A method for optimizing controlled nuclear fusion in an unstructured target using low-energy particles (e.g., hydrogen) is discussed. The main idea of the method is the use of quasi channeling of such particles in a thin single-crystal film of a graphene type located near the surface of an unstructured target made of an optimal isotope for fusion (e.g., natural Li). Such motion at an optimum particle energy of approximately 500 eV leads to the formation of a coherent correlated state of these particles with very large fluctuations of the transverse energy up to 50 to 100 keV in this film and in the adjacent part of the target. The interaction of these particles with target nuclei leads to the stimulation of effective nuclear fusion p(Li7,α)He4.