Analysing powers and spin correlations in deuteron–proton charge exchange at 726 MeV

The charge exchange of vector polarised deuterons on a polarised hydrogen target has been studied in a high statistics experiment at the COSY-ANKE facility at a deuteron beam energy of T_d=726 MeV. By selecting two fast protons at low relative energy E_pp, the measured analysing powers and spin correlations are sensitive to interference terms between specific neutron–proton charge-exchange amplitudes at a neutron kinetic energy of T_n≈1/2 T_d=363 MeV. An impulse approximation calculation, which takes into account corrections due to the angular distribution in the diproton, describes reasonably the dependence of the data on both E_pp and the momentum transfer. This lends broad support to the current neutron–proton partial wave solution that was used in the estimation.