Ununseptium: the essentials

An article published in Physical Review Letters on 5 April 2010 (submitted 15 March 2010, "Synthesis of a new chemical element with atomic number Z=117", Joint Institute for Nuclear Research, RU-141980 Dubna, Russian Federation, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA, Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA, Lawrence Livemore National Laboratory, Livermore, California 94551, USA, and Research Institute of Atomic Reactors, RU-433510 Dimitrovgrad, Russian Federation) claims the identification of six atoms of the isotopes 293Uus (five atoms) and 294Uus (one atom) in fusion reactions between 48Ca and 249Bk.

4820Ca + 24997Bk → 297117Uus* → 293117Uus + 4 n

4820Ca + 24997Bk → 297117Uus* → 294117Uus + 3 n

Decay chains involving eleven nuclei were identified by means of the Dubna Gas Filled Recoil Separator. It is said that the measured decay properties show a rise of stability for heavier isotopes with Z>=111, validating the concept of the "long sought island of enhanced stability for super-heavy nuclei".

The half life for 293Uus is 0.014(+0.011-0.004) seconds and that for 294Uus is 0.078(+0.370-0.036) seconds. Each undergoes sequential decay chains down to 281Rg and 270Db respectively.

Table: basic information about and classifications of ununseptium.

Ununseptium: historical information

Ununseptium was discovered by (not yet confirmed) at 2010 (not yet confirmed) in (not yet confirmed). Origin of name: temporary systematic IUPAC nomenclature.

Claims for the formation of element 117 (ununseptium, Uus) were first published in April 2010 but have not been confirmed yet.

Ununseptium: physical properties

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Ununseptium: orbital properties

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Isolation

Isolation: an article published in Physical Review Letters on 5 April 2010 ("Synthesis of a new chemical element with atomic number Z=117") claims the identification of six atoms of the isotopes 293Uus (five atoms) and 294Uus (one atom) in fusion reactions between 48Ca and 249Bk.

4820Ca + 24997Bk → 297117Uus* → 293117Uus + 4 n

4820Ca + 24997Bk → 297117Uus* → 294117Uus + 3 n

Decay chains involving eleven nuclei were identified by means of the Dubna Gas Filled Recoil Separator. It is said that the measured decay properties show a rise of stability for heavier isotopes with Z>=111, validating the concept of the "long sought island of enhanced stability for super-heavy nuclei".

The half life for 293Uus is 0.014(+0.011-0.004) seconds and that for 294Uus is 0.078(+0.370-0.036) seconds. Each undergoes sequential decay chains down to 281Rg and 270Db respectively.

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ununseptium atomic number