Measurement of the neutron proton spin correlation parameter Axz

The n-p spin correlation parameter Azx was measured at an energy
of 66:24 MeV and 5 angles in the range of 25o¡46o CM with a statistical
accuracy better than 0:01.
In the measured range, Azx is most sensitive to ²1, the mixing parameter
of the deuteron states 2S1 and 2D1. Therefore the measurement
is expected to reduce significantly the uncertainties of the phases in the
energy range below 100 MeV, when a new global Phase Shift Analysis
(PSA) is performed. This should help to find a more accurate answer to
the strength of the tensor force in the NN-interaction.
The experiment was performed in the low energy area C (NEC) of
the Paul Scherrer Institute (PSI) in Villigen, Switzerland.