Abstract
A comparison of the positron polarization from the decays of $^{25}\mathrm{Al}$ and $^{26}\mathrm{Al}^{\mathrm{m}}$ is reported. A new instrument to perform these measurements has been installed on-line at a cyclotron and is described. The theoretical motivation for this experiment is discussed. Polarization data and results of systematic tests are reported. No difference in polarization was found at the level of 0.48%.
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