| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
We analyzed 5-year data acquired with the CALET detector on board the International Space Station and obtained gamma-ray candidates above 10 GeV. We searched for monochromatic (line) gamma-ray signals in the data expected to originate from pair annihilation or decay of dark matter particles.
Assuming four regions of interest in the Galactic center region corresponding to four Galactic halo density profile models, we obtained energy spectra of gamma-ray candidates excluding point source regions. These spectra are consistent with a power-law form with single index. Thus we derived upper limits on fluxes of line gamma-ray signals from the observed spectra. Compared with the expected flux of signal assuming that the Galactic halo consists of dark matter, we calculated limits on the annihilation cross section times the relative velocity for the pair annihilation case and on the lifetime for the decay case. These results will be reported in international conferences and in academic journals.
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