Kaonic atom experiments at J-PARC

Hashimoto, Tadashi   

X-ray spectroscopy of kaonic atom is a powerful tool to investigate the K N interaction and K nucleus interaction at zero kinetic energy. Using a high-intensity kaon beam at J-PARC, we are conducting two kaonic atom experiments. One is to determine the strong-interaction-induced 2p shift in kaonic helium-3 and -4 with a precision to sub eV by a novel cryogenic X-ray detector, to distinguish existing potential models. The other one aims at the first obserbation of 2p to 1s transition X-rays from kaonic deuterium, to resolve the isospin dependent interaction together with kaonic hydrogen data. In this contribution, we will present the latest results from koanic helium experiment performed in June, 2018, and the outlook toward the kaonic deuterium experiment.