Test experiments are reported illustrating the potential of the HMI Binary
Reaction Spectrometer (BRS) as a reaction channel filter for gamma-ray spec
troscopy with binary exit channels. The BRS, developed as an ancillary dete
ctor for EUROBALL, was tested with the smaller gamma-detector array OSIRIS.
For correlated detection of two heavy ejectiles the BRS combines two large
-area, fourfold segmented gas detector telescopes in a kinematic coincidenc