Overview

The Positron Polarimeter will be used to measure the longitudinal polarization of beta particles emitted by highly-polarized Na-21 and Mg-23 nuclei to search for deviations from maximal parity violation. The system will also serve to perform relative asymmetry measurements from mirror-transitions to determine the Gamow-Teller-to-Fermi mixing ratio, which is a crucial property for the extraction of the semi-leptonic weak strength.

Technical detail

The Positron Polarimeter consists of a pair of identical superconducting solenoids, with each solenoid capable of producing a maximum field of 2 T. The solenoid will have a warm bore, with an inner diameter of 22 cm to accommodate detector arrays. The polarimeter will be installed downstream of the BECOLA facility.

Funding acknowledgement: The construction of the Positron Polarimeter was funded by the National Science Foundation through NSCL cooperative agreement PHY-1102511.