The authors would like to acknowledge the GSI accelerator staff for their support in the experiment. This work is partly supported by the JSPS Grants-in-Aid for Early-Career Scientists (grant No. JP20K14499) and for Scientific Research (B) (grant No. JP18H01242), JSPS Fostering Joint International Research (B) (grant No. JP20KK0070). The authors would like to acknowledge support from the SciMat and qLife Priority Research Areas budget under the program Excellence Initiative-Research University at the Jagiellonian University, from Proyectos I+D+i 2020 (ref: PID2020-118009GA-I00), from the program “Atracci´on de Talento Investigador” of the Community of Madrid (grant 2019-T1/TIC-131), the Regional Government of Galicia under the Postdoctoral Fellowship Grant No. ED481D-2021-018, the MCIN under grant No. RYC2021-031989-I, and from the European Union’s Horizon 2020 research and innovation programme (grant No. 824093). This work is also supported by RIKEN Junior Research Associate Program

We conducted an experimental search for η'-mesic nuclei, bound systems of an η' meson and a nucleus, in 12C(p, dp) reactions. We measured the missing mass in the (p, d) reaction to obtain the mass spectrum of the reaction product near the η' emission threshold. Forward-emitted deuterons were momentum-analyzed in the FRS of GSI. We installed a nearly 4π detector WASA near the 12C target to effectively select formation and decay of the η'-mesic nuclei. We are presently finalizing the analysis.

5 pags., 3 figs. -- Colloquia: HADRON 2023

Peer reviewed