I'm so sorry, but you don't split (fission) helium to get energy. You combine (fusion) helium to get energy. You split something heavy like uranium to get energy.
I hate that stupid physics ruins this very good joke :/
Xenon and Krypton are noble gasses that are produced from fission, but I don't think they're ever the pre-guillotine input.
The point is the "energy well". That is the elements "in the middle" of the periodic table are more stable/at lower energy states. So fusioning heavy elements or fissioning light elements move to higher energy states, so it will take more energy in than it releases.
Perhaps I want clear. If you split helium, you lose energy. You have to go above iron if want to release energy from fission (mostly).
But a guillotine doesn't deliver more energy that a nuclear explosion. Given the endothermic nature of splitting helium it would have do the splitting and the exploding.
