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Journal Articles

Fine structure in the $$alpha$$ decay of $$^{223}$$U

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

 Times Cited Count:1 Percentile:22.94(Astronomy & Astrophysics)

Journal Articles

Dirac surface state-modulated spin dynamics in a ferrimagnetic insulator at room temperature

Tang, C.*; Song, Q.*; Chang, C.-Z.*; Xu, Y.*; Onuma, Yuichi; Matsuo, Mamoru*; Liu, Y.*; Yuan, W.*; Yao, Y.*; Moodera, J. S.*; et al.

Science Advances (Internet), 4(6), p.eaas8660_1 - eaas8660_6, 2018/06

 Times Cited Count:6 Percentile:27.44(Multidisciplinary Sciences)

Journal Articles

Quantitative characterization of the nanoscale local lattice strain induced by Sr dopants in La$$_{1.92}$$Sr$$_{0.08}$$CuO$$_{4}$$

Lin, J. Q.*; Liu, X.*; Blackburn, E.*; Wakimoto, Shuichi; Ding, H.*; Islam, Z.*; Sinha, S. K.*

Physical Review Letters, 120(19), p.197001_1 - 197001_6, 2018/05

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

The nanometer scale lattice deformation brought about by the dopants in the high temperature superconducting cuprate La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ $$(x=0.08)$$ was investigated by measuring the associated X-ray diffuse scattering around multiple Bragg peaks. Our results address the long-term concern of dopant introduced local lattice inhomogeneity, and show that the associated nanometer scale lattice deformation is marginal and cannot be responsible for the patched variation in the spectral gaps observed with scanning tunneling microscopy in the cuprates.

Journal Articles

The $$^{95}$$Zr($$n, gamma$$)$$^{96}$$Zr cross section from the surrogate ratio method and its effect on $$s$$-process nucleosynthesis

Yan, S. Q.*; Li, Z. H.*; Wang, Y. B.*; Nishio, Katsuhisa; Lugaro, M.*; Karakas, A. I.*; Makii, Hiroyuki; Mohr, P.*; Su, J.*; Li, Y. J.*; et al.

Astrophysical Journal, 848(2), p.98_1 - 98_8, 2017/10

 Times Cited Count:0 Percentile:100(Astronomy & Astrophysics)

Journal Articles

Examination of the surrogate ratio method for the determination of the $$^{93}$$Zr(n,$$gamma$$)$$^{94}$$Zr cross section with $$^{90,92}$$Zr($$^{18}$$O,$$^{16}$$O)$$^{92,94}$$Zr reactions

Yan, S. Q.*; Li, Z. H.*; Wang, Y. B.*; Nishio, Katsuhisa; Makii, Hiroyuki; Su, J.*; Li, Y. J.*; Nishinaka, Ichiro; Hirose, Kentaro; Han, Y. L.*; et al.

Physical Review C, 94(1), p.015804_1 - 015804_5, 2016/07

 Times Cited Count:3 Percentile:61.81(Physics, Nuclear)

Journal Articles

Searching for observable effects induced by anomalous triangle singularities

Liu, X.-H.*; Oka, Makoto; Zhao, Q.*

Physics Letters B, 753, p.297 - 302, 2016/02

 Times Cited Count:65 Percentile:0.94(Astronomy & Astrophysics)

We investigate the anomalous triangle singularity (ATS) and its possible manifestations in various processes. We show that the ATS should have important impact on our understanding of the nature of some newly observed threshold states. Discussions on how to distinguish the ATS phenomena from genuine dynamic pole structures are presented.

Journal Articles

Enhanced damage buildup in C$$^{+}$$-implanted GaN film studied by a monoenergetic positron beam

Li, X. F.*; Chen, Z. Q.*; Liu, C.*; Zhang, H.; Kawasuso, Atsuo

Journal of Applied Physics, 117(8), p.085706_1 - 085706_6, 2015/02

 Times Cited Count:22 Percentile:20.9(Physics, Applied)

Vacancy-type defects in C$$^{+}$$-implanted GaN were probed using a slow positron beam. The increase of Doppler broadening S parameter indicates introduction of arge vacancy clusters. Post-implantation annealing at temperatures up to 800$$^{circ}$$C makes these vacancy clusters to agglomerate into microvoids. The vacancy clusters or microvoids show high thermal stability, and they are only partially removed after annealing up to 1000$$^{circ}$$C. Amorphous regions are observed by high resolution transmission electron microscopy measurement, which directly confirms that amorphization is induced by C$$^{+}$$-implantation. The disordered GaN lattice is possibly due to special feature of carbon impurities, which enhance the damage buildup during implantation.

Journal Articles

Dynamics of energetic particle driven modes and MHD modes in wall-stabilized high-$$beta$$ plasmas on JT-60U and DIII-D

Matsunaga, Go; Okabayashi, Michio*; Aiba, Nobuyuki; Boedo, J. A.*; Ferron, J. R.*; Hanson, J. M.*; Hao, G. Z.*; Heidbrink, W. W.*; Holcomb, C. T.*; In, Y.*; et al.

Nuclear Fusion, 53(12), p.123022_1 - 123022_13, 2013/12

 Times Cited Count:2 Percentile:88.19(Physics, Fluids & Plasmas)

Journal Articles

Diluted ferromagnetic semiconductor Li(Zn,Mn)P with decoupled charge and spin doping

Deng, Z.*; Zhao, K.*; Gu, B.; Han, W.*; Zhu, J. L.*; Wang, X. C.*; Li, X.*; Liu, Q. Q.*; Yu, R. C.*; Goko, Tatsuo*; et al.

Physical Review B, 88(8), p.081203_1 - 081203_5, 2013/08

 Times Cited Count:58 Percentile:6.84(Materials Science, Multidisciplinary)

Journal Articles

Anisotropic two-dimensional electron gas at the LaAlO$$_{3}$$/SrTiO$$_{3}$$ (110) interface

Annadi, A.*; Zhang, Q.*; Renshaw Wang, X.*; Tuzla, N.*; Gopinadhan, K.*; L$"u$, W. M.*; Roy Barman, A.*; Liu, Z. Q.*; Srivastava, A.*; Saha, S.*; et al.

Nature Communications (Internet), 4, p.1838_1 - 1838_7, 2013/05

 Times Cited Count:80 Percentile:4.26(Multidisciplinary Sciences)

Journal Articles

Dynamics of energetic particle driven modes and MHD modes in wall-stabilized high beta plasmas on JT-60U and DIII-D

Matsunaga, Go; Okabayashi, Michio*; Aiba, Nobuyuki; Boedo, J. A.*; Ferron, J. R.*; Hanson, J. M.*; Hao, G. Z.*; Heidbrink, W. W.*; Holcomb, C. T.*; In, Y.*; et al.

Proceedings of 24th IAEA Fusion Energy Conference (FEC 2012) (CD-ROM), 8 Pages, 2013/03

Journal Articles

Sensitivity analysis of a passive decay heat removal system under a post-loss of coolant accident condition

Liu, Q.; Homma, Toshimitsu

Journal of Nuclear Science and Technology, 49(9), p.897 - 909, 2012/09

 Times Cited Count:3 Percentile:68.31(Nuclear Science & Technology)

Passive safety features are now of interest to the design of future generation reactors. Though passive safety systems are considered to be more reliable, the large uncertainty associated with the system response can not be ignored. It is necessary to identify the uncertain inputs that have the important impact on the uncertainty of the system performance. In this study, two global sensitivity measures, the first-order sensitivity index and the total-order sensitivity index, are applied to a passive decay heat removal system of a gas-cooled fast reactor for identifying the key uncertainty inputs. It is found that the uncertainty in the system pressure contributes the most to the uncertainty in the system outputs. In addition, the cooler wall temperature, the Nusselt number and the friction factor in the mixed convectional flow regime also have small impact on the uncertainty of the system outputs.

Journal Articles

Pressure effect on intersite charge transfer in A-site-ordered double-perovskite-structure oxide

Long, Y.-W.*; Kawakami, Takateru*; Chen, W.-T.*; Saito, Takashi*; Watanuki, Tetsu; Nakakura, Yuta*; Liu, Q.-Q.*; Jin, C.-Q.*; Shimakawa, Yuichi*

Chemistry of Materials, 24(11), p.2235 - 2239, 2012/06

 Times Cited Count:29 Percentile:27.14(Chemistry, Physical)

An A-site ordered perovskite-structure oxide, LaCu$$_{3}$$Fe$$_{4}$$O$$_{12}$$, shows unusual intermetallic charge transfer between the A-site Cu and the B-site Fe ions. Like temperature, pressure also induces the intermetallic charge transfer at room temperature and the compound changes from low-pressure LaCu$$^{3+}$$$$_{3}$$Fe$$^{3+}$$$$_{4}$$O$$_{12}$$ to high-pressure LaCu$$^{2+}$$$$_{3}$$Fe$$^{3.75+}$$$$_{4}$$O$$_{12}$$ accompanying with significant volume collapse and as well as unusual softening in bulk modulus. In addition, the material was changed from an antiferromagnetic insulator to a paramagnetic metal transition. Either by physical or chemical (cation substitution) pressure, the charge-transfer transition temperature decreases, and the lower volume phase stabilizes Cu$$^{2+}$$ and Fe$$^{3.75+}$$ at the A and B sites, respectively.

Journal Articles

A Simple method for estimating the structure temperatures and the cesium revaporization inside the reactor pressure vessel, 1; Basic concepts and model descriptions for the Fukushima Daiichi Nuclear Power Plant

Liu, Q.; Ishikawa, Jun; Maruyama, Yu; Watanabe, Norio

Journal of Nuclear Science and Technology, 49(5), p.479 - 485, 2012/05

 Times Cited Count:2 Percentile:77.56(Nuclear Science & Technology)

This paper presents a simple approach for estimating the temperature of the structures in the reactor pressure vessel (RPV) and the release rates of fission products (FPs) at the time of several months after the core melt accident at the Fukushima Daiichi Nuclear Power Plant. In this paper, basic concepts are firstly presented and then, a heat balance model is proposed to estimate the temperature of the uncovered reactor core and the upper structures in the RPV with the measured temperatures of the RPV outer wall. In addition, models for estimating the revaporization rate of cesium hydroxide (CsOH) inside the RPV and the leak rate of CsOH to the primary containment vessel are also presented. This approach is anticipated to be applicable to the Fukushima Daiichi #1, #2 and #3 Units.

Journal Articles

A Simple method for estimating the structure temperatures and the cesium revaporization inside the reactor pressure vessel, 2; Feasibility study for the Fukushima Daiichi Nuclear Power Plant

Liu, Q.; Ishikawa, Jun; Maruyama, Yu; Watanabe, Norio

Journal of Nuclear Science and Technology, 49(5), p.486 - 495, 2012/05

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

This work examines the feasibility of the method proposed in the preceding part of a two-part paper. The base case study shows that water injection via the core spray line is more effective to cool the uncovered core and to reduce the release of CsOH. Sensitivity study is conducted by introducing the dimensionless decay heat, which combines the effects of the ratio of the flooded core, the ratio of the slumped core and the leak ratio of the injected water on the steam generation rate associated with the forced convection cooling in the reactor pressure vessel (RPV). The results show that the temperatures of the uncovered core and the other structures increase with the dimensionless decay heat. So does the release rate of CsOH. The relationships of the measurable RPV wall temperature with the temperatures of the uncovered core and the other structures as well as the release characteristics of CsOH are also examined in this work.

Journal Articles

Signature inversion in the 7/2$$^-$$[503] band of $$^{185}$$Pt

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

 Times Cited Count:1 Percentile:86.72(Physics, Nuclear)

High-spin states in $$^{185}$$Pt have been investigated by means of in beam $$gamma$$-ray spectroscopic method at the JAEA tandem facility. Low-spin signature inversion is revealed in the 7/2$$^-$$[503] band. The inversion can be interpreted as a configuration change from the 7/2$$^-$$[503] orbital to the 7/2$$^-$$[514] orbital with increasing spin, which is supported by a theoretical calculation of the semi-classical Donau and Frauendorf approach.

Journal Articles

Li(Zn,Mn)As as a new generation ferromagnet based on a I-II-V semiconductor

Deng, Z.*; Jin, C. Q.*; Liu, Q. Q.*; Wang, X. C.*; Zhu, J. L.*; Feng, S. M.*; Chen, L. C.*; Yu, R. C.*; Arguello, C.*; Goko, Tatsuo*; et al.

Nature Communications (Internet), 2, p.1425_1 - 1425_5, 2011/08

 Times Cited Count:118 Percentile:6.04(Multidisciplinary Sciences)

In a prototypical ferromagnet (Ga,Mn)As based on a III-V semiconductor, substitution of divalent Mn atoms into trivalent Ga sites leads to severely limited chemical solubility and metastable specimens available only as thin films. The doping of hole carriers via (Ga,Mn) substitution also prohibits electron doping. To overcome these difficulties, Masek et al. theoretically proposed systems based on a I-II-V semiconductor LiZnAs, where isovalent (Zn,Mn) substitution is decoupled from carrier doping with excess/deficient Li concentrations. Here we show successful synthesis of Li$$_{1+y}$$(Zn$$_{1-x}$$Mn$$_x$$)As in bulk materials. We reported that ferromagnetism with a critical temperature of up to 50 K is observed in nominally Li-excess compounds, which have p-type carriers.

Journal Articles

Sensitivity analysis based on the FAST method

Liu, Q.

Opereshonzu, Risachi, 55(10), p.622 - 626, 2010/10

FAST (Fourier Amplitude Sensitivity Test) is the earliest global sensitivity analysis method aiming at quantifying the contribution of the uncertainties in the model inputs to the uncertainty in the model output. The mechanism of FAST is to assign each model input with a characteristic frequency through a periodic search function. Then, for a specific model input, its contribution to the variance of the model output can be singled out by the characteristic frequency based on fourier analysis. FAST is computationally very efficient and is used widespread nowadays. In this work, the theory and the computational method of FAST are described in detail. It is hoped that this work will promote the application of FAST in the field of decision-making under uncertainty.

JAEA Reports

GSALab computer code for global sensitivity analysis

Liu, Q.; Homma, Toshimitsu; Nishimaki, Yuichiro*; Hayashi, Hiroko*; Terakado, Masato*; Tamura, Satoshi*

JAEA-Data/Code 2010-001, 57 Pages, 2010/03


For a risk assessment model of an engineering system, the uncertainties in the model inputs propagate through the model and lead to the uncertainty in the model output. In order to evaluate the model output uncertainty and the contribution of each model input to the output uncertainty, the computer code GSALab, which is based on Monte Carlo simulations, has been developed. It is composed of three parts, namely, random samples generation, uncertainty analysis and sensitivity analysis. In the part of sensitivity analysis, several global sensitivity indicators, including the popularly used variance-based indicators, are implemented. In addition, the GUI (Graphical User Interface) of GSALab has been developed for the user's convenience. In addition to risk assessment models, it is also possible to use GSALab for uncertainty and sensitivity analysis of a wide class of mathematical models.

Journal Articles

A New importance measure for sensitivity analysis

Liu, Q.; Homma, Toshimitsu

Journal of Nuclear Science and Technology, 47(1), p.53 - 61, 2010/01

 Times Cited Count:49 Percentile:3.14(Nuclear Science & Technology)

One issue that can not be ignored in risk assessment is the existence of uncertainties of the model output. An uncertainty importance measure is an index aiming at identifying the contribution of uncertain input parameters to output uncertainty. Up till now, many kinds of importance measure have been proposed, such as mean-based measure, variance-based measure. By analyzing the merits and shortcomings of these measures, the authors proposed a new importance measure, which evaluates the influence of the entire range of input distribution on the entire range of output distribution. A Monte Carlo based computational method is put forward to estimate this new measure. Taking two test models as the examples, the authors proved that the calculation results of this new measure is stable and this new measure is easy to compute.

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