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The team studied the nuclear fusion reaction between uranium ions and a target of natural nickel: [91] [92] 238 92 U + nat 28 Ni → 296,298,299,300,302 120 Ubn * → fission. The results indicated that nuclei of unbinilium were produced at high (~70 MeV) excitation energy which underwent fission with measurable half-lives just over 10 −18 s.
Jens Volker Kratz predicted the actual maximum cross section for producing unbinilium by any of the four reactions 238 U+ 64 Ni, 244 Pu+ 58 Fe, 248 Cm+ 54 Cr, or 249 Cf+ 50 Ti to be around 0.1 fb; [21] in comparison, the world record for the smallest cross section of a successful reaction was 30 fb for the reaction 209 Bi(70 Zn,n) 278 Nh, [11 ...
Even so, it will likely be a great challenge to synthesize elements beyond unbinilium (120) or unbiunium (121), given their short predicted half-lives and low predicted cross sections. [69] It has been suggested that fusion-evaporation will not be feasible to reach unbihexium.
Unbiunium, also known as eka-actinium or element 121, is a hypothetical chemical element; it has symbol Ubu and atomic number 121. Unbiunium and Ubu are the temporary systematic IUPAC name and symbol respectively, which are used until the element is discovered, confirmed, and a permanent name is decided upon.
This is an accepted version of this page This is the latest accepted revision, reviewed on 12 November 2024. Periodic table of the elements with eight or more periods Extended periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium ...
That fusion process essentially shut down at about 20 minutes, due to drops in temperature and density as the universe continued to expand. This first process, Big Bang nucleosynthesis , was the first type of nucleogenesis to occur in the universe, creating the so-called primordial elements .
Sometimes, eka- is still used to refer to some of the transuranic elements, for example, eka-radium for unbinilium. But current official IUPAC practice is to use a systematic element name based on the atomic number of the element as the provisional name, instead of being based on its position in the periodic table as these prefixes require.
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