Reconstruction of multiple Compton scattering events in MeV gamma-ray Compton telescopes towards GRAMS: The physics-based probabilistic model

Hiroki Yoneda*, Hirokazu Odaka, Yuto Ichinohe, Satoshi Takashima, Tsuguo Aramaki, Kazutaka Aoyama, Jonathan Asaadi, Lorenzo Fabris, Yoshiyuki Inoue, Georgia Karagiorgi, Dmitry Khangulyan, Masato Kimura, Jonathan Leyva, Reshmi Mukherjee, Taichi Nakasone, Kerstin Perez, Mayu Sakurai, William Seligman, Masashi Tanaka, Naomi TsujiKohei Yorita, Jiancheng Zeng

*この研究の対応する著者

研究成果: Article査読

抄録

Aimed at progress in mega-electron volt (MeV) gamma-ray astronomy, which has not yet been well-explored, Compton telescope missions with a variety of detector concepts have been proposed so far. One of the key techniques for these future missions is an event reconstruction algorithm that is able to determine the scattering orders of multiple Compton scattering events and to identify events in which gamma rays escape from the detectors before they deposit all of their energies. We revisit previous event reconstruction methods and propose a modified algorithm based on a probabilistic method. First, we present a general formalism of the probabilistic model of Compton scattering describing physical interactions inside the detector and measurement processes. Then, we also introduce several approximations in the calculation of the probability functions for efficient computation. For validation, the developed algorithm has been applied to simulation data of a Compton telescope using a liquid argon time projection chamber, which is a new type of Compton telescope proposed for the GRAMS project. We have confirmed that it works successfully for up to 8-hit events, including correction of incoming gamma-ray energies for escape events. The proposed algorithm can be used for next-generation MeV gamma-ray missions featured by large-volume detectors, e.g., GRAMS.

本文言語English
論文番号102765
ジャーナルAstroparticle Physics
144
DOI
出版ステータスPublished - 2022 11月

ASJC Scopus subject areas

  • 天文学と天体物理学

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