Reaction (dpol,2He) at intermediate energies

We have succeeded in measuring at 0° and small angles the energy spectra for the (d,2p${[\mathrm{}}^1$ $S_0$]) reaction (with the two protons in the singlet S state) at 650 MeV and 2 GeV. It is demonstrated that the reaction is a one-step process that can be used to study isospin-spin excitations. The Δ excitation is very clearly observed. A shift down in energy of the Δ peak from the proton to the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ target is observed. The experiments are performed with a tensor polarized beam and the tensor analyzing power for the p($d_{\mathrm{pol}}$,${\mathrm{}}^2$He)n reaction at 2 GeV is given.