Sensitivity of the GAPS experiment to low-energy cosmic-ray antiprotons

The General Antiparticle Spectrometer (GAPS) is an upcoming balloon mission to measure low-energy cosmic-ray antinuclei during at least three ~35-day Antarctic flights. With its large geometric acceptance and novel exotic atom-based particle identification, GAPS will detect ~500 cosmic antiprotons per flight produce a precision antiproton spectrum in the kinetic energy range of ~0.07-0.21 GeV/n top atmosphere. these high statistics extending lower energies than any previous experiment, with complementary sources experimental uncertainty compared traditional magnetic spectrometers, measurement be sensitive dark matter, primordial black holes, ray propagation. also validate antinucleus identification technique for antideuteron antihelium rare-event searches. This analysis demonstrates sensitivity using full instrument simulation event reconstruction, including solar atmospheric effects.