Study Of Double-Λ Hypernuclei at J-PARC

At J-PARC, we will carry out the E07 experiment with the emulsion-counter hybrid method. By E07, nearly 10 events of double-hypernuclei are expected to be studied for 10 Ξstopping events in the emulsion via the (K-, K) tagging. X-rays are also measured to understand Ξ-N strong interaction by the energy shift from the electro-magnetic interaction for the Ξstopping events. After those studies, the overall scanning method will be applied for all emulsion plates. According to the results of the previous experiments [1, 2, 3, 4], we can expect to analyze 10 events of double-hypernuclei and one million events of single-hypernuclei as well in all of the emulsion, if we are free from counter information. To realize those analyses, a development of quite fast detection system for the typical events is on-going.