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Volume 294 - The 3rd International Symposium on “Quest for the Origin of Particles and the Universe" (KMI2017) - Talk Presentations
GRAINE project: Cosmic Gamma-ray Observation by Balloon-Borne Telescope with Nuclear Emulsion
S. Aoki* on behalf of the GRAINE Collaboration
*corresponding author
Full text: pdf
Pre-published on: 2017 November 22
Published on: 2017 November 24
GRAINE, which stands for Gamma-Ray Astro-Imager with Nuclear Emulsion is a new gamma-ray observation project with balloon-borne emulsion telescope. Nuclear emulsion can determines incident gamma-ray angle measuring electron positron track right after the conversion with small material thickness (.002 radiation length par film). Thanks of this small thickness, angular resolution can reach 0.1\(^{\circ}\) for 1 GeV gamma-ray (1.0\(^{\circ}\) for 100 MeV) and it can be sensitive to polarization. GRAINE could bring precise observation of gamma-ray sources especially on the galactic plane by repeating long-duration flights with large aperture (10m\(^2\)) emulsion telescope.
In May 2015, we launched an emulsion telescope of 0.38 m\(^2\) aperture area from Alice Springs, Australia in order to demonstrate the overall imaging performance. Flight duration time was about 14.4 hours with 11.5 hours level flight at 37km altitude including 6 hours with the Vela pulsar in the field of view. Latest results and future plans are described.
Open Access
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