Result of the atomic X-ray measurement at J-PARC E07

Fujita, Manami

atomic X-ray spectroscopy is a useful method for understanding the strong interaction in the S=-2 sector. One of the experimental difficulties is that the in-flight decay of hyperon makes a huge background. We introduced a selection of -stop events using a nuclear emulsion, expecting a clean X-ray spectrum with a good significance. We performed the first atomic measurement with a counter-emulsion hybrid method at the J-PARC K1.8 beam line (J-PARC E07). hyperons were produced via the reaction. The magnetic spectrometers and silicon strip detectors analyzed the production of hyperon and tracks. The prediction of the position where hyperon hit at the emulsion surface by counters shortened the time for the emulsion image analysis. The atomic X rays were measured by the germanium detectors array, called Hyperball-X. We show the Ag and Br atomic X-ray measurement results at J-PARC E07 experiment.