Synthesis of a New Element with Atomic Number<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>117</mml:mn></mml:math>
Yu. Ts. OganessianJoint Institute for Nuclear Research, RU-141980 Dubna, Russian Federation. [email protected]F. Sh. AbdullinJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationP. D. BaileyOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USADennis BenkerOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAMegan BennettUniversity of Nevada Las Vegas, Las Vegas, Nevada 89154, USAS. N. DmitrievJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationJulie EzoldOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAJ. H. HamiltonDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAR. HendersonLawrence Livemore National Laboratory, Livermore, California 94551, USAМ. Г. ИткисJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationYu. V. LobanovJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationAndrey MezentsevJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationK. J. MoodyLawrence Livemore National Laboratory, Livermore, California 94551, USAStephen NelsonLawrence Livemore National Laboratory, Livermore, California 94551, USAА. N. PolyakovJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationC. E. PorterOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAA. V. RamayyaDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAF. D. RileyOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAJ. B. RobertoOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAM. A. RyabininResearch Institute of Atomic Reactors, RU-433510 Dimitrovgrad, Russian FederationK. P. RykaczewskiOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAR. N. SagaidakJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationD. A. ShaughnessyLawrence Livemore National Laboratory, Livermore, California 94551, USAI. V. ShirokovskyJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationM. A. StoyerLawrence Livemore National Laboratory, Livermore, California 94551, USAV. G. SubbotinJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationRalf SudoweUniversity of Nevada Las Vegas, Las Vegas, Nevada 89154, USAA. M. SukhovJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationYu. S. TsyganovJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationV. K. UtyonkovJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationA. A. VoinovJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationG. K. VostokinJoint Institute for Nuclear Research, RU-141980 Dubna, Russian FederationP. A. WilkLawrence Livemore National Laboratory, Livermore, California 94551, USA
2010lv
ABI
Abstract
The discovery of a new chemical element with atomic number Z=117 is reported. The isotopes (293)117 and (294)117 were produced in fusion reactions between (48)Ca and (249)Bk. Decay chains involving 11 new nuclei were identified by means of the Dubna gas-filled recoil separator. The measured decay properties show a strong rise of stability for heavier isotopes with Z > or = 111, validating the concept of the long sought island of enhanced stability for superheavy nuclei.
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