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報告書

模擬廃棄物含有リン添加ホウケイ酸ガラス試料のXAFS測定(共同研究)

永井 崇之; 小林 秀和; 嶋村 圭介; 大山 孝一; 捧 賢一; 岡本 芳浩; 塩飽 秀啓; 山中 恵介*; 太田 俊明*

JAEA-Research 2018-005, 72 Pages, 2018/09

JAEA-Research-2018-005.pdf:28.2MB

ガラス固化プロセスで製造されるガラス固化体中の原料ガラス成分や廃棄物成分の局所構造は、固化体に含まれる廃棄物成分による影響を受ける。本研究は、リン添加ホウケイ酸ガラスを原料ガラスに用いて模擬廃棄物ガラス試料を作製し、放射光XAFS測定によりガラス成分の軽元素や廃棄物成分の希土類元素等の化学状態及び局所構造を評価した。

論文

CIELO collaboration summary results; International evaluations of neutron reactions on uranium, plutonium, iron, oxygen and hydrogen

Chadwick, M. B.*; Capote, R.*; Trkov, A.*; Herman, M. W.*; Brown, D. A.*; Hale, G. M.*; Kahler, A. C.*; Talou, P.*; Plompen, A. J.*; Schillebeeckx, P.*; et al.

Nuclear Data Sheets, 148, p.189 - 213, 2018/02

https://doi.org/10.1016/j.nds.2018.02.003
 被引用回数：8 パーセンタイル：4(Physics, Nuclear)

CIELO国際協力では、原子力施設の臨界性に大きな影響を与える重要核種($$^{235}$$U, $$^{238}$$U, $$^{239}$$Pu, $$^{56}$$Fe, $$^{16}$$O, $$^{1}$$H)の中性子断面積データの精度を改善し、これまで矛盾していると考えられた点を解消することを目的として研究が行われた。多くの研究機関が参加したこのパイロットプロジェクトは、IAEAの支援も受けて、OECD/NEAの評価国際協力ワーキングパーティ(WPEC)のSubgroup 40として組織された。本CIELOプロジェクトは、新たな実験研究や理論研究を行う動機付けとなり、測定データを正確に反映し臨界性の積分テストに優れた新たな一連の評価済みライブラリとして結実した。本報告書は、これまでの研究成果と、本国際協力の次の段階の計画概要をまとめたものである。

論文

Detailed $$alpha$$-decay study of $$^{180}$$Tl

Andel, B.*; Andreyev, A.; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; Elseviers, J.*; Fedorov, D. V.*; et al.

Physical Review C, 96(5), p.054327_1 - 054327_11, 2017/12

https://doi.org/10.1103/PhysRevC.96.054327
 パーセンタイル：100(Physics, Nuclear)

A detailed $$alpha$$-decay spectroscopy study of $$^{180}$$Tl has been performed at ISOLDE (CERN). Z-selective ionization by the Resonance Ionization Laser Ion Source (RILIS) coupled to mass separation provided a high-purity beam of $$^{180}$$Tl. Fine-structure $$alpha$$ decays to excited levels in the daughter $$^{176}$$Au were identified and an $$alpha$$-decay scheme of $$^{180}$$Tl was constructed based on an analysis of $$alpha$$-$$gamma$$ and $$alpha$$-$$gamma$$ -$$gamma$$ coincidences. Multipolarities of several $$gamma$$-ray transitions deexciting levels in $$^{176}$$Au were determined. Based on the analysis of reduced $$alpha$$-decay widths, it was found that all $$alpha$$ decays are hindered, which signifies a change of configuration between the parent and all daughter states.

論文

The CIELO collaboration; Progress in international evaluations of neutron reactions on Oxygen, Iron, Uranium and Plutonium

Chadwick, M. B.*; Capote, R.*; Trkov, A.*; Kahler, A. C.*; Herman, M. W.*; Brown, D. A.*; Hale, G. M.*; Pigni, M.*; Dunn, M.*; Leal, L.*; et al.

EPJ Web of Conferences (Internet), 146, p.02001_1 - 02001_9, 2017/09

https://doi.org/10.1051/epjconf/201714602001
 被引用回数：4 パーセンタイル：0.6

CIELO共同研究では中性子断面積データの改善及びこれまでの評価で見られた断面積の不一致を解決することを目的として、原子力の臨界性に大きな影響を与える5核種($$^{16}$$O, $$^{56}$$Fe, $$^{235,238}$$U, $$^{239}$$Pu)の中性子断面積を評価している。この国際パイロットプロジェクトでは、経済協力開発機構・原子力機関・核データ評価国際協力ワーキングパーティに設置されたサブグループ40の下でIAEAからのサポートを受けて、実験並びに理論的な研究を活発に実施している。これらの研究を通じて測定データを精度よく反映し、さらに臨界性に関する積分テストで良い結果を示す新しい評価済ライブラリを開発している。

論文

Observation of a $$gamma$$-decaying millisecond isomeric state in $$^{128}$$Cd$$_{80}$$

Jungclaus, A.*; Grawe, H.*; 西村 俊二*; Doornenbal, P.*; Lorusso, G.*; Simpson, G. S.*; S$"o$derstr$"o$m, P.-A.*; 炭竃 聡之*; Taprogge, J.*; Xu, Z. Y.*; et al.

Physics Letters B, 772, p.483 - 488, 2017/09

https://doi.org/10.1016/j.physletb.2017.07.006
 被引用回数：4 パーセンタイル：30.79(Astronomy & Astrophysics)

A new high-spin isomer in the neutron-rich nucleus $$^{128}$$Cd was populated in the projectile fission of a $$^{238}$$U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T$$_{1/2}$$ = 6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15$$^-$$). The isomeric state decays via the emission of a 309-keV $$gamma$$ ray with $$E3$$ multipolarity. The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus $$^{129}$$Cd. The comparison with calculations shows that adjustments of the pairing and multipole parts of the effective interaction derived from the CD-Bonn nucleon-nucleon potential are required in order to describe the properties of nuclei in the region around $$^{132}$$Sn.

報告書

模擬廃棄物ホウケイ酸ガラス試料のXAFS測定(共同研究)

永井 崇之; 小林 秀和; 捧 賢一; 菖蒲 康夫; 岡本 芳浩; 塩飽 秀啓; 山中 恵介*; 太田 俊明*

JAEA-Research 2017-005, 54 Pages, 2017/06

JAEA-Research-2017-005.pdf:16.17MB

ガラス固化プロセスで製造されるガラス固化体中のホウ素(B)や廃棄物成分の局所構造は、固化体に含まれる廃棄物成分による影響を受ける。本研究は、模擬廃棄物ガラス試料を作製し、放射光XAFS測定によるガラス試料中のB及び廃棄物成分の局所構造を評価した。BのK吸収端XAFS測定において、薄板状の試料を用いて良好なXANESスペクトルが得られることを確認し、原料ガラスに廃棄物成分を添加するとB-Oの3配位sp$$^{2}$$構造(BO$$_{3}$$)割合が減少して4配位sp$$^{3}$$構造(BO$$_{4}$$)割合が増加することを明らかにした。また、組成のSiO$$_{2}$$/B$$_{2}$$O$$_{3}$$比の低下又は(SiO$$_{2}$$+B$$_{2}$$O$$_{3}$$)/Al$$_{2}$$O$$_{3}$$比の上昇によって、BO$$_{3}$$割合が増加しBO$$_{4}$$割合が減少すること、P$$_{2}$$O$$_{5}$$の添加によって、BO$$_{3}$$割合が減少しBO$$_{4}$$割合が増加することを明らかにした。廃棄物成分のXAFS測定において、B$$_{2}$$O$$_{3}$$含有率が高い組成ほどセリウム(Ce)原子価が還元されること、原料ガラスへP$$_{2}$$O$$_{5}$$を添加するとCe原子価が還元されることを確認した。またイメージング測定により、ガラス中に析出するRu化合物の状況は組成のB$$_{2}$$O$$_{3}$$含有率を変えても変わらなかった。本研究は、資源エネルギー庁より日本原子力研究開発機構が受託した次世代再処理ガラス固化技術基盤研究事業の実施項目「高レベル廃液ガラス固化の高度化」の一つとして実施した。

論文

Research progress at the Slow Positron Facility in the Institute of Materials Structure Science, KEK

兵頭 俊夫*; 和田 健*; 望月 出海*; 木村 正雄*; 峠 暢一*; 設楽 哲夫*; 深谷 有喜; 前川 雅樹*; 河裾 厚男*; 飯田 進平*; et al.

Journal of Physics; Conference Series, 791(1), p.012003_1 - 012003_8, 2017/02

https://doi.org/10.1088/1742-6596/791/1/012003
 被引用回数：2 パーセンタイル：9.52

本論文では、高エネルギー加速器研究機構(KEK)物質構造科学研究所(IMSS)低速陽電子実験施設(SPF)で得られた最近の成果を報告する。全反射高速陽電子回折(TRHEPD)実験では、ルチル型TiO$$_{2}$$(110)($$1times2$$)表面、Cu(111)およびCo(0001)基板上のグラフェン、Al(111)基板上のゲルマネンの構造を明らかにした。ポジトロニウム負イオン(Ps$$^{-}$$)ステーションでは、Ps$$^{-}$$の共鳴状態の観測に成功した。ポジトロニウム飛行時間測定(Ps-TOF)ステーションでは、ポジトロニウムの生成効率の増大とポジトロニウム生成・放出過程におけるエネルギー損失を観測した。陽電子ビームラインにパルスストレッチングセクションが導入され、陽電子ビームのパルス幅が1.2$$mu$$sから20msまで可変になった。

論文

Identification of the crossing point at $$N$$ = 21 between normal and intruder configurations

Lic$u{a}$, R.*; Rotaru, F.*; Borge, M. J. G.*; Gr$'e$vy, S.*; Negoita, F.*; Poves, A.*; Sorlin, O.*; Andreyev, A.; Borcea, R.*; Costache, C.*; et al.

Physical Review C, 95(2), p.021301_1 - 021301_6, 2017/02

https://doi.org/10.1103/PhysRevC.95.021301
 被引用回数：6 パーセンタイル：18.72(Physics, Nuclear)

The $$beta^{-}$$ decay of $$^{34}$$Mg was used to study the $$^{34}$$Al nucleus through $$gamma$$ spectroscopy at the Isotope Separator On-Line facility of CERN. Previous studies identified two $$beta$$-decaying states in $$^{34}$$Al having spin-parity assignments $$J^{pi}$$=4$$^{-}$$ dominated by the normal configuration $$pi$$(d5/2)$$^{-1}$$ $$bigoplus$$ $$nu$$(f7/2) and $$J^{pi}$$ = 1$$^{+}$$ by the intruder configuration $$pi$$(d5/2)$$^{-1}$$ $$bigoplus$$ $$nu$$(d3/2)$$^{-1}$$(f7/2)$$^{2}$$. Their unknown ordering and relative energy have been the subject of debate for the placement of $$^{34}$$Al inside or outside the $$N$$ = 20 "island of inversion". We report here that the 1$$^{+}$$ intruder lies only 46.6 keV above the 4$$^{-}$$ ground state. In addition, a new half-life of $$T_{1/2}$$=44.9(4)ms, that is twice as long as thepreviously measured 20(10) ms, has been determined for $$^{34}$$Mg. Large-scale shell-model calculations with the recently developed SDPF-U-MIX interaction are compared with the new data and used to interpret the mechanisms at play at the very border of the $$N$$ = 20 island of inversion.

論文

Type II shell evolution in $$A=70$$ isobars from the $$N geq 40$$ island of inversion

Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; 角田 佑介*; Otsuka, T.*; 西村 俊二*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; et al.

Physics Letters B, 765, p.328 - 333, 2017/02

https://doi.org/10.1016/j.physletb.2016.12.025
 被引用回数：10 パーセンタイル：8.11(Astronomy & Astrophysics)

The level schemes of neutron-rich isotopes $$^{70}$$Co and $$^{70}$$Ni were populated in the $$beta$$ decay of $$^{70}$$Fe and studied using $$beta$$-delayed $$gamma$$-ray spectroscopy of the $$beta$$ decay, at the RIBF in RIKEN, Japan. The experimental results were compared to state-of-the-art shell-model calculations, and indicate a dominance of prolate deformation in the low-lying states, coexisting with spherical states. The $$beta$$ decay of the $$A=70$$ isobars is shown to progress in accordance to a new type of shell evolution, the so-called Type II, which involves many particle-hole excitations across energy gaps.

報告書

模擬廃棄物ガラス試料(バナジウム含有ホウケイ酸ガラス)のXAFS測定

永井 崇之; 小林 秀和; 捧 賢一; 菖蒲 康夫; 岡本 芳浩; 塩飽 秀啓; 松浦 治明*; 内山 孝文*; 岡田 往子*; 根津 篤*; et al.

JAEA-Research 2016-015, 52 Pages, 2016/11

JAEA-Research-2016-015.pdf:37.48MB

本研究は、資源エネルギー庁の次世代再処理ガラス固化技術基盤研究事業の実施項目「高レベル廃液ガラス固化の高度化」として、バナジウム(V)含有模擬廃棄物ガラスを対象に、放射光XAFS測定によりガラス原料に内包された廃棄物成分元素の局所構造を評価した。本研究で得られた成果を、以下に列挙する。(1)バナジウム(V)は、組成に関係なく比較的安定な4配位構造と考えられ、ガラス原料フリットではVがガラス相に存在する可能性が高い。(2)亜鉛(Zn), セリウム(Ce), ネオジム(Nd), ジルコニウム(Zr), モリブデン(Mo)はガラス相に存在し、Ce原子価はガラス組成によって3価と4価の割合に差が認められた。(3)ルテニウム(Ru)はガラス相からRuO$$_{2}$$として析出し、ロジウム(Rh)は金属と酸化物が混在し、パラジウム(Pd)は金属として析出する。(4)高温XAFS測定を行ったZrとMoの結果、ガラス溶融状態におけるZr, Moの局所構造の秩序が低下する傾向を確認した。(5)ガラス溶融炉温度1200$$^{circ}$$Cの条件で、模擬廃棄物ガラスの高温XAFS測定を行い、今後、試料セルの形状等の最適化を図ることで、良質な局所構造データ取得が期待できる。

論文

Beta-delayed proton emission from $$^{20}$$Mg

Lund, M. V.*; Andreyev, A.; Borge, M. J. G.*; Cederk$"a$ll, J.*; De Witte, H.*; Fraile, L. M.*; Fynbo, H. O. U.*; Greenlees, P. T.*; Harkness-Brennan, L. J.*; Howard, A. M.*; et al.

European Physical Journal A, 52(10), p.304_1 - 304_14, 2016/10

https://doi.org/10.1140/epja/i2016-16304-x
 被引用回数：8 パーセンタイル：22.35(Physics, Nuclear)

Beta-delayed proton emission from $$^{20}$$Mg has been measured at ISOLDE, CERN, with the ISOLDE Decay Station setup including both charged-particle and $$gamma$$-ray detection capabilities. A total of 27 delayed proton branches were measured including seven so far unobserved. An updated decay scheme, including three new resonances above the proton separation energy in $$^{20}$$Na and more precise resonance energies, is presented. Beta-decay feeding to two resonances above the Isobaric Analogue State in $$^{20}$$Na is observed. This may allow studies of the 4032.9(2.4) keV resonance in $$^{19}$$Ne through the beta decay of $$^{20}$$Mg, which is important for the astrophysically relevant reaction $$^{15}$$O($$alpha$$,$$gamma$$)$$^{19}$$Ne. Beta-delayed protons were used to obtain a more precise value for the half-life of $$^{20}$$Mg, 91.4(1.0) ms.

論文

Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning

Frandsen, B. A.*; Liu, L.*; Cheung, S. C.*; Guguchia, Z.*; Khasanov, R.*; Morenzoni, E.*; Munsie, T. J. S.*; Hallas, A. M.*; Wilson, M. N.*; Cai, Y.*; et al.

Nature Communications (Internet), 7, p.12519_1 - 12519_8, 2016/08

https://doi.org/10.1038/ncomms12519
 被引用回数：7 パーセンタイル：40.56(Multidisciplinary Sciences)

RENiO$$_3$$ (RE = rare-earth element) and V$$_2$$O$$_3$$ are archetypal Mott insulator systems. When tuned by chemical substitution (RENiO$$_3$$) or pressure (V$$_2$$O$$_3$$), they exhibit a quantum phase transition (QPT) between an antiferromagnetic Mott insulating state and a paramagnetic metallic state. Because novel physics often appears near a Mott QPT, the details of this transition, such as whether it is first or second order, are important. Here, we demonstrate through muon spin relaxation/rotation experiments that the QPT in RENiO$$_3$$ and V$$_2$$O$$_3$$ is first order: the magnetically ordered volume fraction decreases to zero at the QPT, resulting in a broad region of intrinsic phase separation, while the ordered magnetic moment retains its full value until it is suddenly destroyed at the QPT. These findings bring to light a surprising universality of the pressure-driven Mott transition, revealing the importance of phase separation and calling for further investigation into the nature of quantum fluctuations underlying the transition.

論文

$$beta$$ decay of semi-magic $$^{130}$$Cd; Revision and extension of the level scheme of $$^{130}$$In

Jungclaus, A.*; Grawe, H.*; 西村 俊二*; Doornenbal, P.*; Lorusso, G.*; Simpson, G. S.*; S$"o$derstr$"o$m, P. A.*; 炭竃 聡之*; Taprogge, J.*; Xu, Z. Y.*; et al.

Physical Review C, 94(2), p.024303_1 - 024303_8, 2016/08

https://doi.org/10.1103/PhysRevC.94.024303
 被引用回数：8 パーセンタイル：31.2(Physics, Nuclear)

The $$beta$$ decay of the semi-magic nucleus $$^{130}$$Cd has been studied at the RIBF facility at the RIKEN Nishina Center. The high statistics of the present experiment allowed for a revision of the established level scheme of $$^{130}$$In and the observation of additional $$beta$$ feeding to high lying core-excited states in $$^{130}$$In. The experimental results are compared to shell-model calculations employing a model space consisting of the full major $$N=50-82$$ neutron and $$Z=28-50$$ proton shells, and good agreement is found.

論文

Short-lived isomers in $$^{192}$$Po and $$^{194}$$Po

Andel, B.*; Andreyev, A.; Antalic, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Hofmann, S.*; Huyse, M.*; Kalaninov$'a$, Z.*; Kindler, B.*; Kojouharov, I.*; et al.

Physical Review C, 93(6), p.064316_1 - 064316_12, 2016/06

https://doi.org/10.1103/PhysRevC.93.064316
 パーセンタイル：100(Physics, Nuclear)

Isomeric states in $$^{194}$$Po and $$^{192}$$Po were studied at the velocity filter SHIP. The isotopes were produced in the fusion-evaporation reactions $$^{141}$$Pr($$^{56}$$Fe, $$p2n$$)$$^{194}$$Po and $$^{144}$$Sm($$^{51}$$V, $$p2n$$)$$^{192}$$Po. Several new $$gamma$$-ray transitions were attributed to the isomers and $$gamma$$-$$gamma$$ coincidences for both isomers were studied for the first time. The 459-keV transition earlier, tentatively proposed as de-exciting the isomeric level in $$^{194}$$Po, was replaced by a new 248-keV transition, and the spin of this isomer was reassigned from (11$$^{-}$$) to (10$$^{-}$$). The de-excitation of the (11$$^{-}$$) isomeric level in $$^{192}$$Po by the 154-keV transition was confirmed and a parallel de-excitation by a 733-keV (E3) transition to (8$$^{+}$$) level of the ground-state band was suggested. Moreover, side feeding to the (4$$^{+}$$) level of the ground-state band was proposed. The paper also discusses strengths of transitions de-exciting 11$$^{-}$$ isomers in neighboring Po and Pb isotopes.

論文

First observation of $$gamma$$ rays emitted from excited states south-east of $$^{132}$$Sn; The $$pi$$ g$$_{9/2}^{-1}$$ $$ otimes$$ $$nu f_{7/2}$$ multiplet of $$^{132}$$In$$_{83}$$

Jungclaus, A.*; Gargano, A.*; Grawe, H.*; Taprogge, J.*; 西村 俊二*; Doornenbal, P.*; Lorusso, G.*; Shimizu, Y.*; Simpson, G. S.*; S$"o$derstr$"o$m, P.-A.*; et al.

Physical Review C, 93(4), p.041301_1 - 041301_6, 2016/04

https://doi.org/10.1103/PhysRevC.93.041301
 被引用回数：7 パーセンタイル：26.65(Physics, Nuclear)

For the first time, the decay of excited states in a nucleus situated "south-east" of $$^{132}$$Sn have been observed, in a region where experimental information is limited to ground-state properties. Six $$gamma$$ rays from $$^{133}$$Cd, produced in the fragmentation of a $$^{238}$$U beam at RIBF at RIKEN. The $$gamma$$ rays were studied using the EURICA array of Ge detectors. The new experimental information is compared to results from realistic shell-model calculations, which are the first in this region far from stability. Comparison with calculations suggests that at least four out of six new transitions can be attributed to the particle-hole configuration of one neutron in the $$f_{7/2}$$ and one proton hole in the $$g_{9/2}$$ orbits, respectively. This work constitutes an important first step towards the exploration of nuclear structure in this unknown region of the nuclear chart.

論文

Fast-timing study of the $$l$$-forbidden 1/2$$^+$$ $$rightarrow$$ 3/2$$^+$$ $$M1$$ transition in $$^{129}$$Sn

Lic$u{a}$, R.*; Mach, H.*; Fraile, L. M.*; Gargano, A.*; Borge, M. J. G.*; M$u{a}$rginean, N.*; Sotty, C. O.*; Vedia, V.*; Andreyev, A.; Benzoni, G.*; et al.

Physical Review C, 93(4), p.044303_1 - 044303_7, 2016/04

https://doi.org/10.1103/PhysRevC.93.044303
 被引用回数：5 パーセンタイル：36.63(Physics, Nuclear)

The levels in $$^{129}$$Sn populated from the $$beta^-$$ decay of $$^{129}$$In isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station. The lowest 1/2$$^+$$ state and the 3/2$$^+$$ ground state in $$^{129}$$Sn are expected to have configurations dominated by the neutron $$s_{1/2}$$ ($$l$$=0) and $$d_{3/2}$$ ($$l$$=2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow $$l$$-forbidden $$M1$$ transition. Using fast-timing spectroscopy we have measured the half-life of the 1/2$$^+$$ 315.3-keV state, $$T_{1/2}$$ = 19(10) ps, which corresponds to a moderately fast $$M1$$ transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effective charges and $$g$$ factors, predict a 4-ns half-life for this level. We can reconcile the shell-model calculations to the measured $$T_{1/2}$$ value by the renormalization of the $$M1$$ effective operator for neutron holes.

論文

Low-lying excitations in $$^{72}$$Ni

Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; 西村 俊二*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; Lorusso, G.*; Patel, Z.*; et al.

Physical Review C, 93(3), p.034328_1 - 034328_14, 2016/03

https://doi.org/10.1103/PhysRevC.93.034328
 被引用回数：11 パーセンタイル：14.96(Physics, Nuclear)

Low-lying excited states in $$^{72}$$Ni have been investigated at RIKEN by studying the $$beta$$ decay of $$^{72}$$Co to $$^{72}$$Ni. $$^{72}$$Co was separated with BigRIPS, implanted into the WaS3ABi Silicon array, and the $$gamma$$ ray measured using the EURICA $$gamma$$ spectrometer. From the analysis, 60 new $$gamma$$-ray transitions and 21 new levels in $$^{72}$$Ni were observed. The new experimental information is compared to shell-model calculations which include neutron excitation across the $$fpg$$ shell. The calculations reproduce rather well the observed states, implying that a clear understanding of these low-lying excitations has been achieved.

論文

国際核融合エネルギー研究センターの高性能計算機システムHeliosを利用した国内シミュレーション研究プロジェクトの進展

石澤 明宏*; 井戸村 泰宏; 今寺 賢志*; 糟谷 直宏*; 菅野 龍太郎*; 佐竹 真介*; 龍野 智哉*; 仲田 資季*; 沼波 政倫*; 前山 伸也*; et al.

プラズマ・核融合学会誌, 92(3), p.157 - 210, 2016/03

http://www.jspf.or.jp/Journal/PDF_JSPF/jspf2016_03/jspf2016_03-157.pdf

幅広いアプローチ協定に基づいて国際核融合エネルギー研究センター(IFERC)の計算機シミュレーションセンター(CSC)に設置された高性能計算機システムHeliosは、2012年1月に運用を開始し、日欧の磁気核融合シミュレーション研究に供用され、高い利用率の実績を示すとともに、炉心プラズマ物理から炉材料・炉工学にわたる広い分野で多くの研究成果に貢献している。本プロジェクトレビューの目的は、国内の大学や研究機関においてHeliosを利用して進められているシミュレーション研究プロジェクトとその成果を一望するとともに、今後予想される研究の進展を紹介することである。はじめにIFERC-CSCの概要を示した後、各研究プロジェクト毎にその目的、用いられる計算手法、これまでの研究成果、そして今後必要とされる計算を紹介する。

論文

Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

吉田 雅洋*; 石井 賢司; 中 惇*; 石原 純夫*; Jarrige, I.*; 池内 和彦*; 村上 洋一*; 工藤 一貴*; 小池 洋二*; 永田 知子*; et al.

Scientific Reports (Internet), 6, p.23611_1 - 23611_8, 2016/03

https://doi.org/10.1038/srep23611
 パーセンタイル：100(Multidisciplinary Sciences)

In strongly correlated electron systems, enhanced fluctuations in the proximity of the ordered states of electronic degrees of freedom often induce anomalous electronic properties such as unconventional superconductivity. While spin fluctuations in the energy-momentum space have been studied widely using inelastic neutron scattering, other degrees of freedom, i.e., charge and orbital, have hardly been explored thus far. Here, we use resonant inelastic X-ray scattering to observe charge fluctuations proximate to the charge-order phase in transition metal oxides. In the two-leg ladder of Sr$$_{14-x}$$Ca$$_x$$Cu$$_{24}$$O$$_{41}$$, charge fluctuations are enhanced at the propagation vector of the charge order ($$mathbf{q}_mathrm{CO}$$) when the order is melted by raising the temperature or by doping holes. In contrast, charge fluctuations are observed not only at $$mathbf{q}_mathrm{CO}$$ but also at other momenta in a geometrically frustrated triangular bilayer lattice of LuFe$$_2$$O$$_4$$. The observed charge fluctuations have a high energy ($$sim$$ 1 eV), suggesting that the Coulomb repulsion between electrons plays an important role in the formation of the charge order.

論文

Decay properties of $$^{68,69,70}$$Mn; Probing collectivity up to N=44 in Fe isotopic chain

Benzoni, G.*; Morales, A. I.*; Watanabe, H.*; 西村 俊二*; Coraggio, L.*; Itaco, N.*; Gargano, A.*; Browne, F.*; Daido, R.*; Doornenbal, P.*; et al.

Physics Letters B, 751, p.107 - 112, 2015/12

https://doi.org/10.1016/j.physletb.2015.10.025
 被引用回数：14 パーセンタイル：15.32(Astronomy & Astrophysics)

The $$beta$$ decays of $$^{68,69,70}$$Mn have been measured at the RIBF facility at RIKEN using the EURICA $$gamma$$ spectrometer combined with an active stopper consisting of a stack of Si detectors. Half-lives and $$beta$$-delayed neutron emission probabilities have been extracted for these decays, together with first experimental information on excited states populated in $$^{69,70}$$Fe. The data indicate a continuously increasing deformation for Fe isotopes up to A=70, and interpreted to be due to the interplay between quadrupole correlation of specific neutron orbitals and the monopole component of the proton-neutron interaction.

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