Delta excitation in inelastic scattering of nucleons on nuclei

We outline an elegant way of deducing the spin structure of any reaction A(a,b)B with arbitrary spins s(A), s(a), s(b), s(B) and apply the same to NN-->N Delta, taking into consideration the Pauli exclusion principle. This method, based on irreducible tensor techniques is then extended to a excitation in A(N,N'pi )B by considering the target excitation process (TDP) as A(N,N')B-Delta* followed by B-Delta*-->B+pi and the projectile excitation process (PDP) as A(N,b)B followed by Delta-->N'pi. Expressions for the double differential cross section and inelastic nucleon spin observables are given, which are of current experimental interest.