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Gamma-Ray and AntiMatter Survey(GRAMS) experiment
Authors:
J. Zeng,
T. Aramaki,
D. Ames,
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
, et al. (41 additional authors not shown)
Abstract:
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 th…
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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.
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Submitted 16 December, 2025;
originally announced December 2025.
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Antihelium-3 Sensitivity for the GRAMS Experiment
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
, et al. (41 additional authors not shown)
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 (…
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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.
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Submitted 5 August, 2025; v1 submitted 20 March, 2025;
originally announced March 2025.
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Searches for gamma-ray lines and `pure WIMP' spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S
Authors:
H. E. S. S. Collaboration,
:,
H. Abdalla,
F. Aharonian,
F. Ait Benkhali,
E. O. Angüner,
M. Arakawa,
C. Arcaro,
C. Armand,
M. Arrieta,
M. Backes,
M. Barnard,
Y. Becherini,
J. Becker Tjus,
D. Berge,
S. Bernhard,
K. Bernlöhr,
R. Blackwell,
M. Böttcher,
C. Boisson,
J. Bolmont,
S. Bonnefoy,
P. Bordas,
J. Bregeon,
F. Brun
, et al. (212 additional authors not shown)
Abstract:
Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five of these systems for a total of about 130 hours. The data are re-analyzed here, and, in the absence of any detected signals, are interpreted in terms of limits on the DM annihilation cross section. Two scenarios are considered: i) DM anni…
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Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five of these systems for a total of about 130 hours. The data are re-analyzed here, and, in the absence of any detected signals, are interpreted in terms of limits on the DM annihilation cross section. Two scenarios are considered: i) DM annihilation into mono-energetic gamma-rays and ii) DM in the form of pure WIMP multiplets that, annihilating into all electroweak bosons, produce a distinctive gamma-ray spectral shape with a high-energy peak at the DM mass and a lower-energy continuum. For case i), upper limits at 95\% confidence level of about $\langle σv \rangle \lesssim 3 \times 10^{-25}$ cm$^3$ s$^{-1}$ are obtained in the mass range of 400 GeV to 1 TeV. For case ii), the full spectral shape of the models is used and several excluded regions are identified, but the thermal masses of the candidates are not robustly ruled out.
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Submitted 1 October, 2018;
originally announced October 2018.