Ununhexium

In December, 2000 the Joint Institute for Nuclear Research (Dubna, Russia) published results^[1] that described the discovery in 2000 of decay of the isotope ²⁹²Uuh, which was produced in the reaction of ²⁴⁸Island of stability).

In 2004 in the Joint Institute for Nuclear Research the synthesis of this element was confirmed by another method (the chemical identifying on final products of decay of element).

Further research

Ununhexium is a temporary IUPAC systematic element name.

In October, 2006 it was announced that on three occasions californium-249 atoms had been bombarded with ununoctium (element 118), which decayed to ununhexium within a millisecond.^[2] If confirmed, the synthesis of element 116 will have been proven definitively.

The reaction that created ununhexium is:

$\,^{248}_{96}\mathrm{Cm} + \,^{48}_{20}\mathrm{Ca} \, \to \,^{292}_{116}\mathrm{Uuh} + 4 \; ^1_0\mathrm{n} \;$

This decayed 47 milliseconds later as follows to a previously identified isotope of element 114, Uuq.

$\,^{292}_{116}\mathrm{Uuh} \to \,^{288}_{114}\mathrm{Uuq} \, + \,^{4}_{2}\mathrm{He} \;$

History

In 1999, researchers at Lawrence Berkeley National Laboratory announced the discovery of elements 116 and ununoctium), in a paper published in Physical Review Letters.^[3] The following year, they published a retraction after other researchers were unable to duplicate the results.^[4] In June 2002, the director of the lab announced that the original claim of the discovery of these two elements had been based on data fabricated by the principal author Victor Ninov.

References

^ Oganessian, Yu. Ts.; et al. (2000). "Observation of the decay of ²⁹²116". Physical Review C 63: 011301. doi:10.1103/PhysRevC.63.011301.
^ Oganessian, Yu. Ts.; et al. (2006). "Synthesis of the isotopes of elements 118 and 116 in the ²⁴⁹Cf and ²⁴⁵Cm+⁴⁸Ca fusion reactions". Physical Review C 74: 044602. doi:10.1103/PhysRevC.74.044602.
^ Ninov, V.; et al. (1999). "Observation of Superheavy Nuclei Produced in the Reaction of ⁸⁶Kr with ²⁰⁸Pb". Physical Review Letters 83: 1104. doi:10.1103/PhysRevLett.83.1104.
^ Editorial note on the preceding.

Ununhexium

Contents

Discovery

Further research

History

References

See also