What is the smallest possible yield for a nuclear explosive? In other words, what’s the smallest possible mass required to become critical? Could you build a nuclear bomb with the explosive force of a grenade, for example?
I understand generally how a nuclear fission reaction occurs, and I’m guessing that the answer has to do mainly with the fissile material used; it takes a minimum X amount of plutonium to generate fission, etc. etc.
But does anybody know what the actual equation for this would be?