Future projects of light kaonic atom X-ray spectroscopy

Abstract

Abstract. X-ray spectroscopy of light kaonic atoms is a unique tool to provide precise information on the fundamentalKN interaction at the low-energy limit and the in-medium nuclear interaction of K − . The future experiments of kaonic deuterium strong-interaction shift and width (SIDDHARTA-2 and J-PARC E57) can extract the isospin dependent K − N interaction at threshold. The high-resolution X-ray spectroscopy of kaonic helium with microcalorimeters (J-PARC E62) has the possibility to solve the long-standing potential-strength problem of the attractive K − -nucleus interaction. Here, the recent experimental results and the future projects of X-ray spectroscopy of light kaonic atoms are presented.

First measurement of kaonic helium-4 M-series transitions

“…The study of kaonic helium is a topic of great interest [20], concerning both the x-ray energies and yields. Koike and Akaishi [21] developed a cascade model for kaonic helium, which reproduced the experimental data measured at liquid helium-4 density, but failed to match the data from the SIDDHARTA experiment [22], which included measurements at various gas densities.…”