|WikiProject Elements / Isotopes||(Rated Start-class, Low-importance)|
Could this article state somewhere that isotopes with odd numbers of nucleons tend to be less stable, and thus more fissile, than those with even numbers because of nucleon pairing? The casual but curious reader is left wondering why the fissile isotopes tend to have an odd mass-number. I am not an expert myself, but I understand this is one the reasons. Another article on plutonium also does not mention this. Jimpd (talk) 10:53, 30 March 2011 (UTC)
considering this is the material that was used in the Little boy bomb, it carries quite a historical notoriety... the page seems quite small all things considered. surely there is someone who can elaborate?
Pstanton 04:42, 1 June 2007 (UTC)
- Could you be more specific? A lot is in the linked related articles like Little Boy, Manhattan Project, Nuclear weapons design, Uranium, Uranium enrichment etc. --JWB 18:40, 1 June 2007 (UTC)
What is known about the 5% of the fission energy of 235 going off as neutrinos? That would be a large mass-conversion into neutrino's and produce humongous numbers, most of which would pass through the earth. Seems thermodynamically inefficent as there would be effectively (almost) 0% energy capture/remass conversion. Where does all that momentum go? My guess is a topologic displacement. Sounds symmetry breaking.188.8.131.52 (talk) 07:38, 25 November 2007 (UTC)
I corrected inexact data and the energy units conversions of amount of energy released in nuclear fission event. I attached a table with exact values too. —Preceding unsigned comment added by 184.108.40.206 (talk) 11:46, 1 February 2009 (UTC)
The statement "It is the only fissile isotope found in any economic quantity in nature." needs a reference. I don't think its true, Thorium has fissile isotopes, although the techknology has not been developed, see Thorium fuel cycle, and http://www.thoriumpower.com/. Pulu (talk) 18:48, 6 November 2008 (UTC)
- Thorium is fertile, not fissile. I.e. Th-232 can be bred to U-233, which is fissile.
- —WWoods (talk) 21:33, 6 November 2008 (UTC)
Fission and Decay
The article is very confusing, as the two nuclear processes are not clearly distinguished. The half-life of uranium is about its rate of decay, which is quite different from its ability to undergo fission. Decay occurs, with a half-life of ~700 mYrs, irrespective of anything in the environment (like neutrons), and goes to thorium-234 and eventually to lead, with a mixture of alpha and beta emissions (no neutrons) as described in the Wiki article on decay chain. Fission has no half-life, its rate depends on how many neutrons are around, and its products and emissions are completely different from those of decay. Fission tends to get the attention, but decay is important to us as the heat generated from radioactive decay, mostly U-235, drives the convection currents within the earth and thus plate tectonics. I have enough physics to see the problem but not to fix it. Someone should? Kognos (talk) 23:01, 19 November 2013 (UTC)