Talk:Spontaneous fission

message: The illustration taken from French Wikipedia shows that what must be U-238 has a spontaneous fission half-life of 10 to the 24th years, and U-235 around ten to the 27th years. But the table gives values of 8.4 times 10 to the 15th years for U-238, and 3.5 times 10 to the 17 years for U-235. What's going on?
I then thought perhaps the illustration was using seconds as the units of time, but the answers I get when I convert the table values to seconds are still around two orders of magnitude lower than the illustration.
Will someone with more knowledge please straighten this out? Saintonge235 (talk) 18:49, 6 January 2022 (UTC)
thread_title: Problem with the Data

message: I have put a citation needed tag in this section because the number for U-235 disagrees with what I have read elsewhere (althought I don't have all that much faith in other sources).  It would be nice to have a reliable source. Man with two legs 09:54, 16 October 2006 (UTC)
thread_title: Rates of spontaneous fission

message: Spontaneous fission is a random failure rate characteristic of atomic nuclides. Evidently nature more or less indiscriminately produced a lot of them and then, over time, the more stable ones stayed in existence longer than the rest. A measure of the relative stability of each isotope is its halflifetime period, when half of the remaining ones will have decayed. Rather than a mishmash of time period values, the value of the halflifetime period is better understood as the base 10 logsecond halflifetime value, which can only vary from negative values (for less than 1 second) to say a value of 18 or more (the life of the universe). The occurrence of spontaneous fission is noted to occur to nuclides that are close to structural conditions that are stable, such that they don't have individual nucleon condition problems or alpha emission tendency problems, but are nevertheless not structurally enough stable to be able to survive a random variation of conditions that can result in their splitting into fragments.WFPM (talk) 19:06, 8 April 2011 (UTC)
thread_title: Spontaneous fission occurrences

message: What's that then?  — Preceding unsigned comment added by 95.146.50.110 (talk) 10:51, 25 July 2011 (UTC)
thread_title:  Neutrons per g.s. 

message: Why 92 mass unit? (92Zr), not 58Ni? or 116Sn???  — Preceding unsigned comment added by 59.126.202.81 (talk) 15:15, 15 July 2012 (UTC)
thread_title:  Is 92 mass unit? 

message: (Z^2)/A>45, but "Nb-93": (41^2)/93=18.0752688<45  — Preceding unsigned comment added by 59.126.202.81 (talk) 15:17, 15 July 2012 (UTC)
thread_title:  Nb-93 

message: According to Isotopes of helium, Helium-8 can undergo fission into Helium-5 and Tritium (and an electron), with a 0.9% probability. I'm not sure what the source for that claim is there. But if it's true, would that not be spontaneous fission, and if so, wouldn't that be noteworthy for the article here? Same holds for Lithium-11. --Thogo 17:40, 23 May 2015 (UTC)
replies: text: It's fission after the beta decay, which releases a lot of energy, possibly more than these weakly bound nuclei can bear. But it is not really spontaneous because the energy is coming in from some source. Double sharp (talk) 16:50, 8 April 2017 (UTC)
thread_title:  SF for small nuclides 

message: We can see that the N = 152 isotone 248Cm has only a small branch of SF (8.39%), the N = 154 isotone 252Cf (3.092%) also, whereas for N = 156, 254Cf (99.69%), 256Fm (91.9%) and 258No (100%) all have SF as the major decay mode. Is there any reason? 129.104.241.214 (talk) 09:00, 28 January 2024 (UTC)
thread_title:  SF becomes significant starting from ''N'' = 156