bound system at J-PARC

佐久間 史典*; 橋本 直; 谷田 聖; 他66名*

AIP Conference Proceedings 2249, p.020005_1 - 020005_10, 2020/07

https://doi.org/10.1063/5.0008808

The bound system, symbolically denoted as "", is the simplest -nuclear bound system which has been widely discussed as a consequence of the strongly attractive interaction in channels. Many theoretical works have pointed out the existence of the "" bound system, but the calculated properties such as the binding energy and the width spread out due to the uncertainty of the interaction below the mass threshold. Experimentally, there are several reports on observation of a "" candidate with the binding energy of around 100 MeV, however, no definitive evidence was available so far. At J-PARC, we conducted a experimental search for the "" bound system using He reaction at 1.0 GeV/ where the "" is expected to be directly produced via the reaction. We finally observed a bound state below the mass threshold in the final state, which can be interpreted as the "" bound state. The possible existence of the "" state is discussed from both aspects of production and decay.