The nuclei 91Sr and 92Sr were produced at high spin as fission fragments following the fusion reaction 36S+ 159Tb at 165 MeV. γ rays were detected with the Gammasphere array. The level schemes of 91Sr and 92Sr were extended up to E≈6 MeV and E≈8 MeV, respectively. Level structures in 91Sr and 92Sr were interpreted in shell-model calculations performed in the configuration space (0f5/2, 1p3/2, 1p1/2, 0g9/2) for the protons and (1p1/2, 0g9/2, 1d5/2) for the neutrons. Negative-parity states in the yrast sequences are described in these calculations by coupling 3- proton excitations to the unpaired 1d5/2 neutrons. A possible reduction of the gap between the proton 1p3/2 and 1p1/2 orbitals in 92Sr is discussed
