  Neutron-rich Sr nuclei around N=60 exhibit a sudden shape transition from
spherical ground state to strongly prolate-deformed. Recently, a lot of new
insight into the structure of Sr isotopes in this region was gained through
experimental studies of excited levels, transitions strengths and spectroscopic
factors. In this work, a "classic" shell-model description of strontium
isotopes from N=50 to N=58 is provided, using a natural valence space outside
the 78Ni core. Both even-even and even-odd isotopes are adressed. In
particular, spectroscopic factors are computed to shed more light on the
structure of low-energy excitations and their evolution along the Sr chain. The
origin of deformation at N=60 is commented in the context of the present and
previous shell-model and Monte-Carlo shell-model calculations.
