  In many crystals with sufficient anharmonicity, a special kind of lattice
vibrations, namely, discrete breathers (DBs) can be excited either thermally or
by external triggering, in which the amplitude of atomic oscillations greatly
exceeds that of harmonic oscillations (phonons). Coherency and persistence of
large atomic oscillations in DBs may have drastic effect on quantum tunneling
due to correlation effects discovered by Schrodinger and Robertson in 1930.
These effects have been applied recently to the tunneling problem by Vysotskii
et al, who demonstrated a giant increase of sub-barrier transparency during the
increase of correlation coefficient at special high-frequency periodic action
on quantum system. In the present paper, it is argued that DBs present the most
natural and efficient way to produce correlation effects due to time-periodic
modulation of the potential well width and hence to act as breather
nano-colliders (BNC) triggering low energy nuclear reactions (LENR) in solids.
Tunneling probability for deuterium (D-D) fusion in gap DBs formed in metal
deuterides is shown to increase drastically with increasing number of
oscillations resulting in the observed LENR rate at extremely low
concentrations of DBs. Possible ways of engineering the nuclear active
environment based on the present concept are discussed.
