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Onishi, Hiroaki
no journal, ,
no abstracts in English
Kai, Takeshi; Yonetani, Yoshiteru*; Yokoya, Akinari*
no journal, ,
Deeply study for radiation DNA damage is very important to understand initial factors for mutation and cancer inductions. Recently, photolysis techniques have revealed that pre-hydrated electrons can induce DNA damage through dissociative electron transfer (DET). The contributions to DNA damage by DET have not been fully investigated in previous theoretical studies. Thus a dynamic Monte Carlo code (DMCC) was developed to consider effect of the DET. From the analysis used by the DMCC, we revealed that pre-hydrated electrons contribute to formation of complex DNA damage. Thus we also have developed a newly calculation method combined with the DMCC and molecular dynamics method. The method makes it possible to predict formation of pre-hydrated electrons. In this presentation, we will report current states of development for the newly method.
Ge
, 2Haga, Yoshinori; Matsumoto, Yuji*; Tateiwa, Naoyuki; Yamamoto, Etsuji; Nakamura, Ai*; Honda, Fuminori*; Aoki, Dai*; Yamagami, Hiroshi*
no journal, ,
no abstracts in English
Np isomerKamada, Hiroki*; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Toyoshima, Atsushi; Nagame, Yuichiro; Mitsukai, Akina; Tomitsuka, Tomohiro*; Andreyev, A. N.; Nishio, Katsuhisa; et al.
no journal, ,
Existence of the previously unknown isomer Np was discovered for the first time. Np was produced by using the JAEA tandem accelerator. Short-lived reaction products were mass-separated by the on-line isotope separator ISOL, and 
and X rays originating from the decay of Np were observed. The half-life of Np was determined to be approximately 9 min, and Np was found to decay via the EC decay as well as the isomeric transition. On the basis of the observed and X rays and the half-life value, we have evaluated level energy, spin-parity, and proton-neutron configuration of Np.
Al
studied by three dimensional ARPESFujimori, Shinichi; Kobata, Masaaki; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*
no journal, ,
no abstracts in English
Kumada, Takayuki; Akutsu, Kazuhiro*; Oishi, Kazuki*; Morikawa, Toshiaki*; Kawamura, Yukihiko*; Sahara, Masae*; Suzuki, Junichi*; Torikai, Naoya*
no journal, ,
We have developed a technique of spin contrast variation neutron reflectometry (SCV-NR). The reflectivity curve of the polarized neutrons nonsimilarly varies as a function of proton polarization PH of a polymer thin film on silicon substrate. The PH-dependent reflectivity curve determines the roughnesses of the surface and interface of the polymer thin film, whereas single reflection curve of non-polarized neutrons cannot determine uniquely. We consider that the SCV-NR would be a promising technique to determine surface and interface structure of thin films of soft materials.
SR studies on Ln(O
F
)BiS (Ln=Ce,Nd) under a magnetic fieldHigemoto, Wataru; Ito, Takashi; Ooshima, Kohei; Okazawa, Takeshi*; Tomono, Dai*; Mihara, Mototsugu*; Mita, Masaaki*; Higashinaka, Ryuji*; Matsuda, Tatsuma*; Aoki, Yuji*
no journal, ,
no abstracts in English
Idomura, Yasuhiro
no journal, ,
Transient plasma responses due to modulated electron heating are investigated in numerical experiments of ion temperature gradient driven trapped electron mode turbulence using gyrokinetic full-f Eulerian code GT5D. It is found that even with electron heating without particle and momentum sources such as electron cyclotron resonance heating, dominant turbulence is changed from ion turbulence to electron turbulence due to changes of the electron temperature gradient and the temperature ratio, and the resulting turbulent transport produces responses of density and rotation profiles.
Matsuoka, Seikichi; Idomura, Yasuhiro; Honda, Mitsuru*; Satake, Shinsuke*; Suzuki, Yasuhiro*
no journal, ,
Effects of three-dimensional magnetic perturbation arising from e.g. error fields due to the imperfect coil manufacturing and installations, have attracted much attention in transport studies in axisymmetric tokamak plasmas. In this work, we performed global full-f gyrokinetic simulations for a JT-60U equilibrium which involve the three-dimensional perturbation by using experimental equilibrium version of a global full-f gyrokinetic simulation code, GT5D. Quantitative agreement of the neoclassical transport and the ambipolar radial electric field between GT5D and the existing couple analysis model is confirmed. And it is also confirmed that the neoclassical toroidal viscosity induced by the perturbation shows qualitative agreement with the couple analysis model. Furthermore, the numerical cost for the experimental analysis can be greatly reduced by using GT5D.
under high pressureTateiwa, Naoyuki; Haga, Yoshinori; Yamamoto, Etsuji
no journal, ,
We have measured the dc-magnetization of uranium ferromagnet UGe under high pressure using a miniature ceramic anvil high pressure cell. In UGe, the superconductivity appears from 1.0 GPa to a critical pressure for the ferromagnetism 1.6 GPa. The origin of the superconductivity has not been understood. There are two ferromagnetic phases FM1 and FM2 in the ferromagnetic phase. The ground state is changed from FM2 to FM1 at a critical pressure 
1.2 GPa. We measured the magnetic data and the data has been analyzed with the spin fluctuation theory. We found that the characteristic energy of the spin fluctuation 
shows a anomalous behaviors around 
and strong correlation between and the superconducting transition temperature 
.
ion source upon the extracted beamShinto, Katsuhiro
no journal, ,
no abstracts in English
Metoki, Naoto; Yamauchi, Hiroki; Matsuda, Masaaki*; Fernandez Baca, J.*; Yoshida, Masahiro*; Yoshizawa, Hideki*; Hagihara, Masato*; Watanuki, Ryuta*
no journal, ,
We report the magnetic structures and propose the mechanism of the successive transition based on the 
-electron state revealed by CEF excitation. We confirmed the non-collinear `all-in all-out' structure (
) of the in-plane moment. We found that the magnetic moment along the 
-axis 
showed diagonally antiferromagnetic structure (
). The unusual magnetic ordering is phenomenologically understood via Landau theory. We also found that a long-period incommensurate modulation of the (
) antiferromagnetic structure of with the propagation 
= (0.14, 0.14, 0.1) and 
= (0.2, 0, 0.1) in phase III and IV, respectively. We found pseudo-quartet -electron state based on 
and 
. We can propose the intermediated phase as the magnetically ordered phase of 
while 
and 
coupling phase tabilized in low temperatures.
SiKambe, Shinsaku; Hattori, Taisuke; Sakai, Hironori; Tokunaga, Yo; Matsuda, Tatsuma*; Haga, Yoshinori; Walstedt, R. E.*
no journal, ,
High quality YbRh
Si was prepared by concentrating the 
Si isotope which is the NMR nucleus by 52%. Since the natural abundance ratio of Si isotope is about 4%, this concentration can shorten the measured integrated time to about one hundredth. Using this single crystal sample, NMR spin echo attenuation was measured. In the decay curve, in addition to ordinary Gauss type and Lorentz type attenuation, clear vibration term appeared. This is thought to be due to RK interaction and quasi-dipolar interaction. A large temperature change was also observed in this frequency at low temperature. This means that the Fermi surface is temperature dependent. Discuss these behaviors.
using soft X-ray magnetic circular dichroismTakeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Yamagami, Hiroshi; Yamamoto, Etsuji; Haga, Yoshinori
no journal, ,
no abstracts in English
Fe
O
Shamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Matsuura, Masato*; Akatsu, Mitsuhiro*; Nakamura, Mitsutaka; Inamura, Yasuhiro; Kodama, Katsuaki; Kawamura, Seiko; Nemoto, Yuichi*; et al.
no journal, ,
no abstracts in English
Koura, Hiroyuki
no journal, ,
no abstracts in English
O (R: rare earths)Yoshii, Kenji; Nomura, Takuji*; Ikeda, Naoshi*
no journal, ,
The rare-earth iron system RFeO shows ferroelectricity due to charge ordering of iron ions below 330 K. Also, the iron spins shows ferrimagnetism below 250 K and thus becomes multiferroic. Although this system was discovered almost a decade ago, its detailed properties remain unclear. In this study, we have calculated its ground state based on mean-field approximation. Various charge-ordered states have been observed. However, a ferroelectric state was not most stable. This suggests that the ferroelectricity is governed by the other factors such as lattice distortion.
nanocrystalsYoneda, Yasuhiro; Kunisada, Ryoichi*; Chikada, Tsukasa*; Ueno, Shintaro*; Fujii, Ichiro*; Wada, Satoshi*
no journal, ,
High-energy X-ray diffraction measurements were performed to analyze KNbO nanocrystals. We used KNbO nanocrystals with cubic shape. Moreover, these nanocrystals have cubic structure owing to their small crystal size. Therefore, these nanocrystals are ideal for applying the Scherrer's equation. Crystal-growth mechanism was considered with the crystal size obtained by the Scherrer's equation. It was found the growth mechanism of KNbO by comparing the crystal size and average structure obtained by Rietveld analysis and coherent size obtained by atomic pair-distribution function method.
Nagai, Yuki; Shen, H.*; Qi, Y.*; Liu, J.*; Fu, L.*
no journal, ,
no abstracts in English
Mamiya, Hiroaki*; Oba, Yojiro; Terada, Noriki*; Watanabe, Norimichi*; Hiroi, Kosuke; Shinohara, Takenao; Oikawa, Kenichi
no journal, ,
no abstracts in English