Re: That's a good question!
Will an antihydrogen atom annihilate with an antiplutonium atom? I hadn't thought of that before! Wicked cool concept. I suppose antiprotons annihilate against their storage container which is probably made of something other than hydrogen....
I was just thinking that heavier anti-nucleons with an electrostatic charge could be stored at the same density as lighter anti-nucleons, effectively increasing the energy storage density.