parapositronium


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parapositronium

[¦par·ə‚päz·ə′trō·nē·əm]
(particle physics)
The state of positronium in which the positron and electron have antiparallel spins.
References in periodicals archive ?
Other positrons capture electrons from gas atoms thus producing orthopositronium and parapositronium (in ratio 3:1).
12] s, which is a few orders of magnitude less than those of the positron and parapositronium.
T]Ps [arrow right] nothing, because products of decay passed into the mirror Universe can not be detected; (2) the ratio between orthopositronium and parapositronium numbers will decrease from [sup.