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

TL;DR

This study investigates deuteron-proton charge exchange at 726 MeV, measuring analyzing powers and spin correlations to test neutron-proton interaction models and partial-wave solutions.

Contribution

It provides high-precision measurements of spin observables in deuteron-proton charge exchange at intermediate energy, supporting current neutron-proton partial-wave analyses.

Findings

Data agree with impulse approximation calculations

Results support existing neutron-proton partial-wave solutions

Analysis reveals interference effects in charge-exchange amplitudes

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 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 Tn ~ 1/2 Td =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.