PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
GRAINE, balloon-borne emulsion telescope experiments for precise gamma-ray observations
S. Takahashi
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Pre-published on: August 05, 2023
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We are developing a GRAINE project, 10 MeV -- 100 GeV cosmic gamma-ray observations with a precise (0.08 degree @ 1 -- 2 GeV) and polarization sensitive large-aperture-area ($\sim$10 m$^2$) emulsion telescope repeated long duration balloon flights. We demonstrated a feasibility and performance of the balloon-borne emulsion gamma-ray telescope experiment with various test experiments and developments on the ground, and balloon-borne experiments in 2011, 2015 and 2018. In 2018, we performed the balloon-borne experiment with a 0.38 m$^2$ aperture area and 17.4 hour flight duration in Australia by JAXA Scientific Ballooning. By the flight data analysis, we achieved highest imaging of the Vela pulsar ever and established the emulsion gamma-ray telescope with the world's highest angular resolution in the gamma-ray telescopes in this energy regime. Based on the experiences and achievements, we aim to start scientific observations expanding an aperture area and flight duration repeated balloon flights. In 2023, we performed the balloon-borne experiment in Australia with a 2.5 m$^2$ aperture area and 27 hour flight duration, aiming e.g. to observe Galactic Centre region with the highest imaging resolution. An overview and status of the GRAINE project, especially the latest results on the 2018 balloon-borne experiment and status of the 2023/future balloon-borne experiments are presented.
DOI: https://doi.org/10.22323/1.444.0598
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