Speaker
Description
The GRAINE project observes cosmic gamma-rays, using a balloon-borne emulsion-film-based telescope in 10MeV-100GeV energy band. The high spatial resolution (<1μm) of the emulsion films makes high angular resolution (5◦ at 100 MeV and 0.8◦ at 1 GeV) and polarization sensitivity for the gamma-ray. One of our target is Galactic center region. A few GeV Gamma-rays are expected to be produced via the annihilation of dark matters in there, but the observation is difficult due to the contamination of diffuse gamma-ray background. The high angular resolution makes low contamination of the background and our observation may bring new insights.
In the GRAINE project, we conducted 4th balloon experiment (GRAINE2023) in 2023. Its aperture area of the emulsion gamma-ray telescope was 2.5 m^2. The Galactic center region was observed for the first time with the emulsion gamma-ray telescope in the GRAINE2023. We will report the preliminary results in GRAINE2023 for the brightest gamma-ray source in this energy band (Vela pulsar) and the Galactic center region.
| Collaboration(s) | GRAINE |
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