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Utsuno, Yutaka; Otsuka, Takaharu*; Brown, B. A.*; Homma, Michio*; Mizusaki, Takahiro*
no journal, ,
no abstracts in English
B flowMiyato, Naoaki; Scott, B. D.*; Strintzi, D.*; Tokuda, Shinji
no journal, ,
A guiding-centre fundamental 1-form whose symplectic part does not include the EB term is derived by the Lie-transform perturbation method. Since the symplectic part of the derived 1-form is the same as the standard one without the strong EB flow formally, it yields the standard Lagrange and Poisson brackets. Therefore the guiding-centre Hamilton equations also keep the standard form. The guiding-centre Hamiltonian is rather complicated compared to the previous ones. However, it is possible to simplify the Hamiltonian in localised transport barrier region like the tokamak H-mode edge.
Oyamatsu, Kazuhiro*; Iida, Kei*; Koura, Hiroyuki
no journal, ,
Liquid drop model is a representative model to describe binding energy and size of nuclei. This model is well reproduces bulk properties of nuclei even in current studies on nuclei. In this presentation, we investigate nuclear symmetry energy and nuclear surface energy by using the nuclear liquid drop model with some higher-order terms. The coefficients of these term are determined so as to reproduce measured nuclear masses of approximately 2200 nuclides. From this analysis we find an indication that the fourth-order terms of the symmetry energy is required and the curvature term of it is negligible. Regarding a mass-number dependency on nuclear radius, we also find that the dependency of lighter nuclei (typically with mass number, 
) is larger than that of heavier nuclei.
Osakabe, Toyotaka; Yamauchi, Hiroki
no journal, ,
We have developed a hybrid-anvil high-pressure device for single-crystal magnetic neutron diffraction beyond 3 GPa. The device consists of an opposed pair of an upper sapphire anvil and a lower WC anvil. Maximum pressure generated by the device is 7 GPa. To increase the maximum pressure up to 10 GPa, we tried three types of the lower anvil instead of the simple sapphire anvil. One is a sapphire anvil with a thin diamond cap, another is a sapphire anvil supported by a MP35 alloy, and the other is a SiC anvil supported by a MP35 alloy. We found that the modified hybrid-anvil, that is, the combination of the WC anvil and the supported SiC anvil could generate the pressure of 10 GPa at the load of 3.8 tons. The size of the sample chamber under 10 GPa was about 1 mm diameter and 0.25 mm height, which is sufficient for magnetic neutron diffraction experiments. We succeed in the magnetic neutron diffraction experiments on the RB
C (R=Dy, Ho) up to 9 GPa with the modified hybrid-anvil device.
Kajimoto, Ryoichi; Yokoo, Tetsuya*; Nakamura, Mitsutaka; Nakajima, Kenji; Inamura, Yasuhiro; Takahashi, Nobuaki; Maruyama, Ryuji; Soyama, Kazuhiko; Mizuno, Fumio; Shibata, Kaoru; et al.
no journal, ,
no abstracts in English
Murakami, Hiroshi; Nishi, Takaki; Toyota, Yuji
no journal, ,
no abstracts in English
Ikeda, Takashi
no journal, ,
no abstracts in English
-BaTiO solid solutionYoneda, Yasuhiro; Yoshii, Kenji; Mori, Shigeo*
no journal, ,
Local structure analysis of 0.75BiFeO-0.25BaTiO solid solution was carried out by a synchrotron radiation X-ray pair-distribution function (PDF) method with the temperature range from room temperature to 900
C. The 0.75BiFeO-0.25BaTiO occurred two phase transitions. The average structure of changed from low-temperature rhombohedral structure to pseudo-cubic structure at 500C, but the local structure unchanged. The local structure changed at second phase transition from pseudo cubic structure to cubic structure at 800
C. The local structure of the pseudo-cubic phase can be reproduced not by the average cubic structure but by the distorted rhombohedral structure.
Nakajima, Kenji; Kawamura, Seiko; Kajimoto, Ryoichi; Inamura, Yasuhiro; Takahashi, Nobuaki; Osakabe, Toyotaka; Wakimoto, Shuichi; Nakamura, Mitsutaka; Ito, Shinichi*; Aizawa, Kazuya; et al.
no journal, ,
no abstracts in English
Yamazaki, Dai; Maruyama, Ryuji; Soyama, Kazuhiko; Takai, Hiroyuki*; Nagai, Mikinori*; Yamamura, Kazuya*
no journal, ,
no abstracts in English
O
Komatsu, Takuma*; Kambe, Takashi*; Michiuchi, Takamasa*; Hayakawa, Hironori*; Oishi, Daisuke*; Hanasaki, Noriaki*; Ikeda, Naoshi*; Yoshii, Kenji
no journal, ,
LuFeO is a ferroelectric material arising from the real-space ordering of Fe charges below 330 K. In this paper, we measured the magnetic-field dependence of dielectric response in this material. We report a change of dielectric constant depending on the measurement temperature and applied magnetic field.
Watanuki, Tetsu; Kawana, Daichi; Machida, Akihiko; Tsai, A. P.*
no journal, ,
no abstracts in English
Machida, Akihiko; Watanuki, Tetsu; Kawana, Daichi; Aoki, Katsutoshi
no journal, ,
We have investigated the structural properties of rare-earth metal hydrides by using synchrotron radiation X-ray diffraction experiments under high pressure. Rare-earth metal di-hydrides generally exhibit the fcc metal lattice, which contains hydrogen atoms in only tetrahedral interstitial sites. It is expected that the hydrogen atoms transfer to another interstitial site by compression of metal lattice. We found the pressure-induced phase separation of yttrium di-hydride and lanthanum di-hydride under high pressure. The appearance of the secondary phase with 
17% small metal lattice indicates the disproportionation reaction into two different hydrogen concentration.
Ishii, Yasutomo; Smolyakov, A. I.*
no journal, ,
no abstracts in English
-vector in Sr
RuO
Nomura, Takuji; Ikeda, Hiroaki*
no journal, ,
Anisotropy of -vector in a spin-triplet superconductor SrRuO is discussed, by solving the linearized Eliashberg equation for a multi-band Hubbard model and a dp-model. Here the effective pairing interaction is calculated by expanding perturbatively to third order in the onsite Coulomb interaction. It is shown that the Eu state (
) is stabilized in the case of small spin-orbit interaction, consistent with experimental results.
Iijima, Hokuto; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi; Honda, Yosuke*; Muto, Toshiya*
no journal, ,
no abstracts in English
Hirota, Makoto; Tokuda, Shinji
no journal, ,
Resonant damping of an eigenmode, caused by such as the Alfv
n resonance and the wave-particle interaction, is an important phenomenon in both fusion and astrophysical plasmas. In this work, the wave actions of eigenmodes and continuum modes are formulated. Their invariance (i.e., the adiabatic invariance) is shown to be useful for the estimation of resonant damping.
Tokuda, Shinji; Shiraishi, Junya; Kagei, Yasuhiro*
no journal, ,
no abstracts in English
Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
We have developed a positron microprobe apparatus and also applied it for the research of the nuclear materials. Although the Doppler-broadening measurement was possible using continuous positron beam, positron lifetime annihilation measurement can be carried out using pulsed positron beam formed by a pulsing system which is inserting in the beam line. From the performance test, pulse width of approximately 150ps was confirmed. It was also confirmed that a difference of the lifetime of stainless steel and silicone was detectable. Moreover, our apparatus can be utilized also as a usual scanning electron microscope using the electron gun equipped on the beam port. The complex research using a positron and an electron beam might be possible.
Sugai, Takashi; Haga, Yoshinori; Matsuda, Tatsuma; Yamamoto, Etsuji; Tateiwa, Naoyuki
no journal, ,
no abstracts in English