SMILE-3: sky survey in MeV gamma-ray using the 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

doi:10.1117/12.2560886

13 December 2020 SMILE-3: sky survey in MeV gamma-ray using the 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

Author Affiliations +

Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray; 1144467 (2020) https://doi.org/10.1117/12.2560886
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

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.

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A. Takada, T. Tanimori, Y. Mizumura, T. Takemura, K. Yoshikawa, Y. Nakamura, M. Abe, H. Kubo, S. Kurosawa, K. Miuchi, T. Sawano, and H. Hamaguchi "SMILE-3: sky survey in MeV gamma-ray using the electron-tracking Compton telescope loaded on balloons", Proc. SPIE 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray, 1144467 (13 December 2020); https://doi.org/10.1117/12.2560886

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