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Oral presentation

Introduction

Narumi, Kazumasa

no journal, , 

no abstracts in English

Oral presentation

Field-induced incommensurate order in the distorted diamond chain

Sakai, Toru; Tonegawa, Takashi*; Okamoto, Kiyomi*

no journal, , 

The S=1/2 distorted diamond chain is investigated by the density matrix renormalization group and the numerical exact diagonalization. We found that an incommensurate long-range order is induced by the external magnetic field above the 1/3 magnetization plateau. We using this result theoretically explain the field induced incommensurate order observed in the azurite.

Oral presentation

Effects of electron-phonon interaction in quantum-dot systems

Onishi, Hiroaki; Dagotto, E.*

no journal, , 

no abstracts in English

Oral presentation

An Analysis of EUV spectra emitted from highly-charged tungsten ions in JT-60U high-temperature plasmas

Yanagibayashi, Jun; Nakano, Tomohide; Hasuo, Masahiro*; Iwamae, Atsushi; Kubo, Hirotaka; Itami, Kiyoshi

no journal, , 

Tungsten is one of the candidates for the divertor material of ITER because of its low retention and low hydrogen inventory. However, it is a problem that tungsten ions accumulated in a core plasma emit intense radiation and cool the plasma. For preparation of investigating the mechanism of the tungsten ion accumulation, Vaccum Ultra Violet (VUV) lines emitted from tungsten ions are identified. A VUV spectrum from a JT-60U plasma ($$T_{e} sim 6$$ keV) is observed with a flat-field grazing-incidence spectrometer. The observed spectrum is compared with a theoretical spectrum calculated with Flexible Atomic Code. It is found that the observed peaks around 3 nm are due to transitions between $$n = 3$$ levels of W$$^{q+}$$ ($$47 le q le 53$$), and that those around 5, 6 and 13 nm are due to transitions between $$n = 4$$ levels of W$$^{q+}$$ ($$41 le q le 45$$). It is believed that the former lines are useful to diagnose the tungsten ion accumulation in a high-temperature ($$T$$$$_{e}$$ $$>$$ 10 keV) plasma of ITER.

Oral presentation

Low temperature structure of FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$ magnetic superconductor

Mochiku, Takashi*; Hata, Yoshiaki*; Tuerxun, W.*; Igawa, Naoki; Hoshikawa, Akinori*; Ishigaki, Toru*; Yasuoka, Hiroshi*; Hirata, Kazuto*

no journal, , 

FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$ is known as the Ba$$_{2}$$YCu$$_{3}$$O$$_{6+delta}$$ related super conducting compound with the substitution of the Fe for Cu, only when it is annealed in reduced atmosphere and subsequently in oxidized atmosphere. In this study, we have performed neutron powder diffraction of FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$ to investigate the magnetic disorder-ordering mechanism. No magnetic reflection was observed even below the magnetic transition temperature. This result indicated that the material has not long-range magnetic-ordering.

Oral presentation

First-order transition at upper critical field in NpPd$$_5$$Al$$_2$$ superconductor, 2

Haga, Yoshinori; Homma, Yoshiya*; Matsuda, Tatsuma; Tateiwa, Naoyuki; Aoki, Dai*; Onuki, Yoshichika

no journal, , 

no abstracts in English

Oral presentation

Effects of $$bar K$$ - $$bar K$$ interaction on the multi-Kaonic nuclei

Muto, Takumi*; Maruyama, Toshiki; Tatsumi, Toshitaka*

no journal, , 

no abstracts in English

Oral presentation

A Multi-step magnetization process of CsFeCl$$_3$$

Inami, Toshiya

no journal, , 

no abstracts in English

Oral presentation

Photon scattering experiments on nuclei at iron region using a $$gamma$$-ray beam from inverse Compton scattering

Shizuma, Toshiyuki; Hayakawa, Takehito; Kikuzawa, Nobuhiro; Ogaki, Hideaki*; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*

no journal, , 

no abstracts in English

Oral presentation

Observation of temperature dependence of charge excitation spectra in Sr$$_{14-x}$$Ca$$_x$$Cu$$_{24}$$O$$_{41}$$ ($$x$$ = 0, 6) by resonant inelastic X-ray scattering

Yoshida, Masahiro; Ishii, Kenji; Jarrige, I.; Ikeuchi, Kazuhiko; Murakami, Yoichi*; Mizuki, Junichiro; Tsutsui, Kenji; Toyama, Takami*; Maekawa, Sadamichi*; Kudo, Kazutaka*; et al.

no journal, , 

no abstracts in English

Oral presentation

Shell and nuclear structure in unstable nuclei over N=28

Utsuno, Yutaka; Otsuka, Takaharu*; Brown, B. A.*; Homma, Michio*; Mizusaki, Takahiro*

no journal, , 

no abstracts in English

Oral presentation

A Guiding-centre fundamental 1-form with strong E$$times$$B flow

Miyato, Naoaki; Scott, B. D.*; Strintzi, D.*; Tokuda, Shinji

no journal, , 

A guiding-centre fundamental 1-form whose symplectic part does not include the E$$times$$B 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 E$$times$$B 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.

Oral presentation

Nuclear liquid drop model revisited

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, $$A< 50$$) is larger than that of heavier nuclei.

Oral presentation

Development and application of high-pressure technique for single-crystal magnetic neutron diffraction under 10 GPa

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$$_{2}$$C$$_{2}$$ (R=Dy, Ho) up to 9 GPa with the modified hybrid-anvil device.

Oral presentation

Chopper-type neutron inelastic spectrometer 4SEASONS at MLF, J-PARC

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

Oral presentation

IR spectroscopy of a protein in a reverse micelle

Murakami, Hiroshi; Nishi, Takaki; Toyota, Yuji

no journal, , 

no abstracts in English

Oral presentation

Local structure analysis of BiFeO$$_3$$-BaTiO$$_3$$ solid solution

Yoneda, Yasuhiro; Yoshii, Kenji; Mori, Shigeo*

no journal, , 

Local structure analysis of 0.75BiFeO$$_3$$-0.25BaTiO$$_3$$ 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$$^circ$$C. The 0.75BiFeO$$_3$$-0.25BaTiO$$_3$$ occurred two phase transitions. The average structure of changed from low-temperature rhombohedral structure to pseudo-cubic structure at 500$$^circ$$C, but the local structure unchanged. The local structure changed at second phase transition from pseudo cubic structure to cubic structure at 800$$circ$$C. The local structure of the pseudo-cubic phase can be reproduced not by the average cubic structure but by the distorted rhombohedral structure.

Oral presentation

AMATERAS; A Cold-neutron disk-chopper spectrometer

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

Oral presentation

A Magnetic multiplet lens for pulsed neutron beam focusing

Oku, Takayuki; Kira, Hiroshi; Shinohara, Takenao; Takata, Shinichi; Arai, Masatoshi; Suzuki, Junichi

no journal, , 

no abstracts in English

Oral presentation

Study of hydration structure of palladium(II) ion via first principles molecular dynamics

Ikeda, Takashi

no journal, , 

no abstracts in English

106 (Records 1-20 displayed on this page)