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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, October 8, 2010
Room 155, Chem-Phys Building

Dr. Joseph H. Hamilton
Department of Physics and Astronomy
Vanderbilt University

Synthesis of New Superheavy Elements: The New Superheavy Element 117
A brief history of the discovery of new elements from the time of the Mendeleev Periodic Table will be presented. The discoveries of superheavy elements with Z = 108-118 via cold and hot fusion reactions will be described. Then details of the discovery of the new chemical element with atomic number Z = 117 will be presented. The isotopes 293117 and 294117 were produced in hot fusion reactions between 48Ca and 249Bk in Dubna, Russia. The 249Bk was produced in the high flux reactor in Oak Ridge. Decay chains involving eleven new nuclei were identified by means of the Dubna Gas Filled Recoil Separator. The measured decay properties show a strong rise of stability for superheavy nuclei around N = 184.

Refreshments will be served in CP 179 at 3:15 PM