The breakup of 9Be is studied via an inelastic scattering experiment on a proton
target at 5.6 A MeV in inverse kinematics. Two of the three cluster constituents (α and α)
as well as the proton target recoil were recorded in a triple coincidence mode allowing a full
kinematics approach analysis. In this respect relative α - α and α - n, Q-value and 9Be excitation
spectra, energy spectra for all fragments as well as the energy spectrum of the recoil proton
were reconstructed. A clear signature of the two breakup sequential modes (5He + 4He and
8Be + n) was identified via the recoiling proton reconstructed spectra together with the direct
breakup decay. A strong 5He + 4He mode was observed compatible with previous beta decay
experiments