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

Abstract

International audienceThe 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 MeVTd=726 MeV. By selecting two fast protons at low relative energy EppEpp, 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 View the MathML sourceTn≈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 EppEpp and the momentum transfer. This lends broad support to the current neutron–proton partial wave solution that was used in the estimation

Partial-wave analysis of nucleon-nucleon elastic scattering data

“…The nucleon-nucleon interaction is fundamental to the understanding of nuclear physics as a whole. The elastic scattering of protons and neutrons, at low to medium energies, can be analyzed in terms of a partial-wave expansion, yielding amplitudes that are valuable for comparison to models [1] and also as input to more complex processes, such as proton-deuteron scattering [2] and deuteron electro-disintegration [3]. Fit results have also been used in Monte Carlo simulations and incorporated into geometry and tracking of the Geant4 simulation [4] software, a basic tool for low, medium, and high energy groups.…”