24 research outputs found
Direct search for solar axions by using strong magnetic field and X-ray detectors
We have searched for axions which could be produced in the solar core by
exploiting their conversion to X rays in a strong laboratory magnetic field.
The signature of the solar axion is an increase in the rate of the X rays
detected in a magnetic helioscope when the sun is within its acceptance.
From the absence of such a signal we set a 95% confidence level limit on the
axion coupling to two photons GeV, provided the axion mass eV. The limit on the
coupling is factor 4.5 more stringent than the recent experimental result. This
is the first experiment whose sensitivity to is higher than
the limit constrained by the solar age consideration.Comment: 11 pages, REVTeX, 4 eps figures included, submitted to PL
Formation and characterization of phthalocyanine dimer/C60 solar cells
AbstractOrganic solar cells with μ-oxo-bridged gallium phthalocyanine dimer (GaPc dimer) and fullerene were produced by an evaporation method. A device based on the GaPc dimer provided a conversion efficiency of 4.2×10–3%, which is better compared to a device based on phthalocyanine monomer. Dimerization effect was discussed with a molecular orbital calculation, and the crystalline phases of the present solar cells were investigated by X-ray diffraction. Further improvement of the efficiency was discussed on the basis of the experimental results
Soft X-ray angle-resolved photoemission with micro-positioning techniques for metallic V 2
Effect of Dispersing and Viscous Agents on Aqueous Dispersion System of Titanium Dioxide
L-Asparaginase-Induced Pancreatic Injury is Associated with an Imbalance in Plasma Amino Acid Levels
Soft X-ray Angle Resolved Photoemission with Micro Positioning Techniques for Metallic V2O3
Soft X-ray angle-resolved photoemission has been performed for metallic V2O3. By combining a microfocus beam (40 µm × 65 µm) and micro-positioning techniques with a long-working-distance microscope, it has been possible to observe band dispersions from tiny cleavage surfaces with a typical size of several tens of µm. The photoemission spectra show a clear position dependence, reflecting the morphology of the cleaved sample surface. By selecting high-quality flat regions on the sample surface, it has been possible to perform band mapping using both photon-energy and polar-angle dependences, opening the door to three-dimensional angle-resolved photoemission spectroscopy for typical three-dimensional correlated materials where large cleavage planes are rarely obtained