“KMI colloquium” 22th Feb (THU)  17：00 – 
Speaker: Kohei Yorita (Waseda University)
Title: Cosmic Antimatter Search with Balloon-Borne Liquid Argon TPC – The GRAMS Experiment
Place: ES635& ZOOM

Abstract:

This talk introduces the Gamma-Ray and Anti-Matter Survey (GRAMS) experiment, which aims to observe cosmic antiparticles and MeV gamma rays simultaneously by deploying a Liquid Argon Time Projection Chamber (LArTPC) on a balloon at high altitude.

Particularly, the investigation of antideuterons in cosmic rays with rigidity below 1 GeV/n is promising for exploring new phenomena, including dark matter, due to very low flux from secondary backgrounds. However, various challenges such as the development of LArTPC technology, establishment of safety operation on a balloon, and a detailed understanding of annihilation phenomena with Ar nuclei need to be addressed.

Aiming for a long-duration flight at 38 km above the Antarctic in the 2020s, engineering flight in JAXA TARF was performed in summer 2023 and accelerator antiparticle beam tests have been proposed to the J-PARC.

In this seminar, brief overview of antimatter survey, GRAMS project status and its future prospects will be presented.