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論文

Phonon spectrum in the spin-Peierls phase of CuGeO $_{3}$

Spitz, L.*; Razpopov, A.*; Biswas, S.*; Lane, H.*; Nikitin, S. E.*; 飯田一樹*; 梶本亮一; 藤田全基*; 新井正敏*; Mourigal, M.*; et al.

Physical Review B, 112(18), p.184302_1 - 184302_18, 2025/11

https://doi.org/10.1103/jz36-8kz9

CuGeO $_{3}$ has long been studied as a prototypical example of the spin-Peierls transition in a Heisenberg chain. Despite intensive investigation of this quasi-one-dimensional material, systematic measurements and calculations of the phonon excitations in the dimerized phase have not to date been possible, leaving certain aspects of the spin-Peierls phenomenon unresolved. We perform state-of-the-art density functional theory (DFT) calculations to compute the electronic structure and phonon dynamics in the low-temperature dimerized phase. We also perform high-resolution neutron spectroscopy to measure the full phonon spectrum over multiple Brillouin zones. We find excellent agreement between our numerical and experimental results that extend to all measurement temperatures. Notable features of our phonon spectra include a number of steeply dispersive modes, nonmonotonic dispersion features, and specific phonon anticrossings, which we relate to the mode eigenvectors. By calculating the magnetic interactions within DFT and studying the effects of different phonon modes on the superexchange paths, we discuss the possibility of observing spinphonon hybridization effects in experiments performed both in and out of equilibrium.

論文

Spin dynamics of triple- magnetic orderings in a triangular lattice; Implications for multi- orderings in general two-dimensional lattices

Park, P.*; Cho, W.*; Kim, C.*; An, Y.*; 飯田一樹*; 梶本亮一; Matin, S.*; Zhang, S.-S.*; Batista, C. D.*; Park, J.-G.*

Physical Review X, 15(3), p.031032_1 - 031032_29, 2025/07

https://doi.org/10.1103/y9ly-4kld

Multi- magnetic structures on two-dimensional (2D) lattices provide a key route to realizing topological physics in 2D magnetism. A major experimental challenge is to unambiguously confirm their formation by excluding the possibility of topologically trivial multi-domain single- or double- magnetic orders, which cannot be distinguished using conventional diffraction techniques. Here, we propose that long-wavelength spin dynamics offers a universal diagnostic for triangular lattices: triple- orders that preserve rotational symmetry and single- or double- orders that break it exhibit qualitatively distinct anisotropies in their Goldstone mode velocities, stemming from fundamental differences in their underlying spin configurations. We validate this concept using the metallic triangular-lattice antiferromagnet Co $_{0.325}$ TaS $_{2}$ , which hosts both a stripe-type single- state and a triple- tetrahedral ordering at different temperatures. Using inelastic neutron-scattering and spin dynamics simulations, we first refine the spin Hamiltonian by fitting the paramagnetic excitation spectra, allowing us to develop an unbiased model independent of magnetic ordering. We then show that the observed velocity profiles of the Goldstone modes agree with the high-temperature model's predictions: markedly anisotropic for the single- phase and near isotropic for the triple- phase. Importantly, this contrast persists across various exchange parameters, highlighting its model-independent nature and suggesting potential applicability to other 2D lattice systems. Beyond the long-wavelength regime, we present a substantial discrepancy between the measured and simulated magnon spectra exclusively in the triple- phase. We attribute this discrepancy to magnon energy renormalization arising from order-of-magnitude-enhanced magnon-magnon interactions in the triple- phase, due to its noncollinear configuration. This work provides universal insight into the dynamical properties of topological multi- magnetic orderings in 2D lattice structures, offering a broadly applicable diagnostic to distinguishing them from topologically trivial single- or double- counterparts. The unequivocal confirmation of the triple- structure in Co $_{0.325}$ TaS $_{2}$ further establishes it as a prominent material platform for exploring topological spin textures in the genuine 2D limit.

論文

Magnetic excitation in the hyperkagome antiferromagnet Mn $_{3}$ RhSi

社本真一; 山内宏樹; 飯田一樹*; 池内和彦*; 金子耕士; Chen, Y.-S.*; 矢野真一郎*; Hsu, P.-T.*; Lee, M. K.*; Hall, A. E.*; et al.

Physical Review Research (Internet), 6(3), p.033303_1 - 033303_7, 2024/09

https://doi.org/10.1103/PhysRevResearch.6.033303

Mn $_{3}$ RhSiの磁気励起は少なくとも0.3から140meVに広がる。200Kでの非弾性散乱強度を積分することで、Mnサイト当たり約5 $mu_{B}$ の磁気モーメントは、約5 $mu_{B}$ であることがわかった。一方で、長距離磁気秩序の磁気モーメントは4Kでわずか2.61 $mu_{B}$ であり、多くの部分が低温まで揺らいでいることがわかった。

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：8 パーセンタイル：87.36(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- 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 , 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 axis. However, samples with 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 develops coplanar helical magnetic order with $mathbf{q}_mathrm{m1} =(1/3, 0, 0)$ . This is entirely different from what has been seen in , explaining the observed composition dependence.

論文

Quantum critical behavior of the hyperkagome magnet MnCoSi

山内宏樹; Sari, D. P.*; 安井幸夫*; 坂倉輝俊*; 木村宏之*; 中尾朗子*; 大原高志; 本田孝志*; 樹神克明; 井川直樹; et al.

Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02

https://doi.org/10.1103/PhysRevResearch.6.013144

-Mn-type family alloys Mn have three-dimensional antiferromagnetic (AFM) corner-shared triangular network. The antiferromagnet MnRhSi shows magnetic short-range order (SRO) over a wide temperature range of approximately 500 K above the Nel temperature $T_{rm N}$ = 190 K. MnCoSi has the smallest lattice parameter and the lowest $T_{rm N}$ in the family compounds. The quantum critical point (QCP) from AFM to the quantum paramagnetic state is expected near a cubic lattice parameter of 6.15 of MnCoSi is only 140 K, quantum critical behavior is observed in MnCoSi as the enhancement of the electronic specific heat coefficient . We study how the magnetic SRO appears in MnCoSi by using neutron scattering, SR, and physical property measurements. The experimental results show that the neutron scattering intensity of the magnetic SRO does not change much regardless of the suppressed magnetic moment in the long-range magnetic ordered state compared to those of MnRhSi. The initial asymmetry drop ratio of SR above $T_{rm N}$ becomes small, and the magnetic SRO temperature $T_{SRO}$ is suppressed to 240 K. The results suggest that the MnCoSi is close to the QCP in the Mn system.

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：28 パーセンタイル：90.63(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- 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- 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- state.

論文

Spiral spin cluster in the hyperkagome antiferromagnet Mn $_{3}$ RhSi

社本真一; 山内宏樹; 飯田一樹*; 池内和彦*; Hall, A. E.*; Chen, Y.-S.*; Lee, M. K.*; Balakrishnan, G.*; Chang, L.-J.*

Communications Physics (Internet), 6, p.248_1 - 248_6, 2023/09

https://doi.org/10.1038/s42005-023-01363-1

被引用回数：3 パーセンタイル：41.81(Physics, Multidisciplinary)

Mn $_{3}$ RhSi単結晶の中性子散乱測定により、局所スピン相関秩序がらせん構造を持つことがわかった。磁気クラスター形成の起源の可能性を、リフシッツ不変量とグリフィス相の観点から議論し、Co $_{7}$ Zn $_{7}$ Mn $_{6}$ の室温スキルミオン相とMnの非フェルミ液体挙動と比較した。

論文

Magnon mode transition in real space

飯田一樹*; 樹神克明; 稲村泰弘; 中村充孝; Chang, L.-J.*; 社本真一

Scientific Reports (Internet), 12, p.20663_1 - 20663_7, 2022/12

https://doi.org/10.1038/s41598-022-22555-9

被引用回数：2 パーセンタイル：24.16(Multidisciplinary Sciences)

イルメナイトFeTiO $_{3}$ 粉末サンプルのスピン励起を、飛行時間非弾性中性子散乱によって測定し、動的磁気ペア密度関数 $D_{M}(r,E)$ を、動的磁気構造因子 $S_{M}(Q,E)$ からフーリエ変換によって初めて得ることに成功した。

論文

Possible future upgrades of the direct-geometry chopper spectrometer 4SEASONS

梶本亮一; 中村充孝; 蒲沢和也*; 稲村泰弘; 飯田一樹*; 池内和彦*; 石角元志*

EPJ Web of Conferences, 272, p.02007_1 - 02007_8, 2022/11

https://doi.org/10.1051/epjconf/202227202007

4SEASONS is a direct geometry time-of-flight spectrometer installed in the Materials and Life Science Experimental Facility, the Japan Proton Accelerator Research Complex. It is used to study atomic andspin dynamics in the energy range of meV to meV. Since more than a decade has crossed after the first inelastic scattering experiment, it is essential to consider upgrading the instrument to improve its flexibility and performance. In this paper, we discuss the possible medium-term upgrades of key components of the instrument like the chopper system, which are achievable with the current technology and at reasonable cost. Herein, we demonstrated that 4SEASONS can improve the energy resolution by a factor of two, remove frame overlap of adjacent incident energies, significantly improve the asymmetry in the pulse shape, and increase the flux by a factor of 1.5, without major technical difficulties.

論文

Hydrogen vibration excitations of ZrH $_{1.8}$ and TiH $_{1.84}$ up to 21 GPa by incoherent inelastic neutron scattering

服部高典; 中村充孝; 飯田一樹*; 町田晃彦*; 佐野亜沙美; 町田真一*; 有馬寛*; 大下英敏*; 本田孝志*; 池田一貴*; et al.

Physical Review B, 106(13), p.134309_1 - 134309_9, 2022/10

https://doi.org/10.1103/PhysRevB.106.134309

被引用回数：1 パーセンタイル：12.28(Materials Science, Multidisciplinary)

量子調和振動子(QHO)で近似できる蛍石型のZrH $_{1.8}$ とTiH $_{1.84}$ の水素の振動励起を非弾性非干渉性中性子散乱によって21GPaおよび4GPaまで調べた。第一励起の振動エネルギーはそれぞれ(meV) = 141.4(2) + 1.02(2)(GPa)および(meV) = 149.4(1) + 1.21(8)(GPa)で表され、圧力とともに上昇した。格子定数の圧力変化と組み合わせて得られた金属水素原子間距離( $d_{M-H}$ )との関係は、(meV) = 1.62(9) 10 $d_{M-H}^{-3.31(8)}$ (および(meV) = 1.47(21) 10 $d_{M-H}^{-3.5(2)}$ (であった。これらのカーブの傾きは、様々な蛍石型の金属水素化物の常圧下のトレンドに比べ、急峻であった。から得られた水素波動関数の広がりは、格子間サイトよりも縮み易いことが分かった。高圧下における水素の波動関数の優先的な収縮や小さな $d_{M-H}$ におけるの急峻な立ち上がりは金属原子のイオンコアが水素原子よりも堅いために水素原子が高圧下でより狭い領域に閉じ込められるために起こると考えられる。

論文

Evidence for strong correlations at finite temperatures in the dimerized magnet Na $_{2}$ Cu $_{2}$ TeO $_{6}$

Shangguan, Y.*; Bao, S.*; Dong, Z.-Y.*; Cai, Z.*; Wang, W.*; Huang, Z.*; Ma, Z.*; Liao, J.*; Zhao, X.*; 梶本亮一; et al.

Physical Review B, 104(22), p.224430_1 - 224430_8, 2021/12

https://doi.org/10.1103/PhysRevB.104.224430

被引用回数：2 パーセンタイル：8.81(Materials Science, Multidisciplinary)

Dimerized magnets forming alternating Heisenberg chains exhibit quantum coherence and entanglement and thus can find potential applications in quantum information and computation. However, magnetic systems typically undergo thermal decoherence at finite temperatures. Here, we show inelastic neutron scattering results on an alternating antiferromagnetic-ferromagnetic chain compound Na $_{2}$ Cu $_{2}$ TeO $_{6}$ that the excited quasiparticles can counter thermal decoherence and maintain strong correlations at elevated temperatures. At low temperatures, we observe clear dispersive singlet-triplet excitations arising from the dimers formed along the crystalline -axis. The excitation gap is of 18 meV and the bandwidth is about half of the gap. The band top energy has a weak modulation along the [100] direction, indicative of a small interchain coupling. The gap increases while the bandwidth decreases with increasing temperature, leading to a strong reduction in the available phase space for the triplons. As a result, the Lorentzian-type energy broadening becomes highly asymmetric as the temperature is raised. These results are associated with a strongly correlated state resulting from hard-core constraint and quasiparticle interactions. We consider these results to be not only evidence for strong correlations at finite temperatures in Na $_{2}$ Cu $_{2}$ TeO $_{6}$ , but also for the universality of the strongly correlated state in a broad range of quantum magnetic systems.

論文

Detection of hydroxyl and hydride functional groups in a ceria crystal under hydrogen reduction

松川健*; 飯田一樹*; 中村充孝; 石垣徹*

CrystEngComm (Internet), 23(12), p.2355 - 2359, 2021/03

https://doi.org/10.1039/d1ce00130b

被引用回数：4 パーセンタイル：39.27(Chemistry, Multidisciplinary)

Neutron powder diffraction analysis revealed that ceria transformed into the oxyhydroxide structure by hydrogen treatment. Due to detection of the vibrational modes of both OH and CeH functional groups by inelastic neutron scattering measurements, the CeH functional group was revealed to possibly exist in ceria as an aperiodic structure.

論文

Energy resolution and neutron flux of the 4SEASONS spectrometer revisited

梶本亮一; 中村充孝; 飯田一樹*; 蒲沢和也*; 池内和彦*; 稲村泰弘; 石角元志*

Journal of Neutron Research, 22(2-3), p.99 - 107, 2020/10

https://doi.org/10.3233/JNR-200146

The elastic energy resolution, integrated intensity, and peak intensity of the direct-geometry neutron chopper spectrometer 4SEASONS at Japan Proton Accelerator Research Complex (J-PARC) were re-investigated. This was done with respect to the incident energy and the rotation speed of the Fermi chopper using incoherent scattering of vanadium and simple analytical formulas. The model calculations reproduced the observed values satisfactorily. The present work should be useful for estimating in instrument performance in experiments.

論文

=0 long-range magnetic order in centennialite CaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ O; A Spin- $frac{1}{2}$ perfect kagome antiferromagnet with $J_{1}$ - $J_{2}$ - $J_{d}$

飯田一樹*; 吉田紘行*; 中尾朗子*; Jeschke, H. O.*; Iqbal, Y.*; 中島健次; 河村聖子; 宗像孝司*; 稲村泰弘; 村井直樹; et al.

Physical Review B, 101(22), p.220408_1 - 220408_6, 2020/06

https://doi.org/10.1103/PhysRevB.101.220408

被引用回数：29 パーセンタイル：78.16(Materials Science, Multidisciplinary)

鉱物センテニアライトCaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ Oの結晶構造と磁気構造をシンクロトロンX線回折と中性子回折測定に密度汎関数理論(DFT)と疑似フェルミオン汎関数繰り込み群(PFFRG)の計算を組み合わせることで調べた。CaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ OではCu $^{2+}$ イオンは反強磁性 $J_{1}$ と幾何学的に完全なカゴメネットワークを形成する。Cu $^{2+}$ とCa $^{2+}$ イオン間のサイト間無秩序は見つからなかった。CaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ Oは $_{rm N}$ =7.2K以下で磁気秩序を示し、負のベクトルスピンキラリティーを持つ=0の磁気構造が現れる。0.3Kでの秩序モーメントは0.58(2)Bに抑えられている。我々のDFT計算では、この系が量子臨界点の近くにあり、 $J_{1}$ - $J_{2}$ - $J_{d}$ カゴメ反強磁性体の優れた実現であることを示唆している。

論文

Horizontal line nodes in SrRuO proved by spin resonance

飯田一樹*; 古府麻衣子; 鈴木雄大*; 村井直樹; 河村聖子; 梶本亮一; 稲村泰弘; 石角元志*; 長谷川舜介*; 益田隆嗣*; et al.

Journal of the Physical Society of Japan, 89(5), p.053702_1 - 053702_5, 2020/05

https://doi.org/10.7566/JPSJ.89.053702

被引用回数：23 パーセンタイル：76.34(Physics, Multidisciplinary)

We investigated the low-energy incommensurate (IC) magnetic fluctuations in SrRuO by the high-resolution inelastic neutron scattering measurements and random phase approximation (RPA) calculations. We observed a spin resonance with energy of $hbar omega_{rm res}0.56$ meV centered at a characteristic wavevector $Q_{rm res}=(0.3,0.3,0.5)$ . The resonance energy corresponds well to the superconducting gap 2 = 0.56 meV estimated by the tunneling spectroscopy. The spin resonance shows the modulation with a maximum at around . The modulated intensity of the spin resonance and our RPA calculations indicate that the superconducting gaps regarding the quasi-one-dimensional and sheets at the Fermi surfaces have the horizontal line nodes. These results may set a strong constraint on the pairing symmetry of SrRuO. We also discuss the implications on possible superconducting order parameters.

論文

Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe $_{4}$ As $_{4}$

飯田一樹*; 永井佑紀; 石田茂之*; 石角元志*; 村井直樹; Christianson, A. D.*; 吉田紘行*; 稲村泰弘; 中村博樹; 中尾朗子*; et al.

Physical Review B, 100(1), p.014506_1 - 014506_8, 2019/07

https://doi.org/10.1103/PhysRevB.100.014506

被引用回数：39 パーセンタイル：81.92(Materials Science, Multidisciplinary)

パルス中性子散乱実験による鉄系超伝導体EuRbFe $_{4}$ As $_{4}$ のスピン揺らぎ、磁気構造の測定を行い、同物質における超伝導体対称性などの議論を行った。

論文

Study on use of superconducting magnet and first inelastic neutron scattering experiment under magnetic field at 4SEASONS spectrometer

梶本亮一; 石角元志*; 吉良弘*; 金子耕士; 中村充孝; 蒲沢和也*; 稲村泰弘; 池内和彦*; 飯田一樹*; 村井直樹; et al.

Physica B; Condensed Matter, 556, p.26 - 30, 2019/03

BB2018-0570.pdf:2.17MB

https://doi.org/10.1016/j.physb.2018.11.065

被引用回数：3 パーセンタイル：12.30(Physics, Condensed Matter)

Magnets are important for studying magnetism and are commonly used as sample environment devices of neutron scattering instruments. However, the use of magnets was prevented at the time-of-flight direct-geometry neutron spectrometer 4SEASONS in Materials and Life Science Experimental Facility (MLF) at J-PARC, because the instrument is surrounded by iron components, and it is equipped with a piece of equipment operated with magnetic bearings. In the present work, we investigate the influence of stray magnetic fields from a superconducting magnet which is shared among neutron scattering instruments in MLF. Based on the investigation, we modified 4SEASONS such that it can be used with the magnet. Finally, we successfully performed the first inelastic neutron scattering experiments with applied magnetic fields using this sample environment.

論文

Quantum magnetisms in uniform triangular lattices Li $_{2}$ Mo $_{3}$ O $_{8}$ ( = In, Sc)

飯田一樹*; 吉田紘行*; 岡部博孝*; 片山尚幸*; 石井裕人*; 幸田章宏*; 稲村泰弘; 村井直樹; 石角元志*; 門野良典*; et al.

Scientific Reports (Internet), 9(1), p.1826_1 - 1826_9, 2019/02

https://doi.org/10.1038/s41598-018-36123-7

被引用回数：14 パーセンタイル：64.11(Multidisciplinary Sciences)

Molecular based spin-1/2 triangular lattice systems have attracted research interest. LiMoO ( = In or Sc) is such a compound where spin-1/2 MoO $_{13}$ clusters in place of Mo ions form the uniform triangular lattice. Here, we report exotic magnetisms in LiInMoO and LiScMoO investigated by muon spin rotation (SR) and inelastic neutron scattering (INS) spectroscopies. LiInMoO exhibits spin wave excitation which is quantitatively described by the nearest neighbor anisotropic Heisenberg model based on the 120 $^{circ}$ spin structure. In contrast, LiScMoO undergoes short-range magnetic order below 4 K with quantum-spin-liquid-like magnetic fluctuations down to the base temperature. Origin of the different ground states is discussed in terms of anisotropies of crystal structures and magnetic interactions.

論文

Performances of oscillating radial collimator for the Fermi chopper spectrometer 4SEASONS at J-PARC

中村充孝; 神原理*; 飯田一樹*; 梶本亮一; 蒲沢和也*; 池内和彦*; 石角元志*; 青山和弘*

Physica B; Condensed Matter, 551, p.480 - 483, 2018/12

BB2017-0466.pdf:0.78MB

https://doi.org/10.1016/j.physb.2018.05.028

被引用回数：8 パーセンタイル：35.62(Physics, Condensed Matter)

近年、磁場や圧力、高温といった特殊環境下での中性子非弾性散乱実験へのニーズが高まっており、質の高いデータを得るためには試料環境機器からの不要な散乱をできる限り低く抑える必要がある。そこで、我々はユーザーのニーズに応えるため、J-PARCのフェルミチョッパー分光器四季に特化した揺動型ラジアルコリメータを開発した。四季では比較的高い入射エネルギーを用いることから、コリメータのブレード素材に水素フリーの金属シートを採用した。このラジアルコリメータの制御システムでは、揺動スピードや揺動角等といった揺動パターンを柔軟に変更することが可能である。本稿では、新たに開発したラジアルコリメータの性能と残された課題について報告する。

論文

Status report of the chopper spectrometer 4SEASONS

梶本亮一; 中村充孝; 稲村泰弘; 蒲沢和也*; 池内和彦*; 飯田一樹*; 石角元志*; 村井直樹; 吉良弘*; 中谷健; et al.

Journal of Physics; Conference Series, 1021(1), p.012030_1 - 012030_6, 2018/06

BB2016-1727.pdf:0.39MB

https://doi.org/10.1088/1742-6596/1021/1/012030

被引用回数：3 パーセンタイル：83.99(Nuclear Science & Technology)

4SEASONS is a medium-resolution thermal neutron chopper spectrometer in the Materials and Life Science Experimental Facility (MLF) at J-PARC. Although 4SEASONS is routinely used for many experiments by internal and external users, upgrading and maintenance work is still underway. This paper reviews the recent improvements of the instrument.