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Report No.

Double hypernuclei experiment with hybrid emulsion method at J-PARC

Ekawa, Hiroyuki; J-PARC E07 Collaboration*

Double hypernuclei are important probes to study the system with strangeness $$S$$ = -2. A double hypernucleus $${}^{6}_{LambdaLambda}$$He was clearly identified in the KEK E373 experiment. We are planning an upgrade experiment to search for double hypernuclei at the J-PARC K1.8 beam line. In the experiment, the KURAMA spectrometer system will detect $$Xi^-$$ production in the $$(K^-, K^+)$$ reaction on a diamond target. Tracks in SSDs and emulsion will be automatically connected by a hybrid method. This statistics is more than 10 times as high as that of the KEK E373 experiment. Discoveries of more than 10 new double hypernuclear species are expected. On the other hand, we will also observe $$X$$ rays from $$Xi^-$$ atoms with a Germanium detector array. This will be the first measurement in the world and give information on the $$Xi^-$$ potential shape at the nuclear surface region. In this talk physics motivation and current status of the J-PARC E07 experiment will be presented.



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