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First overnight balloon flight of the GRAINE 2023 emulsion gamma-ray telescope enabled by a large-scale pressure-vessel gondola
Hiroki Rokujo, Shigeki Aoki, Takashi Azuma +34
The Gamma-Ray Astro Imager with Nuclear Emulsion (GRAINE) project conducts precision observations of sub-GeV--GeV cosmic gamma rays using a balloon-borne nuclear-emulsion telescope…
New high-precision measurement system for electron-positron pairs from sub-GeV/GeV gamma-rays in the emulsion telescope
Yuya Nakamura, Shigeki Aoki, Tomohiro Hayakawa +27
The GRAINE project observes cosmic gamma-rays, using a balloon-borne emulsion-film-based telescope in the sub-GeV/GeV energy band. We reported in our previous balloon experiment in…
First demonstration of gamma-ray imaging using balloon-borne emulsion telescope
Hiroki Rokujo, Shigeki Aoki, Kaname Hamada +30
We promote the precise gamma-ray observation project Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE), which uses balloon-borne emulsion gamma-ray telescopes. The emulsion tel…
Demonstration of polarization sensitivity of emulsion-based pair conversion telescope for cosmic gamma-ray polarimetry
Keita Ozaki, Satoru Takahashi, Shigeki Aoki +4
Linear polarization of high-energy gamma-rays (10 MeV-100 GeV) can be detected by measuring the azimuthal angle of electron-positron pairs and observing the modulation of the azimu…
Balloon-borne gamma-ray telescope with nuclear emulsion : overview and status
Shigeki Aoki, Tsutomu Fukuda, Kaname Hamada +28
Detecting the first electron pairs with nuclear emulsion allows a precise measurement of the direction of incident gamma-rays as well as their polarization. With recent innovations…
Balloon-borne gamma-ray telescope with nuclear emulsion
Satoru Takahashi
By detecting the beginning of electron pairs with nuclear emulsion, precise gamma-ray direction and gamma-ray polarization can be detected. With recent advancement in emulsion scan…