New Cooperative Mechanisms of Low Energy Nuclear Reactions Using   Superlow Energy External Fields
  We proposed a new mechanism of LENR: cooperative processes in whole system - nuclei+atoms+condensed matter can occur at smaller threshold then corresponding ones on free constituents. The cooperative processes can be induced and enhanced by low energy external fields. The excess heat is the emission of internal energy and transmutations at LENR are the result of redistribution inner energy of whole system. 
F. A. Gareev, I. E. Zhidkova