Speaker
Description
Multi-strangeness systems, such as $\Xi$ hypernuclei and double $\Lambda$ hypernuclei, are of crucial importance for understanding baryon-baryon interactions and
the nuclear matter equation of state. $Xi$-atoms, where a $\Xi^-$ is trapped in atomic states around a nucleus, is a good playground to investigate the optical potential
a $\Xi^-$ feels in nuclei and thus to study the $\Xi N$ interaction and $\Xi N$-$\Lambda \Lambda$ coupling strength by precise measurements of emitted X rays.
At J-PARC, a series of experiments have been performed to observe X rays from $\Xi$ atoms. First, emulsion nuclides (such as Ag and Br) were used for $Xi^-$ stopping targets as a byproduct of E07 experiment. Additionally, we also searched for $Xi$-C X rays from the diamond target of E07 experiment. Second, in E03 experiment, we are searching for $Xi$-Fe X rays. Presently, E96 experiment is running to observe $Xi$-C X rays by tagging stopped $Xi^-$ in the active scintillation fiber target. I will show (preliminary) results and status of these experiments.
