2025/03/20 by Jiancheng Zeng, Zeng, J., Takayuki Aramaki +126 · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2503.16694
openalex publication_date 2025/03/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 × 3 flights) and future satellite mission (2-year observation / 10-year observation), the sensitivities become 1.47 × 10-7 [m2 s sr GeV/n]-1 and 1.55 × 10-9 [m2 s sr GeV/n]-1 / 3.10×10-10 [m2 s sr GeV/n]-1, respectively. The results indicate that GRAMS can extensively investigate various dark matter models through the antihelium-3 measurements.