Measuring the linear polarization of $\gamma$s in 20-170 GeV range
G. Unel (for the Na59 Collaboration)
TL;DR
This paper reports on the measurement of linear polarization of high-energy gamma rays using aligned crystal targets, achieving a polarization degree of 55% near 70 GeV, which advances photon polarization measurement techniques.
Contribution
It introduces a method to measure gamma-ray polarization in the 20-170 GeV range using pair production in aligned crystals, demonstrating its effectiveness.
Findings
Photon polarization of 55% at ~70 GeV
Use of germanium and diamond crystal targets
Validation of polarization measurement technique
Abstract
The Na59 collaboration aims to measure the linear polarization of its photon beam in the 20-170 GeV range, using an aligned thin crystal. The tracks of pairs created in two different crystal targets, germanium and diamond, are reconstructed to obtain the photon spectrum. Using the polarization dependence of the pair production cross section in an aligned crystal, photon polarization is obtained to be 55% at the vicinity of 70 GeV.
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