  Fission and gamma-emission probabilities induced by transfer or inelastic
scattering reactions with light projectile nuclei are very valuable quantities
for constraining the models that describe the de-excitation of heavy nuclei. We
have developed an experimental set-up that allows us to simultaneously measure
fission and gamma-emission probabilities. The measurement of the gamma-emission
probability at excitation energies where the fission channel is open is
challenging due to the intense background of gamma rays emitted by the fission
fragments. We discuss the procedure to subtract such a background and the
constraints that this subtraction and other experimental conditions put on the
set up. We show that our set-up complies with these constraints.
