Directional distributions of beta-rays emitted from polarized 60Co nuclei☆

Abstract The 60 Co nuclei in a thin permendur foil were polarized by a pair of orthogonal magnetic flux loops at ultralow temperatures. The observed angular distribution and the asymmetry factor ( A exp = −1.01 ± 0.02) are in excellent agreement with theoretical predictions of (1 + α cos θ ) dependence and A theory = −1.0.