In-medium properties of meson

Using the Crystal Barrel(CB)/TAPS detector system at the ELSA accelerator facility in Bonn the η ′ photoproduction off nuclei (C, Ca, Nb and Pb) was studied via the hadronic decay channel η ′ → π 0 π 0 η . Recent results on the in-medium properties of the η ′ -meson, derived from the transparency ratio measurements, are presented. The absorption of the η ′ -meson in nuclear matter is compared to the properties of other mesons ( η and ω ).