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A Possible Origin of e+e- Peaks in Heavy-Ion Collisions

The behavior of a neutral composite particle composed of a positron and an electron in the strong Coulomb field of a nuclear “quasimolecule” formed in low-energy heavy-ion collions is examined. A strong attractive interaction between the composite particle and the Coulomb field is found when the combined nuclear charge of two nuclei is sufficiently large, which is possible to lead to the e+e- pair production in heavy-ion collisions.