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Moribayashi, Kengo
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no abstracts in English
by using a soft X-ray emission spectroscopyMizumaki, Masaichiro*; Agui, Akane; Uozumi, Takayuki*; Ichikawa, Noriya*; Shimakawa, Yuichi*
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(M=Mn, Fe, Co, and Ni) studied by the Ti2p-edge X-ray emission spectroscopyAgui, Akane; Mizumaki, Masaichiro*; Uozumi, Takayuki*
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Otobe, Tomohito; Yabana, Kazuhiro*
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We present the first-principles description for the non-linear excitation in dielectrics induced by an optical field and would like to present the new approach to probe electron excitation process. We rely upon the time-dependent density-functional theory with the adiabatic local-density approximation, and a real-space and real-time method is employed to solve the time-dependent Kohn-Sham equation. We distinguish the high harmonic generation by electron-hole recombination by Fourier transformation of electronic current after laser filed ends. We find the spectrum of this electric field presents the detail of the electron excitation process, multi-photon absorption and tunnel effect.
Shinohara, Yasushi; Otobe, Tomohito; Yabana, Kazuhiro*
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Under intense pulse electric field causing Zener tunneling through valence band to conduction band in dielectrics, excitation profile may depend on Carrier-Envelope-Phase (CEP) of irradiating laser pulse. Especially in solids, what physical quantities reveal changing respect to CEP are not understood sufficiently. We calculate model system that is one-dimensional periodic system under intense half-cycle laser pulse. In our calculation, the system show DC current changed respect to CEP. If we observe the DC current, we can observe ultrafast light-dielectrics interaction. In this talk, we report the results of our calculation and how such phenomenon is understood.
Nishimori, Nobuyuki; Nagai, Ryoji; Hajima, Ryoichi; Yamamoto, Masahiro*; Miyajima, Tsukasa*; Honda, Yosuke*; Kuriki, Masao*; Iijima, Hokuto*; Kuwahara, Makoto*; Okumi, Shoji*; et al.
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Kotaki, Hideyuki; Hayashi, Yukio; Kawase, Keigo*; Mori, Michiaki; Kando, Masaki; Koga, J. K.; Bulanov, S. V.
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Shiraishi, Junya; Tokuda, Shinji*
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Okamoto, Minoru*; Maruyama, Toshiki; Yabana, Kazuhiro*; Tatsumi, Toshitaka*
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Muto, Takumi*; Maruyama, Toshiki; Tatsumi, Toshitaka*
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Hashimoto, Shintaro; Ogata, Kazuyuki*; Chiba, Satoshi; Yahiro, Masanobu*
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states in even-even actinide nucleiAsai, Masato; Tsukada, Kazuaki; Kasamatsu, Yoshitaka*; Toyoshima, Atsushi; Sato, Tetsuya; Nagame, Yuichiro; Sato, Nozomi; Ishii, Tetsuro
no journal, ,
Energies of the first-excited states in even-even actinide nuclei were determined precisely through high-resolution 
-particle measurements and -
coincidence measurements. Those energies were measured for a total of 8 isotopes in Pu, Cm, Cf and Fm, and dependences of those energies on the proton and neutron numbers were systematically clarified. It was found that the energy of the first-excited state takes the minimum around Cm and Cf isotopes, and increases with increasing atomic number. This trend was qualitatively explained by taking account of the existence of the spherical closed shell at the proton number 
.
Koizumi, Mitsuo; Matsuki, Seishi*; Goto, Jun*; Nakamura, Shoji
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Utsuno, Yutaka
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Sotani, Hajime*; Yasutake, Nobutoshi*; Maruyama, Toshiki; Tatsumi, Toshitaka*
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Onishi, Hiroaki
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no abstracts in English
Sato, Shinichiro; Sai, Hitoshi*; Oshima, Takeshi; Imaizumi, Mitsuru*; Shimazaki, Kazunori*; Kondo, Michio*
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Maruta, Tomofumi; Kikuzawa, Nobuhiro; Sako, Hiroyuki; Miura, Akihiko
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Japan Proton Accelerator Research Complex (J-PARC) is a high intensity proton accelerator facility in Japan. Since it will reach to 100 times higher beam intensity than KEK-PS. it is quite important to suppress radioactivation of beamline component as low as possible in order to keep easiness of hand maintenance. We suppose most of the ratioactivation comes from the scattering of beam particle with residual gas inside beam duct, a simulation based on the physical quantities such as cross-section is necessary to study on the loss. Now I'm developing a Geant4 simulation tool for the beamloss study. In this presentation, I will show the present status of the study.
Ninomiya, Kazuhiko; Ito, Takashi; Higemoto, Wataru; Strasser, P.*; Kawamura, Naritoshi*; Shimomura, Koichiro*; Miyake, Yasuhiro*; Miura, Taichi*; Kita, Makoto*; Shinohara, Atsushi*; et al.
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A muonic atom is an atomic system that has one negatively charged muon instead of an electron. There are many studies related to the formation process of muonic atom by measuring muon characteristic X-rays. It is known that muon characteristic X-ray intensities are influenced by the density of the sample itself. However, most of previous studies did not consider this effect. In this study, we measured muon characteristic X-rays for dinitrogen mono-oxide with 0.1-1.0 atm. The same muonic X-ray intensities were obtained below 0.2 atm condition. This result means the density effect is neglectable below 0.2 atm for dinitrogen mono-oxide gas.
Iwata, Yoshihiro; Harano, Hideki*; Ito, Chikara; Aoyama, Takafumi
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no abstracts in English