-nuclear bound state at J-PARC

Sakuma, Fuminori*; Hashimoto, Tadashi   ; Tanida, Kiyoshi   ; 66 of others*

-nuclear bound states have been widely discussed as a consequence of the strongly attractive interaction in channels. Especially, the simplest -nuclear bound state of (denoted as "") has attracted the strong interest both of theoretical and experimental studies. We observed a bound state below the mass threshold with in-flight induced reactions on He target, which can be interpreted as the "" bound state. The possible existence of the "" state is discussed from both aspects of production and decay: "" and productions, and non-mesonic and mesonic decays, respectively.