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Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
From which "Möller had previously explored in detail only the fission of nuclei heavier than mercury, which tend to split symmetrically. But after the ISOLDE result, he applied his model to lighter isotopes and was surprised to find that it predicts asymmetric splits for mercury-180 as well as for a range of other unstable nuclei."
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I'm not sure what you intend, Bored Chemist, by that extract from the Nature article.
My reference to the article was intended as a direct response to your question "Why would you expect 50:50."
The reason I would have expected it, but for this new discovery, is as given in the article here:
...when researchers on the ISOLDE experiment at CERN, Europe's particle-physics laboratory in Geneva, Switzerland, set out to study the fission of mercury-180 — containing 80 protons and 100 neutrons — they expected it to break into two nuclei of zirconium-90, each containing 40 protons and 50 neutrons. They assumed that outcome would be particularly favoured because 40 and 50 are magic numbers for which shells would be exactly filled.
But the mercury dealt a surprise, splitting instead into ruthenium-100 and krypton-80. 'A symmetric split should be dominant and we show that it doesn't happen,' says ISOLDE member Andrei Andreyev, presently of the University of the West of Scotland in Paisley. "
I am sorry if I failed to make myself clear by not highlighting the above in my original response.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
But they also found a different (presumably better) model that did predict an unsymmetrical split. So, now they have an experimental result which lets them choose one model rather than the other. That's the way science works. Scientists shouldn't be very surprised if it turns out that one of their models is wrong.
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Mercury isotope ratio change in CFLs
