Effect of paramagnetic impurity on the long lifetime of positron in liquid ammonia

Majumdar, Chanchal. K. ; Chindhu, S. Warke (1967) Effect of paramagnetic impurity on the long lifetime of positron in liquid ammonia Physical Review, 162 (2). pp. 247-253. ISSN 0031-899X

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Official URL: http://prola.aps.org/abstract/PR/v162/i2/p247_1

Related URL: http://dx.doi.org/10.1103/PhysRev.162.247

Abstract

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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