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Hosaka, Koichi; Itakura, Ryuji; Yokoyama, Keiichi; Yamanouchi, Kaoru*; Yokoyama, Atsushi
no journal, ,
In intense laser fields, molecules are decomposed into fragments through a number of competing dissociative ionization pathways. We have investigated the dissociative ionization dynamics of ethanol in intense laser fields with photoelectron-photoion coincidence momentum imaging. The fragment momentum specific photoelectron images reveal the correlation between the electronic states prepared just after ionization and the following dissociation dynamics of ethanol cation.
Sato, Shinichiro; Sai, Hitoshi*; Imaizumi, Mitsuru*; Shimazaki, Kazunori*; Kondo, Michio*; Oshima, Takeshi
no journal, ,
no abstracts in English
Moribayashi, Kengo
no journal, ,
no abstracts in English
Ochi, Yoshihiro; Terakawa, Kota*; Suemoto, Toru*; Kawachi, Tetsuya; Hasegawa, Noboru; Tomita, Takuro*; Yamamoto, Minoru*; Deki, Manato*; Oba, Toshiyuki; Kaihori, Takeshi
no journal, ,
We developed a soft X-ray laser interferometer dedicated to the solid state physics. The interferometer enabled us to observe dynamical changes on the solid surface such as the photo-induced phase transition with picoseconds temporal resolution and nanometer special resolution (in z-axis). We carried out a performance test using static test pattern and confirmed the performance.
Kaneko, Koji; Metoki, Naoto; Takeuchi, Tetsuya*; Matsuda, Tatsuma; Haga, Yoshinori; Thamizhavel, A.*; Settai, Rikio*; Onuki, Yoshichika
no journal, ,
We report neutron diffraction studies on non-centrosymmetric compound CeCoGe with the BaNiSn-type structure. Upon cooling down the temperature, emergence of the 1,0,1/3 magnetic reflection was found below 20,K. The 1,0,/4 reflection appears below 8,K substituting 1,0,1/3, and finally 1,0,,1/2 reflection appears below 5.3,K. This result indicates that the multi-step transition in CeCoGe is the change of the periodicity along the c-axis.
Ikeda, Takashi; Boero, M.*; Huang, S.-F.*; Terakura, Kiyoyuki*; Oshima, Masaharu*; Ozaki, Junichi*; Miyata, Seizo*
no journal, ,
no abstracts in English
Sakai, Toru; Okunishi, Koichi*; Okamoto, Kiyomi*; Itoi, Chigaku*; Sato, Masahiro*
no journal, ,
no abstracts in English
Kambe, Shinsaku; Tokunaga, Yo; Sakai, Hironori; Chudo, Hiroyuki; Matsuda, Tatsuma; Yasuoka, Hiroshi; Haga, Yoshinori; Onuki, Yoshichika
no journal, ,
The anisotropy and T-dependence of hyperfine interaction in f-electron 115 compounds cannot be explained by usual transferred hyperfine coupling. We have consider the origin of this anomaly based on the RKKY interaction.
Shibata, Takemasa; Ogura, Koichi; Koike, Fumihiro*
no journal, ,
Symmetric charge transfer of gadolinium(atom:4f
5d6s
,ion4f5d6s) has two reaction paths which are resonant and non-resonant due to open 4f5d electrons inside 6s electrons. Formerly, we calculated the cross sections of symmetric charge transfer of gadolinium by assuming that the resonant and non-resonant reactions proceed independently in proportion to their statistical weights. However, this assumption is not correct because there are transitions between the resonant and non-resonant states. In the present paper the cross sections were calculated by solving the coupled equations considering couplings among all resonant and non-resonant states in the impact-parameter method. It is found that the cross sections are much larger than those calculated on the assumption of the independence of the resonant and non-resonant reactions and a little small compared with the usual symmetric resonance charge transfer.
B
O
(B=Ti,V,Cr)Saito, Takashi*; Lon, Y.*; Mizumaki, Masaichiro*; Agui, Akane; Shimakawa, Yuichi*
no journal, ,
no abstracts in English
by X-ray spectroscopyMizumaki, Masaichiro*; Taguchi, Munetaka*; Agui, Akane; Kawamura, Naomi*; Tassel, C.*; Tsujimoto, Yoshihiro*; Kageyama, Hiroshi*
no journal, ,
no abstracts in English
s X-ray emission spectra of MTiO (M=Mn,Fe,Co,Ni)Agui, Akane; Mizumaki, Masaichiro*
no journal, ,
no abstracts in English
Maekawa, Masaki; Yabuuchi, Atsushi; Kawasuso, Atsuo
no journal, ,
For the more detailed evaluation of the interaction between the crack progress by the stress corrosion cracking (SCC) of the stainless steel and the vacancy-type defects, we developed the in-situ measurement method that can measure the distribution of the vacancy-type defects by the positron microbeam under the tensile stress for the continuous corrosion. It was confirmed that the SCC crack progressed when the sample (SUS304, 20 micron thickness, sensitized) was exposed to the corrosion environment (MgCl solution) for 24 hours with the tensile stress of 100 MPa or more. From the observation of the crack tip probed by the positron microbeam, high S-parameter region near the crack tip was detected. This suggests that the vacancy-type defects was introduced along with the crack. In addition, after the more exposure to the erosive environment, the crack progress seems to occur preferentially in the high S-parameter region.
Iwata, Yoshihiro; Ito, Chikara; Harano, Hideki*; Aoyama, Takafumi
no journal, ,
no abstracts in English
YCuO
systemMochiku, Takashi*; Hata, Yoshiaki*; Tsuchiya, Yoshinori*; Igawa, Naoki; Hoshikawa, Akinori*; Ishigaki, Toru*; Yasuoka, Hiroshi*; Hirata, Kazuto*
no journal, ,
FeSrYCuO structure exhibits superconductivity around 60 K, when it is properly annealed in N and subsequently in O. In this study, oxygen arrangement in FeSrYCuO system is investigated by the neutron diffraction method. Cu and Fe in the crystal were ordered by annealing around 700
C in N due to structure phase transition from the tetragonal to monoclinic phase with a superlattice structure. It was revealed that the FeO tetrahedron was formed and ordered in the crystal while disordered in the original structure without N-annealing. It was observed that the FeO tetrahedron changed to the octahedron by the subsequently annealing in O.
He neutron spin filters, 3Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Takeda, Masayasu; Wakimoto, Shuichi; et al.
no journal, ,
Polarized neutron scattering is a powerful technique in order to clarify the magnetic structure of materials. The technique is often used in JRR-3 nowadays. However, the available energy has been limited below 100 meV as long as we use the conventional polarizing method. To realize polarized neutron scattering experiments above the energy, the use of 
He spin filters is the best solution. In addition, in the new pulsed neutron facility, J-PARC, the neutron source has wide energy spectrum. To polarize all the neutrons, it is desired to use the He spin filters. Taking these backgrounds into account, we are now planning to introduce He neutron spin filters to polarized neutron experiments at JRR-3 and J-PARC. In our oral presentation, we report the detailed plan of the experiments and the present status of the preparation.
Takeda, Masayasu; Suzuki, Junichi; Yamaguchi, Daisuke; Akiya, Takahiro*; Kato, Hiroaki*; Une, Yasuhiro*; Sagawa, Masato*
no journal, ,
A neodymium iron boron (Nd-Fe-B) sintered magnet is the most powerful permanent magnet among the commercially available ones. Dysprosium (Dy), however, has to be added in Nd-Fe-B sintered magnets to keep the high 
above the room temperature or high-temperature applications. Dy-less or Dy-free Nd-Fe-B sintered magnets are now highly demanded because Dy is one of the rare metals. We performed small-angle neutron scattering (SANS) measurements of sintered Nd-Fe-B sintered magnets to elucidate the correlation between the coercivity and averaged internal structures of this magnet. Such correlation is a clue to achieve the Dy-less or Dy-free Nd-Fe-B sintered magnets. In this talk, we report the detailed results of the experiments and the correlation revealed by the SANS measurements.
under magnetic fieldMetoki, Naoto; Kaneko, Koji; Sakai, Hironori; Haga, Yoshinori
no journal, ,
We observed almost no change in the inelastic neutron scattering profile of US with application of magnetic field up to 10T. It means that 5f electrons have the localized character in this compound up to 10T.
MoO
Kuroe, Haruhiko*; Hamasaki, Tomoyuki*; Hase, Masashi*; Kaneko, Koji; Metoki, Naoto; Matsuda, Masaaki; Kakurai, Kazuhisa; Oka, Kunihiko*; Ito, Toshimitsu*; Eisaki, Hiroshi*
no journal, ,
We have measured inelastic neutron scattering in CuMoO to study its magnetic-excitation dispersion curves. This material can be treated as a complex of the following two spin subsystems. (1) Quasi-one-dimensional antiferromagnetic (AF) spin chain with the intrachain interaction pJ4 = 6.3 meV, where p is the renormalization factor depending on the system dimension, together with the ferromagnetic and AF interchain interactions -Ja = J 0.01pJ4. (2) AF spin dimers with the interaction J3 = 5.8 meV. The hybridization parameter, representing the intersubsystem interaction between these subsystems, is estimated as Eint sin (k), where Eint = 1.6 meV. The modulation of the molecular field generated by the spin precession in the excited state of the quasi-one-dimensional spin chain plays an important role in this hybridization.
Yamazaki, Dai; Takeda, Masayasu; Soyama, Kazuhiko; Maruyama, Ryuji; Hirano, Tatsumi*
no journal, ,
We have started designing a polarized neutron reflectometer which dedicates to investigation on magnetic multilayers at MLF. In this contribution, design concept of the J-PARC polarized neutron reflectometer will be presented together with beam-line simulations and test results of the focusing devices.