Abstract
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 Td=726 MeV. By selecting two fast protons at low relative energy Epp, 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 Tn≈12Td=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 Epp and the momentum transfer. This lends broad support to the current neutron–proton partial wave solution that was used in the estimation.
Highlights
The charge exchange of vector polarised deuterons on a polarised hydrogen target has been studied in a high statistics experiment at the Cooler Synchrotron (COSY)-ANKE facility at a deuteron beam energy of Td = 726 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
Summary
Analysing powers and spin correlations in deuteron–proton charge exchange at 726 MeV. Ficult to determine and values may only be obtained indirectly through combinations of other measurements It was shown several years ago [3] that, at small momentum transfers between the deuteron and the diproton, the tensor analysing power in the deuteron charge exchange on hydrogen, dp → {pp}sn, is closely linked to the spin transfer in neutron– proton large angle scattering, pn → np, provided that the excitation energy E pp in the final diproton is very low. From studying the φ dependence of the count rates for the four combinations of beam and target polarisations it is possible to extract separately the values of the proton and deuteron vector analysing powers as well as the two spin correlations.
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