Abstract
The General Antiparticle Spectrometer (GAPS) experiment is a balloon payload designed to measure low-energy cosmic antinuclei during at least three ∼35-day Antarctic flights, with the first flight planned for December, 2022. With its large geometric acceptance and novel exotic atom-based particle identification method, GAPS will detect ∼1000 antiprotons per flight, producing a precision cosmic antiproton spectrum in the kinetic energy range of 0.03 − 0.23 GeV/n at float altitude (corresponding to 0.085 − 0.30 GeV/n at the top of the atmosphere). With these high statistics in a measurement extending to lower energy than any previous experiment, and with orthogonal sources of systematic uncertainty compared to measurements made using traditional magnetic spectrometer techniques, the GAPS antiproton measurement will be sensitive to physics including dark matter annihilation, primordial black hole evaporation, and cosmic ray propagation. The antiproton measurement will also validate the GAPS exotic atom technique for the antideuteron and antihelium rare-event searches and provide insight into models of cosmic particle attenuation and production in the atmosphere. This contribution demonstrates the GAPS sensitivity to antiprotons using a full instrument simulation, event reconstruction, and solar and atmospheric effects.
Original language | English |
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Article number | 136 |
Journal | Proceedings of Science |
Volume | 395 |
State | Published - Mar 18 2022 |
Event | 37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany Duration: Jul 12 2021 → Jul 23 2021 |
Funding
This work is supported in the U.S. by NASA APRA grants (NNX17AB44G, NNX17AB45G, NNX17AB46G, and NNX17AB47G), in Japan by JAXA/ISAS Small Science Program FY2017, and in Italy by Istituto Nazionale di Fisica Nucleare (INFN) and the Italian Space Agency through ASI INFN agreement No. 2018-28-HH.0: “Partecipazione italiana al GAPS - General AntiParticle Spectrometer”. F. Rogers is supported by the National Science Foundation (NSF) Graduate Research Fellowship under Grant No. 1122374. P. von Doetinchem received support from the NSF under award PHY-1551980. H. Fuke is supported by JSPS KAKENHI grants (JP17H01136 and JP19H05198) and Mitsubishi Foundation Research Grant 2019-10038. K. Perez and M. Xiao are supported by Heising-Simons award 2018-0766. Y. Shimizu receives support from JSPS KAK-ENHI grant JP20K04002 and Sumitomo Foundation Grant No. 180322. Technical support and advanced computing resources from the University of Hawaii Information Technology Services – Cyberinfrastructure are gratefully acknowledged. This research was done using resources provided by the Open Science Grid [29, 30], which is supported by the NSF award No. 2030508.
Funders | Funder number |
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ASI INFN | |
National Science Foundation | 1122374, PHY-1551980 |
National Aeronautics and Space Administration | NNX17AB47G, NNX17AB46G, NNX17AB45G, NNX17AB44G |
Sumitomo Foundation | 180322, 2030508 |
Japan Society for the Promotion of Science | JP17H01136, JP19H05198 |
Agenzia Spaziale Italiana | |
Instituto Nazionale di Fisica Nucleare | |
Japan Aerospace Exploration Agency | |
Mitsubishi Foundation | 2019-10038, 2018-0766, JP20K04002 |
Institute of Space and Astronautical Science |