Antihelium-3 Sensitivity for the GRAMS Experiment

J. Zeng; T. Aramaki; K. Aoyama; S. Arai; S. Arai; J. Asaadi; A. Bamba; N. Cannady; P. Coppi; G. De Nolfo; M. Errando; L. Fabris; T. Fujiwara; Y. Fukazawa; P. Ghosh; K. Hagino; T. Hakamata; N. Hiroshima; M. Ichihashi; Y. Ichinohe; Y. Inoue; K. Ishikawa; K. Ishiwata; T. Iwata; G. Karagiorgi; T. Kato; H. Kawamura; D. Khangulyan; J. Krizmanic; J. LeyVa; A. Malige; J. G. Mitchell; J. W. Mitchell; R. Mukherjee; R. Nakajima; K. Nakazawa; H. Odaka; K. Okuma; K. Perez; N. Poudyal; I. Safa; K. Sakai; M. Sasaki; W. Seligman; J. Sensenig; K. Shirahama; T. Shiraishi; S. Smith; Y. Suda; A. Suraj

doi:10.1016/j.astropartphys.2025.103152

Antihelium-3 Sensitivity for the GRAMS Experiment

High Energy Physics - Experiment 2025-08-06 v3

Authors: J. Zeng , T. Aramaki , K. Aoyama , S. Arai , S. Arai , J. Asaadi , A. Bamba , N. Cannady , P. Coppi , G. De Nolfo , M. Errando , L. Fabris , T. Fujiwara , Y. Fukazawa , P. Ghosh , K. Hagino , T. Hakamata , N. Hiroshima , M. Ichihashi , Y. Ichinohe , Y. Inoue , K. Ishikawa , K. Ishiwata , T. Iwata , G. Karagiorgi , T. Kato , H. Kawamura , D. Khangulyan , J. Krizmanic , J. LeyVa , A. Malige , J. G. Mitchell , J. W. Mitchell , R. Mukherjee , R. Nakajima , K. Nakazawa , H. Odaka , K. Okuma , K. Perez , N. Poudyal , I. Safa , K. Sakai , M. Sasaki , W. Seligman , J. Sensenig , K. Shirahama , T. Shiraishi , S. Smith , Y. Suda , A. Suraj , H. Takahashi , S. Takashima , T. Tamba , M. Tanaka , S. Tandon , R. Tatsumi , J. Tomsick , N. Tsuji , Y. Uchida , Y. Utsumi , S. Watanabe , Y. Yano , K. Yawata , H. Yoneda , K. Yorita , M. Yoshimoto

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Abstract

The Gamma-Ray and AntiMatter Survey (GRAMS) is a next-generation balloon/satellite mission utilizing a Liquid Argon Time Projection Chamber (LArTPC) detector to measure both MeV gamma rays and antinuclei produced by dark matter annihilation or decay. The GRAMS can identify antihelium-3 events based on the measurements of X-rays and charged pions from the decay of the exotic atoms, Time of Flight (TOF), energy deposition, and stopping range. This paper shows the antihelium-3 sensitivity estimation using a GEANT4 Monte Carlo simulation. For the proposed long-duration balloon (LDB) flight program (35 days $\times$ 3 flights) and future satellite mission (2-year observation / 10-year observation), the sensitivities become 1.47 $\times$ 10 $^{-7}$ [m $^2$ s sr GeV/n] $^{-1}$ and 1.55 $\times$ 10 $^{-9}$ [m $^2$ s sr GeV/n] $^{-1}$ / $3.10\times10^{-10}$ [m $^2$ s sr GeV/n] $^{-1}$ , respectively. The results indicate that GRAMS can extensively investigate various dark matter models through the antihelium-3 measurements.

Keywords

space missions and instrumentation gaseous detectors liquid argon detectors

Cite

@article{arxiv.2503.16694,
  title  = {Antihelium-3 Sensitivity for the GRAMS Experiment},
  author = {J. Zeng and T. Aramaki and K. Aoyama and S. Arai and S. Arai and J. Asaadi and A. Bamba and N. Cannady and P. Coppi and G. De Nolfo and M. Errando and L. Fabris and T. Fujiwara and Y. Fukazawa and P. Ghosh and K. Hagino and T. Hakamata and N. Hiroshima and M. Ichihashi and Y. Ichinohe and Y. Inoue and K. Ishikawa and K. Ishiwata and T. Iwata and G. Karagiorgi and T. Kato and H. Kawamura and D. Khangulyan and J. Krizmanic and J. LeyVa and A. Malige and J. G. Mitchell and J. W. Mitchell and R. Mukherjee and R. Nakajima and K. Nakazawa and H. Odaka and K. Okuma and K. Perez and N. Poudyal and I. Safa and K. Sakai and M. Sasaki and W. Seligman and J. Sensenig and K. Shirahama and T. Shiraishi and S. Smith and Y. Suda and A. Suraj and H. Takahashi and S. Takashima and T. Tamba and M. Tanaka and S. Tandon and R. Tatsumi and J. Tomsick and N. Tsuji and Y. Uchida and Y. Utsumi and S. Watanabe and Y. Yano and K. Yawata and H. Yoneda and K. Yorita and M. Yoshimoto},
  journal= {arXiv preprint arXiv:2503.16694},
  year   = {2025}
}

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9 pages, 9 figures

Antihelium-3 Sensitivity for the GRAMS Experiment

Abstract

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