SMILE-3: Sky survey in MeV gamma-ray using an electron-tracking Compton telescope loaded on balloons

A. Takada, T. Tanimori, Y. Mizumura, T. Takemura, K. Yoshikawa, Y. Nakamura, M. Abe, H. Kubo, S. Kurosawa, K. Miuchi, T. Sawano, H. Hamaguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


MeV gamma-ray astronomy in an energy range of hundreds of keV to tens of MeV is a unique window for observing nucleosynthesis, however this field has not opened up until recently because of imaging difficulties. Thus, we are developing an electron-tracking Compton camera (ETCC), which consists of a gaseous electron tracker and pixel scintillator arrays, as a next generation MeV gamma-ray telescope. Because the ETCC detects all parameters after Compton scattering, we can determine the momentum of incident gamma-rays with powerful background rejection. This ETCC has confirmed low-noise and high-sensitivity observations at high altitude through Sub-MeV gamma-ray Imaging Loaded-on-balloon Experiment I (SMILE-I) in 2006 and SMILE-2+ in 2018. Therefore, we are planning scientific observations using an ETCC with an effective area of ∼10 cm2 for 0.3 MeV, a spatial resolution of ≤10 degrees for 0.5 MeV, and a field of view of 3 sr as the next step (SMILE-3). In this paper, we present the design of the SMILE-3 ETCC and its expected observations.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2020
Subtitle of host publicationUltraviolet to Gamma Ray
EditorsJan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa
ISBN (Electronic)9781510636750
Publication statusPublished - 2020
EventSpace Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray - Virtual, Online, United States
Duration: 2020 Dec 142020 Dec 18

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSpace Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray
Country/TerritoryUnited States
CityVirtual, Online


  • Balloon experiment
  • Compton telescope
  • MeV gamma-ray astronomy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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