The ⁹⁸Mo (¹⁶O, xn) reaction has been used to study the level structure of the semi-magic nuclei ¹¹⁰₅₀Sn, ¹¹¹₅₀Sn and ¹¹²₅₀Sn. The OSIRIS-II array equipped with 10 HPGe detectors with anticompton shields was used in conjunction with an 48-element BGO multiplicity filter. The experiments performed with projectile energy E_^{16}{O}=60--80 MeV brought results on relative excitation functions, \gamma -ray angular distributions, as well as on \gamma --\gamma and \gamma -t_RF coincidences. The measurements include also \gamma -ray multiplicity and total energy data as well as the investigations of radioactive decays. The selected results on the properties of excited states in the studied nuclei are reported. In particular, the evidence for a neutron-core coupling in ¹¹¹Sn, and the extension of the intruder and negative parity bands in ¹¹⁰Sn and ¹¹²Sn nuclei are presented.

PACS numbers: 27.60.+j