Abstract
The angular correlation of the 2-quantum decay of positrons annihilating in a Teflon absorber has been measured at room temperature and at 490\ifmmode^\circ\else\textdegree\fi{}K, in each case with a magnetic field of 10 kilogauss and in the absence of the field. The results are consistent with prediction based on the assumption of conversion between triplet and singlet states of positronium.
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