The Letts-Cravens experiment is described by M. Srinivasan in his Report on the ICCF-10 (accomplished in August-2003). At the end of the experiment?s description, Srinivasan says: ?Several theoreticians are presently trying to model the possible mechanism of coupling between the laser and the deuterium loaded lattice?. However, what sort of models can be tried? As it is known, according to Quantum Mechanics cold fusion cannot exist. Therefore, for the explanation of the results obtained in several cold fusion experiments, it is necessary to introduce new principles missing in Quantum Mechanics. However, only new principles are not enough for the enterprise. Actually cold fusion needs a new model of neutron, a new nuclear model, and a new hydrogen model of atom. New principles are proposed in the author?s Quantum Ring Theory, as for instance the spin-fusion, the accordion-effect, the contraction of the ether, etc. The main models proposed are the following:
- a new model of neutron n=p+e, where the electron is tied to a quark up of the proton through the spinfusion phenomenon,
- a New Nuclear Model of Hexagonal Floors, where the accordion-effect is responsible by several nuclear properties, as for example the changing of the nuclei distortions, measured by the nuclear electric quadrupole moment.
- a new hydrogen atom, where the contraction of the ether works into the electrosphere. Here we analyze how these models, working by new principles, can help us understand the results obtained in the Letts-Cravens experiment.