GRAINE project: The first balloon-borne, emulsion gamma-ray telescope experiment
Abstrak
The GRAINE project (Gamma-Ray Astro-Imager with Nuclear Emulsion) has been developed for the observation of cosmic γ -rays in the energy range 10 MeV–100 GeV with a precise (0.08 ◦ at 1–2 GeV), polarization-sensitive, large-aperture-area ( ∼ 10 m 2 ) emulsion telescope by repeated long-duration balloon flights. In 2011, the first balloon-borne experiment was successfully performed with a 12 . 5 × 10 cm 2 aperture area and 4.6 hour flight duration for a feasibility and performance test. Systematic detection, energy reconstruction, and timestamping of γ -ray events were performed across the whole area of the emulsion film, up to 45 ◦ incident zenith angle, down to 50 MeV γ -ray energy, with 97% detection reliability, 0.2 sec timestamp accuracy, and 98% timestamp reliability. A γ -ray data checking and calibration method was created using the γ -rays produced in the converter. We measured the atmospheric γ -ray flux in the energy range 50–300 MeV and obtained a first understanding of the cosmic γ -ray background. By combining the attitude data, we established a procedure for determining the γ -ray arrival direction in celestial coordinates. The first flight of the balloon-borne emulsion telescope confirmed its potential as a high-performance cosmic γ -ray detector.
Topik & Kata Kunci
Penulis (7)
S. Takahashi
S. Aoki
K. Kamada
S. Mizutani
Ryou Nakagawa
K. Ozaki
H. Rokujo
Akses Cepat
- Tahun Terbit
- 2015
- Bahasa
- en
- Total Sitasi
- 33×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1093/PTEP/PTV046
- Akses
- Open Access ✓