Shape coexistence and possible isomers in 117Sn

Excited states of [Formula: see text]Sn have been populated using the fusion-evaporation reaction [Formula: see text] at a beam energy of 48[Formula: see text]MeV. A total of nine new transitions have been identified and added into the level scheme of [Formula: see text]Sn. Based on the systematical comparisons with the neighboring Sn isotopes and the configuration-fixed constrained triaxial relativistic mean-field (RMF) calculations, a collective structure and two isomers are proposed to exist in [Formula: see text]Sn. The phenomenon of shape coexistence has been extended to [Formula: see text] = 117 in odd-[Formula: see text] Sn isotopes for the first time.