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18 Mori, T.; Kawamura, H.
(Graduate School of Science)
Simulation Study of Spatiotemporal Correlations of Earthquakes as a Stick-Slip Frictional Instability
Physical Review Letters, 94, 058501/1-4 (2005)

This paper studies on spatiotemporal correlations of earthquakes by means of extensive computer simulations of a statistical model of earthquakes. The model studied is the one-dimensional spring-block model called the Burridge-Knopoff model. The model exhibits several eminent precursory phenomena prior to the large event. Preceding the mainshock, the frequency of smaller events is gradually enhanced, whereas, just before the mainshock, it is suppressed in a close vicinity of the epicenter of the upcoming event (the Mogi doughnut). Such distinct precursory phenomena may open a way to the prediction of the time and the position of the upcoming large event.

19 Murata, T.; Morita, Y.; Fukui, K.; Sato, K.; Shiomi, D.; Takui, T.; Maesato, M.; Yamochi, H.; Saito, G.; Nakasuji, K.
(Graduate School of Science)
A Purely Organic Molecular Metal Based on a Hydrogen-Bonded Charge-Transfer Complex: Crystal Structure and Electronic Properties of TTF-Imidazole-p-Chloranil
Angewandte Chemie International Edition, 43, 6343-6346 (2004)

This paper reports on the first disclosure of a purely organic molecular metal based on the hydrogen-bonded charge-transfer complex composed of TTF-imidazole and p-chloranil, demonstrating novel abilities of H-bonding in the solid state to control component molecular ratio and increase electron-accepting ability of p-chloranil. These salient features underlying directing and site-selective H-bonding nature give a new materials challenge and will be of critical importance to the future development of molecular design for multi-functional purely organic molecular conductors.

20 Okada, M.*1; Moritani, K.*1; Kasai, T.*1; Diño, W. A.*2; Kasai, H.*2; Ogura, S.; Wilde, M.; Fukutani, K.
*1 (Graduate School of Science) *2 (Graduate School of Engineering)
Trapping Hydrogen with a Bimetallic Interface
Physical Review B, 71, 033408/1-4 (2005)

This paper reports results of a study on the interaction of hydrogen with thin Au films grown on an Ir{111} surface at ~100 K, using nuclear reaction analysis and first-principles calculations. We found that H atoms can be confined at the interface between the bulk-Ir surface and the Au thin film, which is realized by increasing the binding energy and the activation barrier for desorption via lattice relaxation of the Au layer.

21 Okamura, T.; Iwamura, T.; Seno, S.; Yamamoto, H.; Ueyama, N.
(Graduate School of Science)
Right-Handed Helical Structure of Expanded Oligo(L-leucine) Containing [Ru(terpyridine)2]2+ Moieties
Journal of the American Chemical Society, 126, 15972-15973 (2004)

Expanded oligo(L-leucine), containing an alternate arrangement of bis(terpyridine)ruthenium(II) moiety and a L-leucine residue, was synthesized and characterized by 1H NMR, UV, CD, and electrochemical properties. The intensity of CD spectra per ruthenium unit increased with the elongation of the peptide chain. 1H NMR analysis of a tetramer indicated the right-handed 41 helical structure in acetonitrile.

22 Okumura, D.; Toyoda, M.; Ishihara, M.; Katakuse, I.
(Graduate School of Science)
Application of a Multi-Turn Time-of-Flight Mass Spectrometer, MULTUM II, to Organic Compounds Ionized by Matrix-Assisted Laser Desorption/Ionization
Journal of Mass Spectrometry, 39, 86-90 (2004)

23 Sekiyama, A.*1; Fujiwara, H.*1; Imada, S.*1; Suga, S.*1; Eisaki, H.;Uchida, S.I.; Takegahara, K.; Harima, H.*2; Saitoh, Y.; Nekrasov, I.A.;Keller, G.; Kondakov, D.E.;Kozhevnikov, A.V.; Pruschke, Th.; Held, K.; Vollhardt, D.; Anisimov, V.I.
*1 (Graduate School of Engineering Science) *2 (Institute of Scientific and Industrial Research)
Mutual Experimental and Theoretical Validation of Bulk Photoemission Spectra of Sr1-xCaxVO3
Physical Review Letters, 93, 156402/1-4 (2004)

Photoemission is useful to clarify electronic states of solids. However, the high-resolution photoemission spectra have been obtained by low-energy excitations, mainly reflecting the surface electronic states. Owing to the bulk-sensitive high-resolution high-energy photoemission which has been realized by the authors, it is found that the bulk spectral function of the strongly correlated transition metal oxides Sr1-xCaxVO3 is qualitatively different from the so far reported low-energy photoemission spectra. The bulk spectra are consistently explained by a parameter-free dynamical mean-field theory.

24 Takada, T.; Kawai, K.; Fujitsuka, M.; Majima, T.
(Institute of Scientific and Industrial Research)
Direct Observation of Hole Transfer through Double-Helical DNA over 100 Å
Proceedings of the National Academy of Sciences of the United States of America, 101, 14002-14006 (2004)

25 Thomas, A.W.; Hicks, K.; Hosaka, A.
(Research Center for Nuclear Physics)
A Method to Unambiguously Determine the Parity of the Θ+ Pentaquark
Progress of Theoretical Physics, 111, 291-293 (2004)

With the recent observation of the Θ+(1540) pentaquark (five-quark baryon) by the LEPS group at SPring-8, the question of its parity is paramount since this will constrain the correct description of its internal structure. We show that the measurement of the spin singlet and triplet cross sections for the reaction pp →Σ+Θ+ using the polarized proton beam and target will unambiguously determine the parity of the Θ+(1540).

26 Yamaguchi, A.; Ono, T.; Nasu, S.; Miyake, K.; Mibu, K.; Shinjo, T.
(Graduate School of Engineering Sience)
Real-Space Observation of Current-Driven Domain Wall Motion in Submicron Magnetic Wires
Physical Review Letters, 92, 077205/1-4 (2004)

27 Yoshida, M.; et al. (The K2K Collaboration)
(Graduate School of Science)
Search for Electron Neutrino Appearance in a 250 km Long-baseline Experiment
Physical Review Letters, 93, 051801/1-5 (2004)

We search for neutrino oscillation with the mode of electron neutrino appearance from accelerator-produced muon neutrinos in the K2K long baseline neutrino experiment. One candidate event is found in data taken in the period from 1999 to 2001, while the expected background in the absence of neutrino oscillations is estimated to be 2.4 events with an uncertainty of 0.6 events. As a result, we obtain the first experimental limit on electron neutrino appearance with sensitivity to the atmospheric neutrino oscillation parameter region.

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