Performance Evaluation of Neutron Polarimeter NPOL

A high performance neutron polarimeter NPOL has been constructed for the measurement of polarization correlation function for the ($d$, $pn[{}^1 S _0]$) reaction for the test of EPR paradox in a system of unlike fermions. The NPOLsystem consists of 12 planes of two-dimensional position-sensitiveneutron detectors with a size of $60 \times 60 \times 3.0 \, \mathrm{cm}^3$. Neutron polarization is determined from the azimuthal distributionof the elastic $\vec{n} + p$ scattering in the scintillator. The effective analyzing power of NPOL have been calibrated by using the polarized neutrons from the ${}^6 \mathrm{Li}(\vec{d},\vec{n})\mathrm{X}$ reaction at $T _d = 270 \,\mathrm{MeV}$. We will report the effective analyzing power and the double scattering efficiency.