Neutron-rich nickel-78 is doubly magic Nickel-78 is the element's heaviest isotope and is believed to have an important involvement in supernova nucleosynthesis of elements heavier than iron. It's exceptionally stable (decay time in the range of seconds), despite it contains excess of loosely bound neutrons. Protons and neutrons are not identical particles and in the shell model, the nucleus is described by two separate sets of shells, one for protons and one for neutrons. These neutrons are thus displaced outside the atom nuclei into single layer and/or even expel proton to the outside of nucleus.
As more neutrons are added to the element only the neutron shell is filled, and the proton-neutron component of the strong force steers the energies of the orbitals, either closing gaps by bringing the orbitals together or opening new gaps by repelling them from each other. The net result is the appearance and disappearance of magic numbers depending on the size of these gaps.
It should be that active fuel for Lenr doesn't appaer inside Aston's chart.
It may be composite atoms with stronger binding energies than normal.
By losing this excess of "bonds", Lenr restabilizes nucleus components (proton and neutron's order) towards their basal equilibrium (Aston's chart)
This well explains transmutations without XH.