Observation of Coulomb-assisted nuclear bound state of -N system

Hayakawa, Shuhei; Fujita, Manami; Hasegawa, Shoichi   ; Hashimoto, Tadashi   ; Hosomi, Kenji  ; Ichikawa, Yudai   ; Imai, Kenichi*; Nanamura, Takuya; Naruki, Megumi; Sako, Hiroyuki   ; Sato, Susumu  ; Tamura, Hirokazu; Tanida, Kiyoshi   ; Yamamoto, Takeshi  ; 84 of others*

In an emulsion-counter hybrid experiment performed at J-PARC, a absorption event was observed which decayed into twin single- hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as NBe + He. For the binding energy of the hyperon in the -N system a value of MeV was deduced. The energy level of is likely a nuclear state which indicates a weak - coupling.