Background contributions in the electron-tracking Compton camera onboard SMILE-2+
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866911785107324928 |
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| author | Ikeda, Tomonori Takada, Atsushi Takemura, Taito Yoshikawa, Kei nakamura, Yuta Onozaka, Ken Abe, Mitsuru Tanimori, Toru |
| author_facet | Ikeda, Tomonori Takada, Atsushi Takemura, Taito Yoshikawa, Kei nakamura, Yuta Onozaka, Ken Abe, Mitsuru Tanimori, Toru |
| contents | The Mega electron volt (MeV) gamma-ray observation is a promising diagnostic tool for observing the universe. However, the sensitivity of MeV gamma-ray telescopes is limited due to peculiar backgrounds, restricting the application of MeV gamma rays for observation. Identification of backgrounds is crucial for designing next-generation telescopes. Therefore, herein, we assessed the background contribution in the electron-tracking Compton camera (ETCC) on board the SMILE- 2+ balloon experiment. This assessment was performed using the Monte Carlo simulation. The results revealed that the background below 400 keV existed due to the atmospheric gamma-ray background, the cosmic-ray/secondary-particle background, and the accidental background. On the other hand, the unresolved background component, which was not likely to be relevant to direct Compton-scattering events in the ETCC, was confirmed above 400 keV. Overall, this study demonstrated that the Compton-kinematics test provides a powerful tool to remove the background and principally improves the signal-to-noise ratio at 400 keV by an order of magnitude. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_02700 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Background contributions in the electron-tracking Compton camera onboard SMILE-2+ Ikeda, Tomonori Takada, Atsushi Takemura, Taito Yoshikawa, Kei nakamura, Yuta Onozaka, Ken Abe, Mitsuru Tanimori, Toru Instrumentation and Methods for Astrophysics The Mega electron volt (MeV) gamma-ray observation is a promising diagnostic tool for observing the universe. However, the sensitivity of MeV gamma-ray telescopes is limited due to peculiar backgrounds, restricting the application of MeV gamma rays for observation. Identification of backgrounds is crucial for designing next-generation telescopes. Therefore, herein, we assessed the background contribution in the electron-tracking Compton camera (ETCC) on board the SMILE- 2+ balloon experiment. This assessment was performed using the Monte Carlo simulation. The results revealed that the background below 400 keV existed due to the atmospheric gamma-ray background, the cosmic-ray/secondary-particle background, and the accidental background. On the other hand, the unresolved background component, which was not likely to be relevant to direct Compton-scattering events in the ETCC, was confirmed above 400 keV. Overall, this study demonstrated that the Compton-kinematics test provides a powerful tool to remove the background and principally improves the signal-to-noise ratio at 400 keV by an order of magnitude. |
| title | Background contributions in the electron-tracking Compton camera onboard SMILE-2+ |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2306.02700 |