  We study the resonant dipole-dipole interaction energy between two uniformly
accelerated identical atoms, one excited and the other in the ground state,
prepared in a correlated {\em Bell-type} state, and interacting with the scalar
field or the electromagnetic field nearby a perfectly reflecting plate. We
suppose the two atoms moving with the same uniform acceleration, parallel to
the plane boundary, and that their separation is constant during the motion. We
separate the contributions of vacuum fluctuations and radiation reaction field
to the resonance energy shift of the two-atom system, and show that Unruh
thermal fluctuations do not affect the resonance interaction, which is
exclusively related to the radiation reaction field. However, nonthermal
effects of acceleration in the radiation-reaction contribution, beyond the
Unruh acceleration-temperature equivalence, affect the resonance interaction
energy. By considering specific geometric configurations of the two-atom system
relative to the plate, we show that the presence of the mirror significantly
modifies the resonance interaction energy between the two accelerated atoms. In
particular, we find that new and different features appear with respect to the
case of atoms in the free space, related to the presence of the boundary and to
the peculiar structure of the quantum electromagnetic field vacuum in the
locally inertial frame. Our results suggest the possibility to exploit the
resonance interaction between accelerated atoms, as a probe for detecting the
elusive effects of atomic acceleration on radiative processes.
