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Sun, M. D.*; Liu, Z.*; Huang, T. H.*; Zhang, W. Q.*; Andreyev, A. N.; Ding, B.*; Wang, J. G.*; Liu, X. Y.*; Lu, H. Y.*; Hou, D. S.*; et al.
Physics Letters B, 800, p.135096_1 - 135096_5, 2020/01
被引用回数:11 パーセンタイル:78.07(Astronomy & Astrophysics)Fine structure in the decay of U was observed in the fusion-evaporation reaction Re(Ar,p3n) by using fast digital pulse processing technique. Two -decay branches of U feeding the ground state and 244 keV excited state of Th were identified by establishing the decay chain UThRaRn. The -particle energy for the ground-state to ground-state transition of U was determined to be 8993(17) keV, 213 keV higher than the previous value, the half-life was updated to be 62s. Evolution of nuclear structure for =131 even- isotones from Po to U was discussed in the frameworks of nuclear mass and reduced -decay width, a weakening octupole deformation in the ground state of U relative to its lighter isotones Ra and Th was suggested.
Lin, J. Q.*; Liu, X.*; Blackburn, E.*; 脇本 秀一; Ding, H.*; Islam, Z.*; Sinha, S. K.*
Physical Review Letters, 120(19), p.197001_1 - 197001_6, 2018/05
被引用回数:3 パーセンタイル:28.76(Physics, Multidisciplinary)X線散漫散乱の観測により、銅酸化物高温超伝導体LaSrCuO中の不純物Srにより生じるナノスケールの格子歪みを観測した。この結果は、これまで議論となっていた不純物による歪みの性質を明らかにしたとともに、STMで観測されているギャップの不均一性の原因ではないことを明らかにした。
Shand, C. M.*; Podolyk, Zs.*; Grska, M.*; Doornenbal, P.*; Obertelli, A.*; Nowacki, F.*; Otsuka, T.*; Sieja, K.*; Tostevin, J. A.*; Tsunoda, T.*; et al.
Physics Letters B, 773, p.492 - 497, 2017/10
被引用回数:25 パーセンタイル:87.67(Astronomy & Astrophysics)Low-lying states in neutron-rich Zn nuclei were measured for the first time via in-beam -ray spectroscopy at RIKEN. These include the 4 to 2 in Zn and the 2 to 0 and 4 to 2 in Zn. The reduced E() energies and increased E(4)/E(2) ratios at =52,54 compared to Zn attest that the magicity is confined just on the neutron number =50 only. The levels observed in Zn suggest the onset of deformation towards heavier Zn isotopes. The data were compared to state-of-the-art shell model calculations.
Flavigny, F.*; Doornenbal, P.*; Obertelli, A.*; Delaroche, J.-P.*; Girod, M.*; Libert, J.*; Rodriguez, T. R.*; Authelet, G.*; 馬場 秀忠*; Calvet, D.*; et al.
Physical Review Letters, 118(24), p.242501_1 - 242501_6, 2017/06
被引用回数:38 パーセンタイル:87.16(Physics, Multidisciplinary)The first -ray spectroscopy of very neutron rich Kr isotopes was carried out at the RIBF at RIKEN Nishina center. Excited states in these isotopes were populated via (p,2p) reactions using radioactive Rb beams accelerated to 220 MeV/nucleon. The new data show a significant increase in deformation beyond N=60, as well as competing configurations (shape-coexistence) at low energy. The data were compared with beyond-mean-field calculations which predict level energies in good agreement with observation, and suggest oblate-prolate shape coexistence.
Paul, N.*; Corsi, A.*; Obertelli, A.*; Doornenbal, P.*; Authelet, G.*; 馬場 秀忠*; Bally, B.*; Bender, M.*; Calvet, D.*; Chteau, F.*; et al.
Physical Review Letters, 118(3), p.032501_1 - 032501_7, 2017/01
被引用回数:44 パーセンタイル:89.34(Physics, Multidisciplinary)The first measurement of rays emitted by the very neutron rich nuclei Mo (Z=42) and Zr (Z=40) was carried out at the RIBF facility at RIKEN. These data shine light on the postulated N=70 harmonic oscillator shell. If the spin-orbit splitting which gives rise to the N=82 shell gap is reduced in very neutron-rich nuclei, the harmonic oscillator gap at N=70 should open instead. However, both the measured energy of the first excited state Mo and Zr, respectively 235(7) keV and 185(11) keV, and their E(4)/E(2) ratio, indicate that these nuclei are good rotors, and exclude the shell stabilization scenario at Z=40 and N=70. These results were compared to state-of-the-art density functional theoretical calculations using Gogny and Skyrme effective interactions.
Ding, F.*; Luo, G.-N.*; Pitts, R.*; Litnovsky, A.*; Gong, X.*; Ding, R.*; Mao, H.*; Zhou, H.*; Wampler, W. R.*; Stangeby, P. C.*; et al.
Journal of Nuclear Materials, 455(1-3), p.710 - 716, 2014/12
被引用回数:25 パーセンタイル:87.95(Materials Science, Multidisciplinary)A movable material probe system (Material and Plasma Evaluation System: MAPES) with an independent pumping system and a sample exchange chamber has been developed and installed on a horizontal port of the EAST tokamak for studies of plasma material interaction (PMI). In the 2012 experimental campaign, deposition and erosion were studied for three samples: mock-up of the outer first wall panels (FWPs) in ITER, castellated tungsten, and molybdenum mirrors. The FWPs with carbon deposition layer were exposed to helium plasmas. The maximum erosion rate of the carbon was valuated to be 8 nm/s. The castellated tungsten with rectangular cells and roof-like shaped cells was exposed to deuterium plasmas to compare amount of deposits on the gap surface. The amount of carbon and boron impurities on the gap surface of the roof-like shaped cells were reduced to less than 30% compared with that of the rectangular cells. The molybdenum mirrors of which protective ducts are installed in front were exposed to deuterium plasmas in order to investigate effects of length of the ducts. It was found that the reflectivity of the mirrors with 60 mm-long protective ducts is kept the initial reflectivity.
Li, G. S.*; Liu, M. L.*; Zhou, X. H.*; Zhang, Y. H.*; Liu, Y. X.*; Zhang, N. T.*; Hua, W.*; Zheng, Y. D.*; Fang, Y. D.*; Guo, S.*; et al.
Physical Review C, 89(5), p.054303_1 - 054303_9, 2014/05
被引用回数:5 パーセンタイル:37.68(Physics, Nuclear)タンデム加速器で88MeVにまで加速されたOビームを用いてYb(O, 4)反応を起こし、Ptの高スピン準位を調べた。その結果、 1(ここではもしくは)配位による正パリティバンドを大幅に拡張するとともに新しく負パリティバンドを同定し、 配位を持つことを明らかにした。また、イラスト準位においてスピンの増加に伴い振動から回転へと構造変化を起こしている可能性について議論した。さらにバンド特性を明らかにするためにTotal Routhian surface計算を行った。
Wang, H. X.*; Zhang, Y. H.*; Zhou, X. H.*; Liu, M. L.*; Ding, B.*; Li, G. S.*; Hua, W.*; Zhou, H. B.*; Guo, S.*; Qiang, Y. H.*; et al.
Physical Review C, 86(4), p.044305_1 - 044305_11, 2012/10
被引用回数:5 パーセンタイル:33.26(Physics, Nuclear)High-spin states in W have been studied using the Nd(Si,5)W reaction at beam energies of 135 and 140 MeV. The previously known bands associated with the 7/2[633], 5/2[512], and 1/2[521] configurations are extended significantly, and the unfavored signature branch of the 1/2[521] band is established for the first time. The band properties, such as level spacings, band-crossing frequencies, alignment gains, and signature splittings, are discussed with an emphasis on the low-spin signature inversion observed in the 5/2[512] band. By comparing the experimental (1)/(2) ratios with the theoretical values, we conclude that the configuration of the 5/2[512] band is quite pure at low spins without appreciable admixture of the 5/2[523] orbit, in conflict with the particle rotor model calculated results.
Zhou, H. B.*; Zhou, X. H.*; Zhang, Y. H.*; Zheng, Y.*; Liu, M. L.*; Zhang, N. T.*; Chen, L.*; Wang, S. T.*; Li, G. S.*; Wang, H. X.*; et al.
European Physical Journal A, 47(9), p.107_1 - 107_7, 2011/09
被引用回数:4 パーセンタイル:32.55(Physics, Nuclear)Pd原子核の高スピン状態を、タンデム加速器及び多重線検出装置GEMINI-IIを用いて、インビーム線核分光法で調べた。既知のバンド, 1/2[550]バンドをより高スピン状態まで拡張した。発見されたバンド交差は陽子の整列によるものであると解釈した。Pdの回転バンドの性質を周辺の核、及びcranked shell modelと比較・議論した。
Li, G. S.*; Zhou, X. H.*; Zhang, Y. H.*; Zheng, Y.*; Liu, M. L.*; Hua, W.*; Zhou, H. B.*; Ding, B.*; Wang, H. X.*; Lei, X. G.*; et al.
Journal of Physics G; Nuclear and Particle Physics, 38(9), p.095105_1 - 095105_9, 2011/09
被引用回数:1 パーセンタイル:11.64(Physics, Nuclear)Ptの高スピン状態をタンデム加速器と多重線検出装置GEMINI-IIを用いて調べた。低スピン指標逆転現象が7/2[503]バンドで観測された。この現象は、中性子が7/2[503]軌道から7/2[514]軌道に移ることによって起こるという解釈は、DonauとFrauendorfの反古典的近似による計算結果によって支持された。
Jacquinot, J.*; Albajar, F.*; Beaumont, B.*; Becoulet, A.*; Bonicelli, T.*; Bora, D.*; Campbell, D.*; Chakraborty, A.*; Darbos, C.*; Decamps, H.*; et al.
Fusion Engineering and Design, 84(2-6), p.125 - 130, 2009/06
被引用回数:24 パーセンタイル:82.15(Nuclear Science & Technology)ITER用電子サイクロトロン波(EC),イオンサイクロトロン波(IC),中性ビーム(NB)、そして低域混成波(LH)について、その物理と工学の両面の進展を2007/2008年にレビューした。全体仕様の変更はないものの、以下のような設計変更があった。第一に、DTフェーズの前に全パワーである73MW入射をルーティンに入射可能となるように調整すべきこと。第二に、NBを水素フェーズにもフルパワー入射が可能となるように対向壁を用意する、IC用によりロバスト名アンテナ2式を用意する、またECには2MW容量の伝送系を用意して、増力を容易にする。さらにRF源と計測及び加熱用ポートプラグの試験施設となる付属建屋を用意する。第三に、LHのようにITERの長パルス運転時に適した電流駆動システムを開発するための計画の必要性が認識された。
Ding, F.*; 芦川 直子*; 福本 正勝; 片山 一成*; Mao, H.*; Ding, R.*; Xu, Q.*; Wu, J.*; Xie, C. Y.*; Luo, G.-N.*
no journal, ,
Castellated tungsten samples with different gap width and gap depth are exposed to the scrape-off-layer plasma with the material and plasma evaluation system (MAPES) to investigate effects of castellation configurations on impurity deposition and fuel retention. After the plasma exposure, composition and distribution of the impurity deposited on the inner surface of the gap are investigated. The composition and the distribution of the deposits have a strong dependence of the gap configuration. The amount of the deposits on the inner surface of the inverse trapezoid gap is small compared with that of the rectangular gap with the same top width. For all the samples, the amount of the deposits decreases with the gap width and depth.