of deformation through a sub-barrier Coulomb excitation study of the $$N$$ = $$Z$$ + 4 nucleus, $$^{80}$$Sr. Extracting a spectroscopic quadrupole moment of $$Q_{s}$$ (2$$^{+}_{1}$$) = 0.5$$^{+0.8}_{-0.9}$$ $$e$$b, we find that $$^{80}$$Sr is inconsistent with significant axial prolate deformation with a significance of 1.5. This result, albeit with a large uncertainty, indicates that the predicted region of strong prolate deformation around $$N$$ = $$Z$$ = 40 is tightly constrained to the quartet of nuclei: $$^{76,78}$$Sr and $$^{78,80}$$Zr.

論文

Seniority structure in neutron-rich nucleus $$^{128}$$Ag; Evidence for robustness of $$N$$=82 shell closure in silver isotopes

Luo, D. W.*; Zhang, J. Z.*; Li, Z. H.*; Orlandi, R.; 他64名*

Physical Review Letters, 134(23), p.232502_1 - 232502_7, 2025/06

https://doi.org/10.1103/wq9m-trj8
 被引用回数：4 パーセンタイル：76.34(Physics, Multidisciplinary)

The first spectroscopic study of the neutron-rich $$^{128}$$Ag isotope at RIBF-RIKEN revealed a new 1.60(7) $$mu$$s seniority isomer with a proposed 16$$^{-}$$ spin-parity. Shell model calculations accurately describe its level structure, consistent with seniority schemes in nearby odd-odd nuclei. Level inversions between $$^{128}$$Ag and $$^{130}$$In's lowest states are linked to seniority-nonconserving interactions. The structure above 10$$^{-}$$ shows similarities to seniority structures in $$^{128}$$Pd and $$^{130}$$Cd, confirming the robustness of the $$N$$=82 shell closure in silver isotopes.

論文

Influence of temperature on mechanical behavior and plasticity mechanism of a precipitation-strengthened medium-entropy alloy

Qu, H.*; Gong, W.; 川崎 卓郎; Harjo, S.; Wei, D.*; 他4名*

Science China; Technological Sciences, 68(6), p.1620201_1 - 1620201_10, 2025/06

https://doi.org/10.1007/s11431-025-2920-8
 被引用回数：3 パーセンタイル：53.39(Engineering, Multidisciplinary)

Precipitation-strengthened medium-entropy alloys (MEAs) often display an excellent balance of strength and ductility. However, the influence of temperature on their mechanical properties and plastic deformation mechanism requires further exploration. This study examines the tensile behavior and plastic deformation mechanisms of the (CoCrNi)$$_{94}$$Ti$$_{3}$$Al$$_{3}$$ alloy at 298, 77, and 20 K using in-situ neutron diffraction and electron microscopy methods. Lower temperatures result in improved mechanical performance, as indicated by an increase in yield strength, ultimate tensile strength (UTS), and elongation. At lower temperatures, a larger number of dislocations and stacking faults form, enhancing the alloy's strain hardening ability. Notably, dislocations exhibit wavy morphologies at 298 K, whereas planar behavior becomes predominant at 20 and 77 K. No FCC$$rightarrow$$HCP phase transformation is detected, a behavior that contrasts with the CoCrNi MEA under deformation at 20 K. Additionally, the interaction between dislocations and L12 nanoparticles exhibited temperature dependence, suggesting the need for future investigations. This study offers valuable insights for advancing the design of high-performance alloys suitable for cryogenic applications.

論文

Fine structure in the $$alpha$$ decay of $$^{179}$$Hg and $$^{177}$$Au

$v{S}$pa$v{c}$ek, A.*; Herz$'a$$v{n}$, A.*; Sedl$'a$k, A.*; Venhart, M.*; Andreyev, A. N.; 他48名*

European Physical Journal A, 61(3), p.43_1 - 43_9, 2025/03

https://doi.org/10.1140/epja/s10050-025-01513-9
 被引用回数：1 パーセンタイル：43.93(Physics, Nuclear)

The $$alpha$$-decay fine structure of $$^{179}$$Hg and $$^{177}$$Au was studied using decay spectroscopy at JYFL, Finland. Heavy-ion fusion reactions ($$^{82}$$Kr + $$^{100}$$Ru and $$^{88}$$Kr + $$^{92}$$Mo) produced the nuclei. A new $$alpha$$-decay with E$$alpha$$ = 6156(10) keV was observed in $$^{179}$$Hg, populating an excited state in $$^{175}$$Pt. The internal conversion coefficient for the transition de-exciting this state was measured. In $$^{177}$$Au, a new $$alpha$$-decay with E$$alpha$$ = 5998(9) keV was observed, populating an excited state in $$^{173}$$Ir. Two de-excitation paths were seen from this state, and a new 215.7(13)~keV transition was observed to depopulate another excited state in $$^{173}$$Ir. The $$alpha$$-decay properties were analyzed using reduced widths and hindrance factors.

論文

Direct measurement of lattice behavior during femtosecond laser-driven shock front formation in copper

江頭 尚弥*; 松田 朋己*; 奥地 拓生*; 瀬戸 雄介*; 伊藤 佑介*; 菖蒲 敬久; 中新 信彦*; 佐野 智一*; 他4名*

Journal of Applied Physics, 137(10), p.105903_1 - 105903_8, 2025/03

https://doi.org/10.1063/5.0253150
 被引用回数：1 パーセンタイル：24.47(Physics, Applied)

Femtosecond laser-driven shock waves exhibit characteristic features that form distinctive microstructures not formed by plate impacts or nanosecond laser-driven shock waves. A key to understanding this phenomenon is understanding the lattice behavior inside the shock front, which is the boundary between the ambient and shock compression states. However, direct measurements of the lattice spacing inside a femtosecond laser-driven shock front have not yet been performed. Here, we report ${it in-situ}$ measurements of lattice spacing using X-ray free electron laser diffraction with a pulse width of $$<$$ 10 fs during the shock rise in single-crystal copper irradiated directly in air with a femtosecond laser pulse on the order of 10$$^{14}$$ W/cm$$^{2}$$ at a pulse width of 101 fs. The lattice spacing of the femtosecond laser-irradiated single-crystal Cu (002) plane starts to compress 6.3 ps after femtosecond-laser irradiation. It takes 15.7 ps for the plane to reach peak compression, at which point the compressive elastic-strain is 24.3%. Therefore, the shock front was found to form at an elastic compressive strain rate of 1.55$$times$$10$$^{10}$$ /s in this shock-driving situation. It is suggested that the initiation of plasticity under such ultrafast deformation at the most elastic compression is based on both dislocation multiplication and dislocation generation mechanisms.

論文

Evaluation of the performance of event reconstruction algorithms in the JSNS$$^2$$ experiment using a $$^{252}$$Cf calibration source

Lee, D. H.*; 百々 拓; 羽賀 勝洋; 原田 正英; 長谷川 勝一; 春日井 好己; 木下 秀孝; 増田 志歩; 明午 伸一郎; 酒井 健二; et al.

Nuclear Instruments and Methods in Physics Research A, 1072, p.170216_1 - 170216_6, 2025/03

https://doi.org/10.1016/j.nima.2025.170216
 被引用回数：2 パーセンタイル：66.26(Instruments & Instrumentation)

JSNS$$^2$$ investigates short-baseline neutrino oscillations using a 24-meter baseline and a 17-tonne Gd-loaded liquid scintillator target. Accurate event-reconstruction algorithms are crucial for analyzing experimental data. The algorithms undergo meticulous validation through calibration with a $$^{252}$$Cf source. This paper outlines the methodology and evaluates the reconstruction performance, focusing on neutrino interactions up to approximately 50 MeV for sterile neutrino searches. Both $$^{252}$$Cf and Michel electron events are studied to evaluate reconstruction accuracy. The analysis concludes that the uncertainty of the fiducial volume, with an appropriate correction, is much less than the requirement of JSNS$$^2$$ requirement (10%). Furthermore, the energy resolution is measured to be 3.3 $$pm$$ 0.1% for the Michel electron endpoint and 4.3 $$pm$$ 0.1% for the n-Gd peak in the central region.

論文

Pulse shape discrimination in JSNS$$^2$$

百々 拓; 羽賀 勝洋; 原田 正英; 長谷川 勝一; 春日井 好己; 木下 秀孝; 増田 志歩; 明午 伸一郎; 酒井 健二; 鈴谷 賢太郎; et al.

Progress of Theoretical and Experimental Physics (Internet), 2025(2), p.023H02_1 - 023H02_8, 2025/02

https://doi.org/10.1093/ptep/ptaf016
 被引用回数：2 パーセンタイル：34.76(Physics, Multidisciplinary)

JSNS$$^2$$ (J-PARC Sterile Neutrino Search a t J-PARC Spallation Neutron Source) is an experiment that is searching for sterile neutrinos via the observation of $$bar{nu}_{mu} to bar{nu}_e$$ appearance oscillations using neutrinos from muon decay-at-rest. For this search, rejecting cosmic-ray-induced neutron events by Pulse Shape Discrimination (PSD) is essential because the JSNS$$^2$$ detector is located above ground, on the third floor of the building. We have achieved 94.95$$% pm 0.15%$$ rejection of neutron events while keeping 92.82$$% pm 1.77%$$ of signal, electron-like events using a data-driven likelihood method. This article will report the PSD technique using the full fiducial volume of the JSNS$$^2$$ detector.

論文

Surface structure of the 3$$times$$3-Si phase on Al(111), studied by the multiple usages of positron diffraction and core-level photoemission spectroscopy

佐藤 祐輔*; 深谷 有喜; 他14名*

Physical Review Materials (Internet), 9(1), p.014002_1 - 014002_11, 2025/01

https://doi.org/10.1103/PhysRevMaterials.9.014002
 被引用回数：0 パーセンタイル：0.00(Materials Science, Multidisciplinary)

本研究では、陽電子回折と内殻光電子分光の複合利用により、Al(111)3$$times$$3-Si表面の構造を明らかにした。ロッキング曲線の解析では、3$$times$$3-Si相が平坦なハニカム構造から構成されること、また、第一原理計算に基づくSi内殻スペクトルの解析では、単位胞内のSi原子の一つがAl原子と置換されていることがわかった。すなわち、3$$times$$3-Si相の表面超構造はAl原子を内包したSi二次元層である。

論文

Observation of the $$J leq$$ 7/2 low-spin states in $$^{213}$$Fr populated in the electron capture of the 1/2$$^-$$ ground state of $$^{213}$$Ra

Clisu, C.*; Andreyev, A. N.; Nita, C. R.*; 他42名*

Physical Review C, 110(6), p.064315_1 - 064315_15, 2024/12

https://doi.org/10.1103/PhysRevC.110.064315
 被引用回数：2 パーセンタイル：39.43(Physics, Nuclear)

A level scheme of $$^{213}$$Fr, following the EC/$$beta^+$$ decay of its parent, was constructed at CERN's ISOLDE Decay Station. The $$beta$$ decay strength suggests direct population of low-spin ($$J$$=7/2) excited states. Analysis of $$gamma$$-single and $$gamma-gamma$$ coincidences identified new $$gamma$$-ray transitions and states up to $$sim$$3.6 MeV. Spins and parities of these levels, beyond the known (7/2$$^-$$) state, were assigned based on $$N$$=126 isotone systematics and compared to shell-model calculations. A new isomer with a half-life of 26(3)~ns was also found.

論文

Production cross-sections of residual nuclides from $$^{93}$$Zr + $$p$$ at 27 MeV/nucleon

Hwang, J.*; Chillery, T.*; 堂園 昌伯*; 今井 伸明*; 道正 新一郎*; 炭竃 聡之*; 千賀 信幸*; 大田 晋輔*; 中山 梓介; 他49名*

Progress of Theoretical and Experimental Physics (Internet), 2024(9), p.093D03_1 - 093D03_12, 2024/09

https://doi.org/10.1093/ptep/ptae139
 被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

核変換は高レベル廃棄物の再処理、特に使用済み燃料から$$^{93}$$Zrのような長寿命核種を処理するための有望な手段であると考えられている。これらの核種に対する核反応データを蓄積することは、核変換の検討や反応機構を包括的に理解するために不可欠である。本研究では、$$^{93}$$Zrに対する陽子入射反応からの残留核生成断面積を、核子当たり27MeVのエネルギーで逆運動学法を用いて測定した。理研RIBFのOEDOビームラインを用いて、$$^{91-93}$$Nb, $$^{91,92}$$Zr, $$^{88,89}$$Yの各同位体の生成断面積を導出した。励起関数について、TALYSやCCONEによる理論予測は、本研究や先行研究の実験値と概ね良い一致を示した。本研究で測定された断面積は、廃棄物処理に関する将来の検討のための貴重なデータとなる。

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