A high-efficiency polarimeter for the measurement of the deuteron tensor polarization t20in π+-d scattering

We describe the design and the calibration of a high-efficiency polarimeter which is sensitive to the deuteron tensor polarization t₂₀ and capable of working in a high background. The polarimeter is based on the ³He(d,p) ⁴He reaction, calibrated in the energy range between 10 and 36 MeV; it has an average efficiency of 0.7 × 10 ^-4 and an average analyzing power of T₂₀ = -0.5. The use of this polarimeter to measure the tensor polarization t₂₀ of the recoil deuterons in π⁺-d elastic scattering is described.