Ununtrium: the essentials

Experiments resulting in the formation of element 115 were reported in February 2004 following experiments carried out between 14 July - 10 August 2003 involving scientists at Dubna (Joint Institute for Nuclear Research at the U400 cyclotron with the Dubna gas-filled recoil separator, DGFRS) in Russia in a collaboration also involving scientists at the Lawrence Livermore National Laboratory, USA. In these experiments, the primary product were four nuclei of element 115 isotopes. All these four nuclei decayed through the emisson of α-particles to isotopes of element 113. The claim has not yet been ratified, but the results are now published in a reputable peer-reviewed journal.

Table: basic information about and classifications of ununtrium.

Ununtrium: historical information

Ununtrium was discovered by (not yet confirmed) at 2003 (not yet confirmed) in (not yet confirmed). Origin of name: temporary systematic IUPAC nomenclature.

Experimental results reported in 2004 involving the bombardment of americium-243 with calcium-48 ions are consistent with the formation in the laboratory of a few atoms of elements 113 and 115. In experiments conducted at the JINR U400 cyclotron with the Dubna gas-filled separator between July 14 and Aug. 10, 2003, atomic decay patterns were observed said to confirm the existence of element 115 and element 113. In these decay chains, element 113 is produced via the α-decay of element 115.

The results are published in the 1 February 2004 issue of Physical Review C: "Experiments on the synthesis of element 115 in the reaction 243Am(48Ca,xn)291–x115", Yu. Ts. Oganessian, V. K. Utyonkoy, Yu. V. Lobanov, F. Sh. Abdullin, A. N. Polyakov, I. V. Shirokovsky, Yu. S. Tsyganov, G. G. Gulbekian, S. L. Bogomolov, A. N. Mezentsev, S. Iliev, V. G. Subbotin, A. M. Sukhov, A. A. Voinov, G. V. Buklanov, K. Subotic, V. I. Zagrebaev, M. G. Itkis, J. B. Patin, K. J. Moody, J. F. Wild, M. A. Stoyer, N. J. Stoyer, D. A. Shaughnessy, J. M. Kenneally, and R. W. Lougheed, Phys. Rev. C, 2004, 69, 021601(R).

Ununtrium: physical properties

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Ununtrium: orbital properties

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Isolation: currently, the identification of element 113 is yet to be confirmed by IUPAC, but the experiments leading to element 113 are now published in a prestigious peer reviewed journal. As only about four atoms of element 113 has ever been made (through decomposition of element 115 nuclei made in nuclear reactions involving fusing calcium nuclei with americium nuclei) isolation of an observable quantity has never been achieved, and may well never be. In the experiments leading to element 115 the following reactions occurred

24395Am + 4820Ca → 287115Uup + 4 1n

24395Am + 4820Ca → 288115Uup + 3 1n

In these first experiments, three nuclei of the 288Uup isotope were made and one of the 287Uup isotope. All the nuclei formed decayed in less than a second by emitting α-particles. These decays resulted in isotopes of ununtrium, element 113, (mass number 283 or 284, containing 113 protons and either 170 or 171 neutrons). These isotopes of element 113 are also radioactive and underwent further α-decay processes to isotopes of element 111 and so on down to at least element 105 (dubnium). One of the nuclei took over a second to decay to element 111.

287115Uup → 283113Uut + 42He (46.6 milliseconds) → 279111Uuu + 42He (147 milliseconds)

288115Uup → 284113Uut + 42He (80.3 milliseconds) → 280111Uuu + 42He (376 milliseconds)

288115Uup → 284113Uut + 42He (18.6 milliseconds) → 279111Uuu + 42He (1196 milliseconds)

288115Uup → 284113Uut + 42He (280 milliseconds) → 279111Uuu + 42He (517 milliseconds)

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ununtrium atomic number