  We present results of coupled-channels calculations which are performed to
understand the role of vibrational excitations of the daughter nucleus in
proton emission decay of spherical nuclei. It is shown that the experimental
decay rates from the 2$d_{3/2}$, 3$s_{1/2}$ and 1$h_{11/2}$ states in proton
emitting nuclei $^{160,161}$Re are reproduced simultaneously when the
quadrupole phonon excitation of the core nuclei is taken into account. We apply
the formalism also to the $^{145}$Tm nucleus and show that good agreement is
achieved with the recently measured branching ratio for the fine structure.
