Oak Ridge Today

ORNL associate lab director to discuss discovery of elements 115, 117; super-heavy nuclei; ‘island of stability’

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Jim Roberto

Jim Roberto

Jim Roberto, an associate laboratory director at Oak Ridge National Laboratory, will discuss the discovery of elements 115 and 117, super-heavy nuclei, and the “island of stability” during a Wednesday evening talk next week.

Roberto, ORNL associate laboratory director for science and technology partnerships, will give the featured talk to the ORION astronomy club at 7 p.m. Wednesday, March 16. The talk will be at the Grove Theater at 123 Randolph Road in Oak Ridge.

Roberto’s talk is titled “The Discovery of Elements 115 and 117: SuperHeavy Nuclei and the ‘Island of Stability.'” Roberto will review recent progress in super-heavy element research with particular focus on the significance of element 117 and its decay products as evidence for the existence of the presumed “island of stability” for super-heavy nuclei, a press release said. [Read more…]

Synthetic material from ORNL used in discovery of new elements 115, 117

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ORNL Berkelium-249

Berkelium-249, contained in the greenish fluid in the tip of the vial, was crucial to the experiment that discovered element 117. It was made in the research reactor at the U.S. Department of Energy’s Oak Ridge National Laboratory. (Photo by ORNL)

 

Twenty-two milligrams of a very pure synthetic material produced at Oak Ridge National Laboratory were used in the discovery of two new chemical elements that will help fill out the seventh row of the periodic table.

The synthetic element, berkelium-249, was produced in a project that started with a six-month irradiation of a target material at the High Flux Isotope Reactor at ORNL. The resulting product was separated and processed during a three-month period at the lab’s Radiochemical Engineering Development Center.

The berkelium-249 was then shipped to the Joint Institute for Nuclear Research, or JINR, in Dubna, Russia, where it was intensely bombarded, or irradiated, with calcium-48 ions, creating six atoms of element 117, said Jim Roberto, ORNL associate lab director for science and technology partnerships. Berkelium-249, which does not exist in nature, has a 300-day lifetime, so researchers had a short time to do their experiments.

Element 117 is one of four new elements that have been officially verified by the International Union for Pure and Applied Chemistry. The IUPAC announced the discoveries on December 30. The other three are elements 113, 115, and 118. Element 115 is produced when element 117 decays. [Read more…]

ORNL plays role as four new elements added to periodic table, filling seventh row

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Periodic Table of Elements

Periodic Table of Elements (Image by Los Alamos National Laboratory)

 

Note: This story was updated at 10:56 p.m. Jan. 6.

Four new elements have been added to the periodic table, filling the seventh row, or period, and Oak Ridge National Laboratory played a role in discovering two of them.

The discovery and assignment of elements with atomic numbers 113, 115, 117, and 118 was announced on December 30 by the International Association of Pure and Applied Chemistry. The discoveries have been officially verified.

ORNL participated in the discovery of elements 115 and 117 in a collaboration between the Joint Institute for Nuclear Research in Dubna, Russia, and Lawrence Livermore National Laboratory in California.

The discoverers, who also include researchers in Japan, will now be invited to suggest permanent names and symbols.

For now, the elements are known as: [Read more…]