The wave functions of a number of positron-atom complexes are analyzed and three of the systems, namely, e⁺Be, e⁺Na, and e⁺He(³Sᵉ), are seen to exhibit quantum halo structures with 45%--50% of their probability distribution lying in the large r classically forbidden region. The mean square distance between the large r fragments (e⁺+Be, Ps+Na⁺, Ps+He⁺) for these systems range from 1.8 to 2.2 times larger than the square of the classical turning point, another indication of their halolike nature.
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J. Mitroy (2005) studied this question.
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