DOE OSTI · 3002262
Antihelium-3 sensitivity for the GRAMS experiment
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 x 3 flights) and future satellite mission (2-year observation/10-year observation), the sensitivities become 1.47 × 10 −7 [m 2 s sr GeV/n] −1 and 1.55 × 10 −9 [m 2 s sr GeV/n] −1 /3.10 x 10 -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.
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Zeng, J. [Northeastern Univ., Boston, MA (United States); et al.] (ORCID:0000000241571964), Aramaki, T., Aoyama, K., Arai, S., Asaadi, J., Bamba, A., Cannady, N., Coppi, P., De Nolfo, G., Errando, M., Fabris, Lorenzo (ORCID:0000000156055615), Fujiwara, T., Fukazawa, Y., Ghosh, P., Hagino, K., Hakamata, T., Hiroshima, N., Ichihashi, M., Ichinohe, Y., Inoue, Y., Ishikawa, K., Ishiwata, K., Iwata, T., Karagiorgi, G., Kato, T., Kawamura, H., Khangulyan, D., Krizmanic, J., LeyVa, J., Malige, A., Mitchell, J.G., Mitchell, J.W., Mukherjee, R., Nakajima, R., Nakazawa, K., Odaka, H., Okuma, K., Perez, K., Poudyal, N., Safa, I., Sakai, K., Sasaki, M., Seligman, W., Sensenig, J., Shirahama, K., Shiraishi, T., Smith, S., Suda, Y., Suraj, A., Takahashi, H., Takashima, S., Tamba, T., Tanaka, M., Tandon, S., Tatsumi, R., Tomsick, J., Tsuji, N., Uchida, Y., Utsumi, Y., Watanabe, S., Yano, Y., Yawata, K., Yoneda, H., Yorita, K., Yoshimoto, M.. 2025-07-28. Antihelium-3 sensitivity for the GRAMS experiment. https://doi.org/10.1016/j.astropartphys.2025.103152
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