legend wrote:Sure, but the kinetic energy includes the kinetic energy of the neutrinos. Since you can't absorb the neutrinos, you can't really reuse the energy for something useful, so it's "lost". If you really want to use antimatter as fuel, I think antihydrogen is still your best bet, simply because it's really difficult to store large amounts of charged particles in a reasonable amount of space.
It seems to me that storing large amount of uncharged antimatter is even more difficult.
mfb wrote:Well, my argument was just that "neutrinos remove a part of the energy" does not matter.
For radiation therapy, yes. For rocket fuel, it matters quite a lot.
mfb wrote:You can shoot anti-protons from outside,
I can't find it on google, but I vaguely remember the CERN organising some sort of contest to decide who they would give an old particle accelerator, that an hospital won, and that they were using it to emit positrons with the right energy, so that they would disintegrate inside the tumor. I read that years ago, and don't remember the details, so true story might be quite different. Also a quick google search didn't give any results