J-PARC E27 experiment to search for a nuclear Kaon bound state

Imai, Kenichi; Ichikawa, Yudai   ; Hasegawa, Shoichi   ; Sako, Hiroyuki   ; Sato, Susumu  ; Kiuchi, Ryuta*; Hosomi, Kenji  ; Sugimura, Hitoshi; 36 of others*

In the J-PARC E27 experiment, we search for a bound state via the reaction at 1.7 GeV/c at the K1.8 beam line. The binding energy and decay width of the bound state can be obtained in the missing mass measurement with a good energy resolution of 2 MeV/c. A range counter array (RCA) was constructed to detect the two high-momentum protons from the decay and to reduce the background such as quasi-free hyperon production. Recently, we have carried out a pilot run in June, 2012. The missing-mass spectrum has been obtained for the first time.