> The D+3He reaction itself produces 4He and a proton
Yes, I made mistake. Thank You.
But this is not making much difference from neutrons from D+T reaction, particles are not too convenient to got energy from their moving.
Much better pure Boron+Carbon reaction, from which energy will go just as photons, for example could be used to feed laser/maser and then convert to electricity by photovoltaic or high frequency power diodes.