Balloon-borne gamma-ray telescope with nuclear emulsion : overview and   status
  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 in emulsion scanning, emulsion analyzing capability is becoming increasingly powerful. Presently, we are developing a balloon-borne gamma-ray telescope using nuclear emulsion. An overview and a status of our telescope is given. 
Shigeki Aoki, Tsutomu Fukuda, Kaname Hamada, Toshio Hara, Atsushi   Iyono, Jiro Kawada, Masashi Kazuyama, Koichi Kodama, Mas...
astro-ph.IM