The problem here again is that deuterium is very unlikely due to nuclear processes, and that collisions between atomic nuclei are likely to result either in the fusion of the nuclei, or in the release of free neutrons or alpha particles.
Igen er problemet, at deuterium er meget følsomt over for nukleare processer, hvorfor kollisioner mellem atomkerner med stor sandsynlighed enten medfører absorption af kernerne eller udsendelse af fri neutroner eller alfapartikler.