PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Analyses of cosmic ray tracks registered in transport test emulsion films for the GRAINE 2023 experiments
S. Akita
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Pre-published on: August 18, 2023
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The GRAINE(Gamma-Ray Astro-imager with Nuclear Emulsion films) project aims to observe gamma-ray sources in the energies of sub-GeV to 10 GeV with high angular resolution. The GRAINE experiment carried out the observations of gamma ray arrival directions by using long duration balloon flights of large-area emulsion films with high angular resolution to earn the total amount of cosmic origin gamma rays, and explored unsolved problems such as the production mechanism of high-energy gamma rays at astronomical sources. Three previous flight experiments have been conducted in 2015, 2018, and 2023. In the previous experiment (2018), the balloon borne experiment(GRAINE2018) with an aperture area of 0.38 m2 and a flight time of 17 hours was conducted in Australia, and the imaging of Vela pulsar was successfully obtained. The current experiment (GRAINE2023) has a larger scale than the previous experiment(GRAINE2018), such as an aperture area of 5 m2 and a flight duration of 26 hours. The GRAINE2023 balloon flight experiment took off on April 30, 2023, at 6:00 a.m. Japan standard time, and after 26 hours of flight, landed at a point 220 km south of Longreach, Queensland, Australia. After the successful recovery, chemical developing of nuclear emulsion films were completed. In this presentation, the transport test of nuclear emulsion films for GRAINE2023 balloon flight are going to be reported as well as the GRAINE2023 experiment and the HTS(hyper Track Selector) .
DOI: https://doi.org/10.22323/1.444.0811
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