delt0r wrote: Note we are not talking about the fusion cross section (reaction rate) that’s dominated by tunneling and the electric force, we are talking about the branching ratio “after” a fusion event that’s dominated by the strong force.

Yes, that’s right. I forgot about this, heh… So, I conclude that Lerner is counting the total energy yield, which is diagnosed by the number of neutrons. Given that tritium is completely consumed in the fusion, or otherwise Lerner would have noticed radioactive waste, we have that:

17.6MeV from D-T + neutron ( 14.1 MeV)

7.3 MeV from D-D + neutron ( 2.45MeV)

So, that is 24.9 MeV for every 2 neutrons, which gives 12.45 MeV per Neutron.

This is close to the D-T neutron yield, so for final energy collection, this is almost the same as collecting neutrons from D-T, meaning, within the range of the final objective, around 33KJ.