The nuclides starting from with the isotope niobium-93 and extending to all higher atomic mass numbers, could theoretically experience spontaneous fission.
42.
238 U occasionally decays by spontaneous fission or double beta decay with probabilities of 5 and 2 per alpha decay, respectively.
43.
In this situation, for short time intervals the probability of a spontaneous fission is directly proportional to the length of time.
44.
They were able to detect a spontaneous fission activity assigned to 255 Rf, a product of the 263 Hs decay chain.
45.
Within the Earth's crust a second source is neutrons produced primarily by spontaneous fission of uranium and thorium present in crustal minerals.
46.
The reaction was repeated in 1994 and the team were able to measure both alpha decay and spontaneous fission for 264 Hs.
47.
On Earth, technetium occurs naturally only in uranium ores as a product of spontaneous fission; the quantities are infinitesimal but have been measured.
48.
Many other rare types of decay, such as spontaneous fission or cluster decay are known . ( See radioactive decay for details .)
49.
All fissionable and fissile isotopes undergo a small amount of spontaneous fission which releases a few free neutrons into any sample of nuclear fuel.
50.
Further radionunclides may occur in nature in virtually undetectable amounts as a result of rare events such as spontaneous fission or uncommon cosmic ray interactions.
