Spectroscopy of η'-mesic Nuclei with WASA at GSI/FAIR

We plan to conduct an experimental search for η′-mesic nuclei in order to investigate in-medium properties of the η′ meson. A 2.5 GeV proton beam is employed to produce η′-mesic 11C nuclei with the 12C(p,d)η′⊗11C reaction. Simultaneous measurements of the forward ejected deuterons and decay protons from η′-mesic nuclei will allow us to achieve high experimental sensitivity. The experiment will be performed at GSI by making full use of the fragment separator FRS and the WASA detector system. The plan of this proposed experiment is described.