A first measurement of the interaction cross section of the tau neutrino

The DONuT experiment collected data in 1997 and published first results in 2000 based on four observed $\nu_\tau$ charged-current (CC) interactions. The final analysis of the data collected in the experiment is presented in this paper, based on $3.6 \times 10^{17}$ protons on target using the 800 GeV Tevatron beam at Fermilab. The number of observed $\nu_\tau$ CC interactions is 9, from a total of 578 observed neutrino interactions. We calculated the energy-independent part of the tau-neutrino CC cross section ($\nu + \bar \nu$), relative to the well-known $\nu_e$ and $\nu_\mu$ cross sections. The ratio $\sigma(\nu_\tau)$/$\sigma(\nu_{e,\mu})$ was found to be $1.37\pm0.35\pm0.77$. The $\nu_\tau$ CC cross section was found to be $0.72 \pm 0.24\pm0.36 \times 10^{-38}$ cm$^{2}\rm{GeV}^{-1}$. Both results are in agreement the Standard Model.Comment: 37 pages, 15 figure

玉砂利を使用したオープンケーソンに作用する周面摩擦に関する研究(IV)

The SS caisson (SPACE SYSTEM CAISSON) method fills the space (gap) between caisson circumference surface and country rock with the space gravel, and it is the open caisson method which gently installs the caisson only by the dead weight at the good accuracy by reducing skin friction resistance which depends on caisson circumference surface, while the stability of country rock is attempted. The following have been carried out : Until now field measurement and indoor model experiment of conventional normal caisson model and the SS caisson model without exhaust slot. As the result, it was proven that the skin friction decreased from open caisson very much This time, it experimented based on this result in order to consider the effect as in addition, there is an exhaust slot.textapplication/pdfdepartmental bulletin pape

宇宙用高精度大型構造物の研究開発: スマート形状可変鏡

application/pdf日本航空宇宙学会誌. 2018, 66 (5), P.50-55journal articl

Study of Time-Dependent CP Violation in B0→J/ψπ0 Decays

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三重大学附属図書館のブランド化戦略 : 広報誌のリニューアルを中心に(<特集>わが図書館をブランドにするために!)

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Structural Basis of the Lactate-dependent Allosteric Regulation of Oxygen Binding in Arthropod Hemocyanin

Hemocyanin (Hc) is an oxygen carrier protein in which oxygen binding is regulated by allosteric effectors such as H+ and l-lactate. Isothermal titration calorimetric measurements showed that l-lactate binds to dodecameric and heterohexameric Hc and to the CaeSS3 homohexamer but not to the CaeSS2 monomer. The binding of lactate caused no change in the optical absorption and x-ray absorption spectra of either oxy- or deoxy-Hc, suggesting that no structural rearrangement of the active site occurred. At pH 6.5, the oxygen binding rate constant kobs obtained by flash photolysis showed a significant increase upon addition of l-lactate, whereas l-lactate addition had little effect at pH 8.3. Lactate binding caused a concentration-dependent shift in the interhexameric distances at pH 6.5 based on small angle x-ray scattering measurements. These results show that l-lactate affects oxygen affinity at pH 6.5 by modulating the global structure of Hc without affecting its binuclear copper center (the active site). In contrast to this, the active site structure of deoxy-Hc is affected by changes in pH (Hirota, S., Kawahara, T., Beltramini, M., Di Muro, P., Magliozzo, R. S., Peisach, J., Powers, L. S., Tanaka, N., Nagao, S., and Bubacco, L. (2008) J. Biol. Chem. 283, 31941-31948). Upon addiction of lactate, the kinetic behavior of oxygen rebinding for Hc was heterogeneous under low oxygen concentrations at pH 6.5 due to changes in the T and R state populations, and the equilibrium was found to shift from the T toward the R state with addition of lactate.journal articl