Well, while you can in principle do something, an accelerator is a pretty blunt instrument. You're unlikely to have practical success putting Krypton, Barium an

Well, while you can in principle do something, an accelerator is a pretty blunt instrument. You're unlikely to have practical success putting Krypton, Barium and a few neutrons together into a Uranium nucleus even if it's theoretically possible. The phase space for the reaction is just not there. Chemistry has a lot more tricks for synthesizing molecules than just shooting them at each other.