Which Elements Can be Candidates of Concatenating ββ Decay Nuclear Fuel

With the catalysis of focused neutrinos and other special means, some of those 2β isotopes can be outstood for fuel, provided it becomes possible for 2 sequential events of concatenating β1β2 with total energy Q(β1) + Q(β2) positive balance. This research paper at least proposes molybdenum 100Mo as promising candidate.