The inclusive and exclusive reactions have been studied with a beam energy of 171 MeV and scattering angles for the reaction and 3°. The studies focused on the separation of the isovector spin-dipole resonance (IVSGDR) into its components by measuring tensor-analysing powers and observing the direct neutron decay to the low-lying proton-hole states in 11B. Merging the information obtained from both measurements resulted in the first-time verification of model-independent predictions of tensor-analysing powers at extreme forward angles and the experimental decomposition of the IVSGDR into its components. The experimental results are in reasonable agreement with theoretical estimates based on shell-model calculations.