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Discoveries made by groups from Russia, Japan, and the U.S. are confirmed
January 5, 2016 | Emily Conover
Image: wikimedia commons
A portion of the periodic table is highlighted here to show the four new chemical elements: 113, 115, 117, and 118.
Four new chemical elements will take their places in the periodic table, the International Union of Pure and Applied Chemistry (IUPAC) announced last week. IUPAC verified the discoveries of elements 113, 115, 117, and 118, which complete the periodic table's seventh row.
Element 113 was discovered by a collaboration at RIKEN in Japan, and elements 115 and 117 were discovered by a collaboration between the Joint Institute for Nuclear Research in Dubna, Russia, Lawrence Livermore National Laboratory, and Oak Ridge National Laboratory. Element 118 was discovered by a collaboration between the Joint Institute for Nuclear Research and Lawrence Livermore. The collaborations will be given naming rights for the new elements.
The following papers published in APS journals helped clinch the case for discovery of the various elements:
PRC: Experiments on the synthesis of element 115 in the reaction 243Am(48Ca,xn)291−x115
PRL: Spectroscopy of Element 115 Decay Chains
Physics Synopsis: Element 115 Confirmed
PRL: Synthesis of a New Element with Atomic Number Z=117
Physics Viewpoint: Exploring the island of superheavy elements
PRL: 48Ca+249Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying 270Db and Discovery of 266Lr
Physics Synopsis: Element Z=117 Confirmed
PRC: Synthesis of the isotopes of elements 118 and 116 in the 249Cf and 245Cm+48Ca fusion reactions