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Main Authors:	Zeng, J., Aramaki, T., Ames, D., Aoyama, K., Arai, S., Asaadi, J., Bamba, A., Cannady, N., Coppi, P., De Nolfo, G., Errando, M., Fabris, L., 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., 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.
Format:	Preprint
Published:	2025
Subjects:	High Energy Physics - Experiment High Energy Astrophysical Phenomena
Online Access:	https://arxiv.org/abs/2512.14913
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_version_	1866918251743674368
author	Zeng, J. Aramaki, T. Ames, D. Aoyama, K. Arai, S. Arai, S. Asaadi, J. Bamba, A. Cannady, N. Coppi, P. De Nolfo, G. Errando, M. Fabris, L. 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. 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.
author_facet	Zeng, J. Aramaki, T. Ames, D. Aoyama, K. Arai, S. Arai, S. Asaadi, J. Bamba, A. Cannady, N. Coppi, P. De Nolfo, G. Errando, M. Fabris, L. 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. 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.
contents	The Gamma-Ray and AntiMatter Survey (GRAMS) is a next-generation experiment using a Liquid Argon Time Projection Chamber (LArTPC) detector to measure MeV gamma rays and antiparticles. MeV gamma-ray observations are important for understanding multi-messenger and time-domain astronomy, enabling exploration of the universe's most potent events, such as supernovae and neutron star mergers. Despite the significance of MeV gamma-rays, GRAMS could also explore the so-called 'MeV gap' region to improve MeV gamma-ray measurement sensitivity that was restricted by the challenge of accurately reconstructing Compton events. Aside from gamma-ray detection, the GRAMS proposed method also serves as an antiparticle spectrometer, targeting the low-energy range of cosmic antinuclei measurements. This work will provide updates on the current status and progress towards the prototype balloon flight with a small-scale LArTPC (pGRAMS) scheduled for early 2026, as well as the recent progress on antihelium-3 sensitivity calculation.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_14913
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Gamma-Ray and AntiMatter Survey(GRAMS) experiment Zeng, J. Aramaki, T. Ames, D. Aoyama, K. Arai, S. Arai, S. Asaadi, J. Bamba, A. Cannady, N. Coppi, P. De Nolfo, G. Errando, M. Fabris, L. 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. 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. High Energy Physics - Experiment High Energy Astrophysical Phenomena The Gamma-Ray and AntiMatter Survey (GRAMS) is a next-generation experiment using a Liquid Argon Time Projection Chamber (LArTPC) detector to measure MeV gamma rays and antiparticles. MeV gamma-ray observations are important for understanding multi-messenger and time-domain astronomy, enabling exploration of the universe's most potent events, such as supernovae and neutron star mergers. Despite the significance of MeV gamma-rays, GRAMS could also explore the so-called 'MeV gap' region to improve MeV gamma-ray measurement sensitivity that was restricted by the challenge of accurately reconstructing Compton events. Aside from gamma-ray detection, the GRAMS proposed method also serves as an antiparticle spectrometer, targeting the low-energy range of cosmic antinuclei measurements. This work will provide updates on the current status and progress towards the prototype balloon flight with a small-scale LArTPC (pGRAMS) scheduled for early 2026, as well as the recent progress on antihelium-3 sensitivity calculation.
title	Gamma-Ray and AntiMatter Survey(GRAMS) experiment
topic	High Energy Physics - Experiment High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2512.14913

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