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論文

FENDL: A Library for fusion research and applications

Schnabel, G.*; 国枝賢; 今野力; 中山梓介; 他27名*

Nuclear Data Sheets, 193, p.1 - 78, 2024/02

https://doi.org/10.1016/j.nds.2024.01.001

国際原子力機関(IAEA)が中心となり、各国の研究者の協力のもと、核融合研究開発のための国際核データライブラリFENDLの更新を行った。最新ライブラリ(FENDL-3.2b)の構築にあたっては、主に米国のENDF、欧州のJEFF、日本のJENDLの相互比較を行い、積分検証結果も踏まえつつ、現状で最も妥当と考えられるデータを個々の核種毎に採用した。従来のライブラリとの大きな違いは、加速器中性子源やそれを用いる材料研究分野からのニーズに応えるためにこれまでのエネルギー上限を20MeVから最大200MeVに拡張し、中性子データのみならず陽子や重陽子データの収録も新規に行なったことである。また、本ライブラリの品質を検証することを目的として、中性子輸送計算や核発熱シミュレーション等を通じた種々のベンチーマーク解析を実施した。それにより、従来のライブラリに比べ実用性が大きく向上していることを示した。

論文

X-ray free electron laser observation of ultrafast lattice behaviour under femtosecond laser-driven shock compression in iron

佐野智一*; 松田智己*; 廣瀬明夫*; 寺井智之*; 掛下智之*; 犬伏雄一*; 佐藤孝弘*; 矢橋牧名*; 菖蒲敬久; 他22名*

Scientific Reports (Internet), 13, p.13796_1 - 13796_10, 2023/08

https://doi.org/10.1038/s41598-023-40283-6

被引用回数：0 パーセンタイル：0(Multidisciplinary Sciences)

Over the past century, understanding the nature of shock compression of condensed matter has been a major topic. About 20 years ago, a femtosecond laser emerged as a new shock-driver. Unlike conventional shock waves, a femtosecond laser driven shock wave creates unique microstructures in materials. Therefore, the properties of this shock wave may be different from those of conventional shock waves. However, the lattice behaviour under femtosecond laser-driven shock compression has never been elucidated. Here we report the ultrafast lattice behaviour in iron shocked by direct irradiation of a femtosecond laser pulse, diagnosed using X-ray free electron laser diffraction. We found that the initial compression state caused by the femtosecond laser driven shock wave is the same as that caused by conventional shock waves. We also found, for the first time experimentally, the temporal deviation of peaks of stress and strain waves predicted theoretically. Furthermore, the existence of a plastic wave peak between the stress and strain wave peaks is a new finding that has not been predicted even theoretically. Our findings will open up new avenues for designing novel materials that combine strength and toughness in a trade-off relationship.

論文

First measurement of differential cross sections and photon beam asymmetries for photoproduction of the (980) meson decaying into at 2.4 GeV

村松憲仁*; 土川雄介; LEPS2 BGOegg Collaboration*; 他61名*

Physical Review C, 107(4), p.L042201_1 - L042201_5, 2023/04

https://doi.org/10.1103/PhysRevC.107.L042201

被引用回数：0 パーセンタイル：0.02(Physics, Nuclear)

For the first time, differential cross sections and photon beam asymmetries were measured for the reaction by using a linearly polarized photon beam up to 2.4 GeV and a liquid hydrogen target. The (980) photoproduction signal was clearly observed owing to the absence of contributions from vector-meson photoproduction. The results indicate the -channel exchange of vector mesons as a mechanism of the (980) photoproduction at approximate to 2.1 GeV, putting constraints on the nature of (980).

論文

Formation and evolution of carbonaceous asteroid Ryugu; Direct evidence from returned samples

中村智樹*; 大澤崇人; 他219名*

Science, 379(6634), p.eabn8671_1 - eabn8671_14, 2023/02

https://doi.org/10.1126/science.abn8671

被引用回数：98 パーセンタイル：99.99(Multidisciplinary Sciences)

1から8mmのリュウグウ粒子16個の鉱物学的,岩石学的、および物理的特性は、それらがCIコンドライトに最も類似していることを示している。磁硫鉄鉱中のCO $_{2}$ 含有水の存在は、母天体が太陽系星雲のH $_{2}$ OおよびCO $_{2}$ のスノーラインを越えた領域で形成したことを示しており、ここでは、リュウグウの鉱物学に基づくと、小さなコンドリュールやCa, Alを含む非常に限られた量の高温物質がある。流体-岩石反応は、低温,高pH、および水/岩石の質量比が1未満の還元条件で発生し、リュウグウのサンプルで最も変化の少ない断片として残っているかんらん石-輝石に富む岩相を、リュウグウサンプルの主要な岩相であるフィロケイ酸塩-炭酸塩に富むものに変えた。リュウグウの母体の流体から磁鉄鉱が結晶化したとき、原始太陽系星雲はまだ存在していた可能性がある。

論文

atomic X-ray spectroscopy using a counter-emulsion hybrid method

藤田真奈美; 長谷川勝一; 細見健二; 市川真也; 市川裕大; Kim, S.; 七村拓野; 佐甲博之; 田村裕和; 山本剛史; et al.

Progress of Theoretical and Experimental Physics (Internet), 2022(12), p.123D01_1 - 123D01_17, 2022/12

https://doi.org/10.1093/ptep/ptac156

被引用回数：0 パーセンタイル：0.01(Physics, Multidisciplinary)

atomic X-ray spectroscopy is one of the most useful methods for investigation of the -nucleus strong interaction. Since the X-ray energy is shifted and/or broadened due to the -nucleus strong interaction compared to those calculated from electromagnetic interaction alone, the measurement of the energy shift, E, and the width, , give us information on the -nucleus potential. A serious problem in the measurement is the significant background derived from in-flight decay. A novel method of identifying stopped events using the nuclear emulsion was developed to realize the first atomic X-ray spectroscopy experiment as the J-PARC E07 experiment, which also aimed at searching for and hypernuclei in the emulsion. The X-rays emitted from Br and Ag atoms were measured using germanium detectors. No clear peaks were observed in the obtained spectra. However, we succeeded in reducing the background to 1/170 by this method employing coincidence measurements using nuclear emulsion and X-ray detectors.

論文

-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich $^{94,95,96}$ Kr

Gerst, R.-B.*; Blazhev, A.*; Moschner, K.*; Doornenbal, P.*; Obertelli, A.*; Orlandi, R.; 他62名*

Physical Review C, 105(2), p.024302_1 - 024302_11, 2022/02

https://doi.org/10.1103/PhysRevC.105.024302

被引用回数：6 パーセンタイル：82.52(Physics, Nuclear)

The neutron rich krypton isotopes $^{94,95,96}$ Kr (=36, =58,59,60 respectively) were investigated at the Radioactive Isotope Beam Facility Facility (RIBF) at RIKEN. The nuclei of interest were produced in nuclear reactions induced by radioactive Kr and Rb beams, prduced via in-flight fission of $^{238}$ U, impinging onto the liquid hydrogen target MINOS. The main reactions occurring were (p,pn), (p,p') and (p,2p). The isotopes of interest were separated in the fragment separator BigRIPS, and their rays detected using the DALI2 -ray spectrometer. The $^{94,95,96}$ Kr provide insights onto the sudden onset of deformation occurring in Zr and Mo isotopes at =60, which is also associated with shape coexistence. In this experiment the level scheme of these isotopes could be extended, and new yrast and non-yrast states were identified. The results were compared with predictions of the "beyond-mean-field" model and the IBM model, and indications of prolate-oblate shape coexistence at =60 in the Kr isotopes was found.

論文

Absence of midgap states due to excess electrons donated by adsorbed hydrogen on the anatase TiO $_{2}$ (101) surface

長塚直樹*; 福谷克之; 他2名*

Physical Review B, 105(4), p.045424_1 - 045424_6, 2022/01

https://doi.org/10.1103/PhysRevB.105.045424

被引用回数：3 パーセンタイル：48.5(Materials Science, Multidisciplinary)

Hydrogen is involved in various important chemical processes on metal-oxide surfaces. Due to its electron-donating character, hydrogen tends to form polaronic states, where the electron is spatially separated from the proton, which exerts significant impact on the electronic properties of metal-oxide surfaces. By individually probing the proton with nuclear reaction analysis and the electron with ultraviolet photoelectron spectroscopy and in combination with density functional theory calculations, we clarify the electronic state of hydrogen on the anatase TiO $_{2}$ (101) surface. Hydrogen is found to adsorb with a saturation coverage of 0.480.12 monolayers, donating an excess electron to the substrate without forming a midgap state, which is in contrast to the behavior of oxygen vacancies.

論文

Measurements of moments of inclusive $B rightarrow X_c ell^+ nu_{ell}$ decays with hadronic tagging

van Tonder, R.*; 谷田聖; Belle Collaboration*; 他202名*

Physical Review D, 104(11), p.112011_1 - 112011_32, 2021/12

https://doi.org/10.1103/PhysRevD.104.112011

被引用回数：10 パーセンタイル：65.5(Astronomy & Astrophysics)

We present the measurement of the first to fourth order moments of the four-momentum transfer squared, , of inclusive $B rightarrow X_c ell^+ nu_{ell}$ decays using the full Belle data set of 711 $mathrm{fb}^{-1}$ of integrated luminosity at the resonance where . The determination of these moments and their systematic uncertainties open new pathways to determine the absolute value of the CKM matrix element $V_{cb}$ using a reduced set of matrix elements of the heavy quark expansion. In order to identify and reconstruct the system, we reconstruct one of the two -mesons using machine learning techniques in fully hadronic decay modes. The moments are measured with progressively increasing threshold selections on starting with a lower value of 3.0 $mathrm{GeV}^2$ in steps of 0.5 $mathrm{GeV}^2$ up to a value of 10.0 $mathrm{GeV}^2$ . The measured moments are further unfolded, correcting for reconstruction and selection effects as well as QED final state radiation. We report the moments separately for electron and muon final states and observe no lepton flavor universality violating effects.

論文

First study on Nihonium (Nh, Element 113) chemistry at TASCA

Yakushev, A.*; Lens, L.*; Dllmann, C. E.*; Block, M.*; 永目諭一郎*; 佐藤哲也; 豊嶋厚史*; 他42名*

Frontiers in Chemistry (Internet), 9, p.753738_1 - 753738_9, 2021/11

https://doi.org/10.3389/fchem.2021.753738

被引用回数：10 パーセンタイル：63.67(Chemistry, Multidisciplinary)

ニホニウム(Nh, 元素113)とフレロビウム(Fl, 元素114)は、7p軌道が占有されている最初の超重元素である。7p $_{1/2}$ 軌道と7p $_{3/2}$ 軌道の間の大きなスピン軌道分裂に由来する、相対論効果による7p $_{1/2}$ 軌道の安定化によって、Flの高い揮発性と化学的不活性が予測された。Nhのもつ7p $_{1/2}$ の不対電子は、より高い化学反応性をもたらすと予想される。気相でのNh化学研究のための最初の実験的試みの結果とともに、Nhの化学反応性の理論的予測について説明する。実験結果から、Flと比較してNh原子の化学反応性が高いことがわかった。非常に反応性の高いFr同位体を用いて、新規に開発した検出器miniCOMPACTのテストを行ったところ、Nhの化学研究が可能であることを確認できた。

論文

New -decaying state in $^{214}$ Bi

Andel, B.*; Van Duppen, P.*; Andreyev, A. N.; Blazhev, A.*; Grawe, H.*; Lica, R.*; Nadja, H.*; Stryjczyk, M.*; 他52名*

Physical Review C, 104(5), p.054301_1 - 054301_13, 2021/11

https://doi.org/10.1103/PhysRevC.104.054301

被引用回数：1 パーセンタイル：18.91(Physics, Nuclear)

A new -decaying state in $^{214}$ Bi has been identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. A preferred $I^{pi} = (8^{-})$ assignment was suggested for this state based on the -decay feeding pattern to levels in $^{214}$ Po and shell-model calculations. The half-life of the $I^{pi} = (8^{-})$ state was deduced to be $T_{1/2} = 9.39 (10)$ min. The deexcitation of the levels populated in $^{214}$ Po by the decay of this state was investigated via coincidences and a number of new levels and transitions were identified. Shell-model calculations for excited states in $^{214}$ Bi and $^{214}$ Po were performed using two different effective interactions: the H208 and the modified Kuo-Herling particle interaction. Both calculations agree on the interpretation of the new -decaying state as an $I^{pi} = 8^{-}$ isomer and allow for the tentative assignment of shell-model states to several high-spin states in $^{214}$ Po.

論文

Search for $B^{0} to tau^pm ell^mp$ () with a hadronic tagging method at Belle

Atmacan, H.*; 谷田聖; Belle Collaboration*; 他219名*

Physical Review D, 104(9), p.L091105_1 - L091105_9, 2021/11

https://doi.org/10.1103/PhysRevD.104.L091105

被引用回数：3 パーセンタイル：20.63(Astronomy & Astrophysics)

We present a search for the lepton-flavor-violating decays $B^{0} to tau^pm ell^mp$ , where , using the full data sample of pairs recorded by the Belle detector at the KEKB asymmetric-energy collider. We use events in which one meson is fully reconstructed in a hadronic decay mode. The lepton is reconstructed indirectly using the momentum of the reconstructed and that of the from the signal decay. We find no evidence for $B^{0} to tau^pm ell^mp$ decays and set upper limits on their branching fractions at 90% confidence level of ( $B^{0} to tau^pm mu^{mp}$ ) $< 1.5 times 10^{-5}$ and ( $B^{0} to tau^pm e^{mp}$ ) $< 1.6 times 10^{-5}$ .

論文

Perspectives on multiscale modelling and experiments to accelerate materials development for fusion

Gilbert, M. R.*; 荒河一渡*; 鈴土知明; 都留智仁; 他26名*

Journal of Nuclear Materials, 554, p.153113_1 - 153113_31, 2021/10

https://doi.org/10.1016/j.jnucmat.2021.153113

被引用回数：33 パーセンタイル：90.46(Materials Science, Multidisciplinary)

核融合炉環境における材料性能の予測において、計算科学モデリングが重要な役割を果たしており、第一世代の核融合発電所が稼働し長期的な挙動の観察が可能になるまで継続することが予定されている。2019年に、主要な専門家のグループがIEAの傘下の会合に参加し、核融合材料のモデル化における現在の位置と進行中の課題、および高度な実験特性評価がモデルの改善にどのように役立つかについて議論した。本論文は、そのワークショップ中に行われた議論から得られたレビューとして報告するものである。照射誘発欠陥の生成と基本特性のモデリング、ガスの挙動、クラスタリング、欠陥成長と相互作用、新しいマルチスケールシミュレーション、および高度な実験によるモデリングと実験の連携に関する取り組みについて議論した。

論文

Transition probabilities in $^{31}$ P and $^{31}$ S; A Test for isospin symmetry

Tonev, D.*; De Angelis, G.*; Deloncle, I.*; Orlandi, R.; 他27名*

Physics Letters B, 821, p.136603_1 - 136603_6, 2021/10

https://doi.org/10.1016/j.physletb.2021.136603

被引用回数：5 パーセンタイル：65.12(Astronomy & Astrophysics)

The mirror nuclei $^{31}$ P and $^{31}$ S, produced via the $^{20}$ Ne+ $^{12}$ C reaction at 33 MeV, were studied at Legnaro Laboratory using the EUCLIDES Si array coupled with the GASP Ge array. The observed B(E1) strengths of mirror E1 transitions, provide strong evidence for breaking of isospin symmetry in the A=31 mass region. The new finding are supported and explained by state-of-the-art beyond-mean-field calculations including 2- and 3-body forces. According to these findings, the breaking of isospin symmetry originate from violation of charge symmetry in the 2- and 3-body parts of the Coulomb potential.

論文

Measurement of the masses and widths of the and baryons

Yelton, J.*; 谷田聖; Belle Collaboration*; 他205名*

Physical Review D, 104(5), p.052003_1 - 052003_8, 2021/09

https://doi.org/10.1103/PhysRevD.104.052003

被引用回数：4 パーセンタイル：37.94(Astronomy & Astrophysics)

Using 980 ${rm fb}^{-1}$ of data with the Belle detector operating at the KEKB asymmetric-energy collider, we report the measurements of the masses, and the first measurements of the instrinsic widths, of the and charmed baryons. We find $M(Sigma_c(2455)^+)-M(Lambda_c^+) = 166.17pm 0.05^{+0.16}_{-0.07} {rm MeV}/c^2$ , $Gamma(Sigma_c(2455)^+) = 2.3 pm 0.3 pm 0.3 {rm MeV/c^2}$ , $M(Sigma_c(2520)^+)-M(Lambda_c^+) = 230.9 pm 0.5 ^{+0.5}_{-0.1} {rm MeV}/c^2$ , and $Gamma(Sigma_c(2520)^+) = 17.2^{+2.3 +3.1}_{-2.1 -0.7} {rm MeV}/c^2$ , where the uncertainties are statistical and systematic, respectively. These measurements can be used to test models of the underlying quark structure of the states.

論文

Measurements of the branching fractions of the semileptonic decays $Xi_{c}^{0} to Xi^{-} ell^{+} nu_{ell}$ and the asymmetry parameter of $Xi_{c}^{0} to Xi^{-} pi^{+}$

Li, Y. B.*; 谷田聖; Belle Collaboration*; 他182名*

Physical Review Letters, 127(12), p.121803_1 - 121803_8, 2021/09

https://doi.org/10.1103/PhysRevLett.127.121803

被引用回数：26 パーセンタイル：91.72(Physics, Multidisciplinary)

Using data samples of 89.5 and 711 fb $^{-1}$ recorded at energies of and GeV, respectively, with the Belle detector at the KEKB collider, we report measurements of branching fractions of semileptonic decays $Xi_{c}^{0} to Xi^{-} ell^{+} nu_{ell}$ ( or ) and the -asymmetry parameter of $Xi_{c}^{0} to Xi^{-} pi^{+}$ decay. The branching fractions are measured to be ${cal B}(Xi_{c}^{0} to Xi^{-} e^{+} nu_{e}$ )=()% and ${cal B}(Xi_{c}^{0} to Xi^{-} mu^{+} nu_{mu}$ )=()%, and the decay parameter $alpha_{Xipi}$ is measured to be with much improved precision compared to the current world average. The corresponding ratio ${cal B}(Xi_{c}^{0} to Xi^{-} e^{+} nu_{e})$ / ${cal B}(Xi_{c}^{0} to Xi^{-} mu^{+} nu_{mu})$ is 1.03 0.05 0.07, which is consistent with the expectation of lepton flavor universality. The first measured asymmetry parameter ${cal A}_{CP} = (alpha_{Xi^{-}pi^{+}} + alpha_{bar{Xi}^{+}pi^{-}})/(alpha_{Xi^{-}pi^{+}} - alpha_{bar{Xi}^{+}pi^{-}}) = 0.024 pm 0.052 pm 0.014$ is found to be consistent with zero. The first and the second uncertainties above are statistical and systematic, respectively, while the third ones arise due to the uncertainty of the $Xi_{c}^{0} to Xi^{-} pi^+$ branching fraction.

論文

Laser-assisted nuclear decay spectroscopy of $^{176,177,179}$ Au

Harding, R. D.*; Andreyev, A. N.; Barzakh, A. E.*; Cubiss, J. G.*; Van Duppen, P.*; Al Monthery, M.*; Althubiti, N. A.*; Andel, B.*; 他26名*

Physical Review C, 104(2), p.024326_1 - 024326_16, 2021/08

https://doi.org/10.1103/PhysRevC.104.024326

被引用回数：5 パーセンタイル：46.8(Physics, Nuclear)

A detailed nuclear spectroscopy study of $^{176,177,179}$ Au was performed at ISOLDE, CERN. This work provides new insights into the low-lying levels in the daughter nuclei $^{172,173,175}$ Ir. For $^{176}$ Au, the nuclear magnetic moments of a high spin and low spin state were determined and used to predict the most likely configuration of each level. Their -decay branching ratios were also extracted: a 58(5)% branching for the low-spin state, and 29(5)% for the high-spin state.

論文

Measurements of partial branching fractions of inclusive $B to X_u , ell^+, nu_{ell}$ decays with hadronic tagging

Cao, L.*; 谷田聖; Belle Collaboration*; 他236名*

Physical Review D, 104(1), p.012008_1 - 012008_32, 2021/07

https://doi.org/10.1103/PhysRevD.104.012008

被引用回数：10 パーセンタイル：65.5(Astronomy & Astrophysics)

We present measurements of partial branching fractions of inclusive semileptonic $B to X_u , ell^+, nu_{ell}$ decays using the full Belle data set of 711 fb $^{-1}$ of integrated luminosity at the resonance and for . Inclusive semileptonic $B to X_u , ell^+, nu_{ell}$ decays are CKM suppressed and measurements are complicated by the large background from CKM-favored $B to X_c , ell^+, nu_{ell}$ transitions, which have a similar signature. Using machine learning techniques, we reduce this and other backgrounds effectively, whilst retaining access to a large fraction of the $B to X_u , ell^+, nu_{ell}$ phase space and high signal efficiency. We measure partial branching fractions in three phase-space regions covering about to of the accessible $B to X_u , ell^+, nu_{ell}$ phase space. The most inclusive measurement corresponds to the phase space with lepton energies of GeV, and we obtain $Delta mathcal{B}(B to X_u ell^+ , nu_ell) = left( 1.59 pm 0.07 pm 0.16 right) times 10^{-3}$ from a two-dimensional fit of the hadronic mass spectrum and the four-momentum-transfer squared distribution, with the uncertainties denoting the statistical and systematic error. We find $left|V_{ub} right| = left( 4.10 pm 0.09 pm 0.22 pm 0.15 right) times 10^{-3}$ from an average of four calculations for the partial decay rate with the third uncertainty denoting the average theory error. This value is higher but compatible with the determination from exclusive semileptonic decays within 1.3 standard deviations.

論文

Search for the $eta_{c2}(1D)$ in $e^+e^-togammaeta_{c2}(1D)$ at near 10.6 GeV at Belle

Jia, S.*; 谷田聖; Belle Collaboration*; 他200名*

Physical Review D, 104(1), p.012012_1 - 012012_9, 2021/07

https://doi.org/10.1103/PhysRevD.104.012012

被引用回数：0 パーセンタイル：0.01(Astronomy & Astrophysics)

For the first time we search for the $eta_{c2}(1D)$ in $e^+e^-togammaeta_{c2}(1D)$ at = 10.52, 10.58, and 10.867 GeV with data samples of 89.5 fb $^{-1}$ , 711 fb $^{-1}$ , and 121.4 fb $^{-1}$ , respectively, accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant $eta_{c2}(1D)$ signal is observed in the mass range between 3.8 and 3.88 GeV/. The upper limit at 90% confidence level on the product of the Born cross section for $e^+e^- to gammaeta_{c2}(1D)$ and branching fraction for $eta_{c2}(1D)to gamma h_c(1P)$ is determined to be $sigma(e^+e^- to gammaeta_{c2}(1D)){cal B}(eta_{c2}(1D)to gamma h_c(1P))$ 4.9 fb at near 10.6 GeV.

論文

Measurement of branching fractions and asymmetries for $D_s^{+} rightarrow K^+ (eta, pi^0)$ and $D_s^{+} rightarrow pi^+ (eta, pi^0)$ decays at Belle

Guan, Y.*; 谷田聖; Belle Collaboration*; 他202名*

Physical Review D, 103(11), p.112005_1 - 112005_11, 2021/06

https://doi.org/10.1103/PhysRevD.103.112005

被引用回数：5 パーセンタイル：45.23(Astronomy & Astrophysics)

We report measurements of the branching fractions and asymmetries for $D_s^{+} rightarrow K^{+} eta$ , $D_s^{+} rightarrow K^{+} pi^0$ , and $D_s^{+} rightarrow pi^{+} eta$ decays, and the branching fraction for $D_s^{+} rightarrow pi^{+} pi^0$ . Our results are based on a data sample corresponding to an integrated luminosity of 921 fb $^{-1}$ collected by the Belle detector at the KEKB asymmetric-energy collider. Our measurements of asymmetries in these decays are the most precise to-date; no evidence for violation is found.

論文

First determination of the spin and parity of the charmed-strange baryon $Xi_{c}(2970)^+$

Moon, T. J.*; 谷田聖; Belle Collaboration*; 他203名*

Physical Review D, 103(11), p.L111101_1 - L111101_9, 2021/06

https://doi.org/10.1103/PhysRevD.103.L111101

被引用回数：18 パーセンタイル：85.82(Astronomy & Astrophysics)

We report results from a study of the spin and parity of $Xi_{c}(2970)^+$ using a $980~mathrm{fb^{-1}}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The decay angle distributions in the chain $Xi_{c}(2970)^+ to Xi_c(2645)^{0}pi^{+} to Xi_c^{+}pi^{-}pi^{+}$ are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the $Xi_{c}(2970)^+$ spin over or , under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of $Xi_{c}(2970)^+$ decay branching fractions $R={mathcal{B}[ Xi_{c}(2970)^+ to Xi_c(2645)^{0}pi^{+} ]}$ / ${ mathcal{B}[ Xi_{c}(2970)^+ to Xi_c^{prime0}pi^{+} ]}$ =1.67 $pm 0.29mathrm{(stat.)}^{ +0.15}_{-0.09}mathrm{(syst.)}$ , where the last uncertainty is due to possible isospin-symmetry-breaking effects. This value favors the spin-parity with the spin of the light-quark degrees of freedom $s_{l}=0$ . This is the first determination of the spin and parity of a charmed-strange baryon.