–
•“Unfortunately”
2He isn’t stable
–To
get stable He need to add one or two neutrons to:
•Increase
Strong Force, without increasing Coulomb force
–Not
really “unfortunate” – If 2He were stable:
•Sun
would burn energy way too fast – and would have gone out by now
–
•Weak
force converts proton to neutron–fusion will be slow
–In
solar fusion no excess neutrons lying around
–Hydrogen
bombs use deuterium: 2H = (p+ n) or tritium: 3H = (p+ n n) to provide
it