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This is a normal post Something to do with supernovae
As you infer, "normal" fusion reactions in stellar cores, even super-massive ones, are not sufficiently energetic to produce the heavier elements alone. It requires the mind bogglingly huge energies present in a supernova to synthesise elements heavier than bismuth.
SCIENCE!
 (I helped save b3ta! P-MONKE We're all fucked, Tue 13 Mar 2012, 15:45, Reply)
This is a normal post Ta!
So collapsing isn't enough? There has to be an explosion too?

Hmmm...
 (I helped save b3ta! Enzyme is powered by sunlight, Tue 13 Mar 2012, 15:48, Reply)
This is a normal post
The collapse is what causes the explosion.
 (BombayMick Dogs are better than cats, Tue 13 Mar 2012, 16:10, Reply)
This is a normal post Yeah: I know that.
But not all collapsing stars explode, do they? I heard somewhere that ours probably won't because it's not massive enough. It'll just go into retirement and eventually fade away, without ever producing a single atom of ruthenium.
 (I helped save b3ta! Enzyme is powered by sunlight, Tue 13 Mar 2012, 16:15, Reply)
This is a normal post
Yes, if it's big enough, apparently it does this collapse and then 'bounce' out - the atoms being at greater pressure fuels the hotter reaction (I think).
 (BombayMick Dogs are better than cats, Tue 13 Mar 2012, 16:30, Reply)