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論文

Programmable synthesis of silver wheels

Kwon, H.*; Pietrasiak, E.*; 大原 高志; 中尾 朗子*; Chae, B.*; Hwang, C.-C.*; Jung, D.*; Hwang, I.-C.*; Ko, Y. H.*; Kim, K.*; et al.

Inorganic Chemistry, 60(9), p.6403 - 6409, 2021/05

https://doi.org/10.1021/acs.inorgchem.1c00106
 被引用回数：1 パーセンタイル：4.52(Chemistry, Inorganic & Nuclear)

The synthesis of sandwich-shaped multinuclear silver complexes with planar penta- and tetranuclear wheel-shaped silver units and a central anion is reported, along with complete spectroscopic and structural characterization. An NMR mechanistic study reveals that silver complexes were formed in the following order: 2Ag $$rightarrow$$ 3Ag$$^{rm H2O}$$ $$rightarrow$$ 5Ag$$^{rm OH}$$ $$rightarrow$$ 4Ag$$^{rm OH}$$. The central hydroxides in 4Ag$$^{rm OH}$$ and 5Ag$$^{rm OH}$$ exhibit exotic physical properties due to the confined environment inside the complex. The size of these silver wheels can be tuned by changing the central anion or extracting/adding one silver atom. This study provides the facile way to synthesize discrete wheel-shaped multinuclear silver complexes and provides valuable insights into the dynamics of the self-assembly process.

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：8 パーセンタイル：48.61(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.

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：20 パーセンタイル：74.54(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

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：20 パーセンタイル：74.54(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

Demonstration of long-pulse acceleration of high power positive ion beam with JT-60 positive ion source in Japan-Korea joint experiment

小島 有志; 花田 磨砂也; Jeong, S. H.*; Bae, Y. S.*; Chang, D. H.*; Kim, T. S.*; Lee, K. W.*; Park, M.*; Jung, B. K.*; 藻垣 和彦; et al.

Fusion Engineering and Design, 102, p.81 - 87, 2016/01

https://doi.org/10.1016/j.fusengdes.2015.11.033
 被引用回数：8 パーセンタイル：47.39(Nuclear Science & Technology)

原子力機構では、JT-60SAで利用する中性粒子入射装置の実現に向けて、高出力長パルスの正イオン源を開発中であり、今回、JT-60SAの要求値を超える2MWの正イオンビームを100秒間生成することに成功した。本実験は、「日本原子力研究開発機構と韓国国立核融合研究所との間の核融合研究開発に関する協力のための取決め」に基づいた共同実験として韓国原子力研究院において実施した。その結果、ビームの生成時間が30秒を超えると、イオンを生成するための放電ガス圧の変化がビーム電流値の時間的変化を引き起こすことが分かった。さらに、ビーム電流が変化するため、ビーム電流値とイオン源加速電極の電圧配分で決まるビームの収束性が時間とともに悪化していることが判明した。この収束性の悪化により、ビームの一部が加速電極に衝突し、電極の熱負荷が過大となり、加速電極間で絶縁破壊が発生し、ビーム生成時間が制限されていることが初めて分かった。そこで、イオン源の動作ガス圧を制御してビーム電流の時間的変動を低減するとともに、加速電極電圧の配分を細かく調整することでビーム収束性の悪化を抑えて熱負荷を低く保ち、2MWのビームを100秒間生成することに成功した。これらの長時間運転手法の開発と実証により、JT-60SAでの100秒運転に見通しがついた。

論文

$$beta$$ decay of $$^{129}$$Cd and excited states in $$^{129}$$In

Taprogge, J.*; 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*; Xu, Z. Y.*; et al.

Physical Review C, 91(5), p.054324_1 - 054324_11, 2015/05

https://doi.org/10.1103/PhysRevC.91.054324
 被引用回数：25 パーセンタイル：78.85(Physics, Nuclear)

The $$beta$$ decay of $$^{129}$$Cd, produced in relativistic fission of a $$^{238}$$U beam, was studied at the RIKEN Nishina Center. From the $$gamma$$-ray analysis, 31 excited states and 69 $$gamma$$ ray transitions were established in the level scheme of $$^{129}$$In, and compared with state-of-the-art shell-model calculations. It was found that the $$beta$$ decay of $$^{129}$$Cd is dominated by Gamow teller transitions, but a non-negligible contribution to the $$beta$$ decay is also made by first-forbidden transitions. To estimate the contribution of first-forbidden transitions is important for calculations of the $$beta$$-decay half-lives of nuclei in this region.

論文

$$beta$$-decay half-lives of 110 neutron-rich nuclei across the $$N$$=82 shell gap; Implications for the mechanism and universality of the astrophysical $$r$$ process

Lorusso, G.*; 西村 俊二*; Xu, Z. Y.*; Jungclaus, A.*; Shimizu, Y.*; Simpson, G. S.*; S$"o$derstr$"o$m, P.-A.*; Watanabe, H.*; Browne, F.*; Doornenbal, P.*; et al.

Physical Review Letters, 114(19), p.192501_1 - 192501_7, 2015/05

https://doi.org/10.1103/PhysRevLett.114.192501
 被引用回数：186 パーセンタイル：97.71(Physics, Multidisciplinary)

The $$beta$$-decay half-lives of 110 neutron-rich isotopes of the elements from Rb to Sn were measured at the RIBF Facility at RIKEN, Japan. The new data demonstrate the persistence of shell structure far from stability and have direct implications for the $$r$$-process calculations. In particular, the new half-lives have a global impact on the calculated $$r$$-process elemental abundances, and alleviate the underproduction of isotopes just above and below the A=130 peak, which in the past required the introduction of shell structure modifications. Reaction-network calculations based on the new data reinforce the notion that the r-process abundance pattern may result from the freeze-out of a (n,$$gamma$$)$$_leftarrow^{rightarrow}$$($$gamma$$,n) equilibrium.

論文

Identification of a millisecond isomeric state in $$^{129}$$Cd$$_{81}$$ via the detection of internal conversion and Compton electrons

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

Physics Letters B, 738, p.223 - 227, 2014/11

https://doi.org/10.1016/j.physletb.2014.09.047
 被引用回数：24 パーセンタイル：77.81(Astronomy & Astrophysics)

The decay of an isomeric state in the neutron-rich nucleus $$^{129}$$Cd was observed via the detection of internal conversion and Compton electrons. This measurement provided the first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a $$^{238}$$U beam at the RIBF facility at RIKEN. From the measured yields of $$gamma$$ rays and internal conversion electrons, E3 multipolarity was tentatively assigned to the isomeric transition. A half-life of 3.6(2) ms was determined for this new state which, by comparison with shell-model calculations, was tentatively assigned a spin of (21/2$$^+$$).

論文

Yrast 6$$^+$$ seniority isomers of $$^{136,138}$$Sn

Simpson, G. S.*; Gey, G.*; Jungclaus, A.*; Taprogge, J.*; 西村 俊二*; Sieja, K.*; Doornenbal, P.*; Lorusso, G.*; S$"o$derstr$"o$m, P.-A.*; 炭竃 聡之*; et al.

Physical Review Letters, 113(13), p.132502_1 - 132502_6, 2014/09

https://doi.org/10.1103/PhysRevLett.113.132502
 被引用回数：74 パーセンタイル：91.08(Physics, Multidisciplinary)

Delayed $$gamma$$-ray cascades, originating from the decay of 6$$^+$$ isomeric states, in the very neutron-rich, semimagic isotopes $$^{136,138}$$Sn were observed following the projectile fission of a $$^{238}$$U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f$$_{7/2}$$ neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the $$B(E$$2;6$$^+ rightarrow 4^+$$) rate of $$^{136}$$Sn, which deviates from a simple seniority scheme. Empirically reducing the $$nu f$$$$_{7/2}^{2}$$ orbit matrix elements produces a 4+1 state with almost equal seniority 2 and 4 components, correctly reproducing the experimental $$B(E$$2;6$$^+ rightarrow 4^+$$) rate of $$^{136}$$Sn. These data provide a key benchmark for shell-model interactions far from stability.

論文

Monopole-driven shell evolution below the doubly magic nucleus $$^{132}$$Sn explored with the long-lived isomer in $$^{126}$$Pd

Watanabe, H.*; Lorusso, G.*; 西村 俊二*; Otsuka, T.*; Ogawa, K.*; Xu, Z. Y.*; 炭竃 聡之*; S$"o$derstr$"o$m, P.-A.*; Doornenbal, P.*; Li, Z.*; et al.

Physical Review Letters, 113(4), p.042502_1 - 042502_6, 2014/07

https://doi.org/10.1103/PhysRevLett.113.042502
 被引用回数：30 パーセンタイル：77.60(Physics, Multidisciplinary)

A new isomer with a half-life of 23.0(8) ms has been identified in $$^{126}$$Pd at 2406 keV excitation. The proposed spin and parity configuration is 10$$^{+}$$, with maximally aligned configuration of two $$h$$$$_{11/2}$$ neutron hole. $$beta$$-decay from the long-lived isomer was also observed to populated excited states at high spins in $$^{126}$$Ag. The small energy difference between the 10$$^{+}$$ and 7$$^{-}$$ isomers in $$^{126}$$Pd was interpreted in the frame of the monopole shift of the 1$$h$$$$_{11/2}$$ neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below $$^{132}$$Sn are discussed in terms of central and tensor forces.

論文

$$1p_{3/2}$$ proton-hole state in $$^{132}$$Sn and the shell structure along $$N$$=82

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

Physical Review Letters, 112(13), p.132501_1 - 132501_6, 2014/04

https://doi.org/10.1103/PhysRevLett.112.132501
 被引用回数：61 パーセンタイル：88.68(Physics, Multidisciplinary)

A low-lying state in $$^{131}$$In, the one-proton hole nucleus with respect to double magic $$^{132}$$Sn, was observed by its $$gamma$$ decay to the beta emitting isomer. The new state, which was populated both in the beta decay of $$^{131}$$Cd and after beta-delayed neutron emission from $$^{132}$$Cd, was identified, at an excitation energy of 1353 keV, as the previously unknown single-hole state with respect to the $$^{132}$$Sn core. Exploiting this crucial new experimental information, shell-model calculations were performed to study the structure of experimentally inaccessible $$N$$=82 isotones below $$^{132}$$Sn. The results evidence a surprising absence of proton subshell closures along the chain of $$N$$=82 isotones. This finding bears consequences on the evolution of the $$N$$=82 shell gap along the r-process path.

論文

Benchmarking of mechanical test facilities related to ITER CICC steel jackets

Vostner, A.*; Pong, I.*; Bessette, D.*; Devred, A.*; Sgobba, S.*; Jung, A.*; Weiss, K.-P.*; Jewell, M. C.*; Liu, S.*; Yu, W.*; et al.

IEEE Transactions on Applied Superconductivity, 23(3), p.9500705_1 - 9500705_5, 2013/06

https://doi.org/10.1109/TASC.2013.2243895
 被引用回数：14 パーセンタイル：54.41(Engineering, Electrical & Electronic)

ITERの超伝導コイルシステムで使用されるITER用ケーブルインコンジット導体は、ステンレス管(ジャケット)に300本から1440本の素線で構成されるケーブルを収めた構造である。ジャケットは、円形、又は角形のものが用いられ、低炭素型AISI316LNグレードのステンレス鋼又は高マンガンステンレス鋼JK2LBが使用されている。国内機関の試験装置、ITERから指定されたCERN、カールスルーエ工科大学において、ジャケットの母材及び溶接継手の機械試験を室温及び低温(7K以下)で行った。その結果、測定された特性は、各試験装置間でほぼ一致した。本論文では、試験装置のベンチマーク的な観点で、試験結果をまとめ、比較した結果について述べる。

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