Abstract
Based on a three-body formulation of a nuclear reaction, we show that a new type of long-range interaction can exist in the imaginary part of the effective potential for nuclear reactions if the final-state nucleus has an excited neutron-core halo state. The existence of such a long-range interaction can lead to an enhancement of the nuclear cross section. Comparison of the new long-range effective interaction with other previously known ones is given. \textcopyright{} 1996 The American Physical Society.
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