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We suggest a ``ping-pong'' mechanism of enhancement for fusion reactionsbetween a low energy external deuteron beam and the deuterons in a condensedmatter or molecular target. The mechanism is based on the possibility ofacceleration of a target deuteron by the Coulomb field of a projectile deuteronwith its subsequent rebound from a heavy atom in matter and the followingfusion of the two deuterons moving towards each other. This effectivelyconverts the fixed target process into a colliding beam reaction. In a simplelimiting case this reduces the negative penetrability exponent by a factor of$\sqrt{2}$. We also discuss a contribution given by ``zero oscillations'' of abound target deuteron. The proposed mechanism is expected to be efficient incompounds with target deuterons localized in the vicinity of heavy atoms.Comment: 4 page

‘Colliding beam’ enhancement mechanism of deuteron–deuteron fusion reactions in matter