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We have been designing a polarimeter for gamma-ray bursts (GRBs) sensitive to the energy range from 60 keV to 300 keV. It is a Compton-scattering-type polarimeter and it consists of four modules. The field of view for one module is ??45??. To estimate the performance, it is important to investigate the response for the irradiation from off-axis. So we had basic experiments with polarized beam and...
We studied measurement of secondary electron emission (SEE) of metal and insulating materials used for satellite thermal insulation or other such purposes. The SEE yield measurement is very important for analyzing charge accumulation on satellite surfaces for a space environment because electron emission related to irradiated electrons influences the amount of surface charge. Therefore, we tried to...
We have developed a new energy/mass spectrometer for medium energy range (10-200 keV/q) ion measurements in the Earth's magnetosphere and interplanetary space. The wide field-of-view ( ~360deg fan) enables acquisition of 3-D distribution functions for all the major ions, by utilizing spacecraft spin motions. The g-factor is much larger than the previous ion mass spectrometers in the medium energy...
Angle resolved photoemission spectroscopy (ARPES) with a synchrotron radiation as an incident photon source was performed on the layered cobalt oxides Na0.8CoO2. The measured electronic structure was compared with that of the Na0.7CoO2 previously reported. The observed energy-momentum dispersion of the Na0.8CoO2 was essentially the same with that of the Na0.7CoO2 except for the small difference in...
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