Researchers from Lund University in Sweden presented new evidence in August 2013 for the synthesis of element 115 in an experiment at the Gesellschaft für Schwerionenforschung (GSI) laboratory in Darmstadt, Germany. In the experiment, calcium-48 ions were accelerated into americium-243 atoms to produce element 115 as the fusion reaction product. These results bring the substance one step closer to official acceptance as a new element. See also: Americium; Atomic number; Calcium; Mass number; Nuclear reaction
In 2012, researchers from the Flerov Laboratory of Nuclear Reactions (FLNR), Dubna, Russia and Vanderbilt University, Lawrence Livermore National Laboratory, and Oak Ridge National Laboratory in the United States reported that they had produce 21 isotopes of element 115 from reactions of americium-243 (243Am) with calcium-48 (48Ca). See also: Definitive evidence for new elements 113 and 115; Isotope
The earliest detection of element 115 was in 2003 at FLNR. In that experiment, four isotopes of element 115 were detected. These findings were considered inclusive by the International Union of Pure and Applied Chemistry (IUPAC) and the International Union of Pure and Applied Physics (IUPAP), which are jointly responsible for approving new chemical elements.
If approved, element 115 will become the twenty-third named transuranium element. Until then, element 115 will continue to be known by its unofficial name ununpentium (Uup). See also: Periodic table