11-13 November 2019
The University of Tokyo, Kashiwa Campus
Asia/Tokyo timezone

The GAPS experiment: sensitive survey of cosmic-ray antinuclei to search dark matter

12 Nov 2019, 12:00
The University of Tokyo, Kashiwa Campus

The University of Tokyo, Kashiwa Campus

Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba, Japan
Board: 1
Poster DM Indirect Detection Poster short presentations


Takuya Wada on behalf of the GAPS collaboration (Aoyama Gakuin University)


The General Antiparticle Spectrometer (GAPS) is an international balloon-borne project for indirect dark matter (DM) searches that investigates low-energy antinuclei in cosmic-ray, especially undiscovered antideuterons. Cosmic-ray antideuterons can be produced by self-annihilation or decay of WIMP DM. The flux of DM-originated antideuterons can be orders of magnitude higher than that of the secondary (or background) component. Therefore, antideuterons are considered to be a background-free probe to search for DM. GAPS uses a unique concept to identify antinuclei by applying the physics of exotic atom creation and decay. The GAPS instrument is composed of lithium-drifted silicon (Si(Li)) detectors surrounded by a double-layered plastic scintillation-counter time-of-flight system. An incoming antinucleus forms an exotic atom in the Si(Li) detectors. Through the deexcitation and nuclear annihilation processes of the exotic atom, characteristic X-rays and charged particles are emitted. By detecting and tracking those X-rays and particles, GAPS has strong particle identification, resulting in a high sensitivity for rare antinuclei. The first GAPS flight is scheduled for late 2021. We are currently developing all different subsystems, such as the Si(Li) tracker, time-of-flight system, cooling system, and detailed simulation code of the instrument. We will report the scientific motivation, detection concept, and development status of GAPS.


Aoyama Gakuin University

Primary author

Takuya Wada on behalf of the GAPS collaboration (Aoyama Gakuin University)

Presentation Materials