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We have computed the paramagnetic quenching effect of lithium and sodium in liquid ammonia on the long-lifetime component of positron annihilation. The triplet-to-singlet conversion cross sections, calculated in the Born approximation, turn out to be 5.9×{}10^-14 cm² for Li and 7.2×{}10^-14 cm² for Na for thermalized positronium. Reasonable agreement with the meagre existing experimental data is obtained.
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Majumdar et al. (1967) studied this question.
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