Many body problems with "spin"-related contact interactions

We study quantum mechanical systems with "spin"-related contact interaction s in one dimension. The boundary conditions describing the contact interact ions are dependent on the spin states of the particles. In particular we in vestigate the integrability of N-body systems with delta -interactions and point spin couplings. Bethe ansatz solutions, bound states and scattering m atrices are explicitly given. The cases of generalized separated boundary c ondition and some Hamiltonian operators corresponding to special spin relat ed boundary conditions are also discussed.