Physics Dubna reproduced synthesis of superheavy element 117

MOSCOW, June 25. Physicists at the Joint Institute for Nuclear Research (JINR) in Dubna near Moscow successfully replicated the experiment on the synthesis of superheavy element 117 of the periodic table, obtaining evidence that will help the official recognition of the opening of the new element by the International Union of Pure and Applied Chemistry, told RIA Novosti deputy director of the Laboratory of Nuclear Reactions Andrew Popeko.

In nature there are no elements with an atomic number (number of protons in the nucleus of an atom) is greater than 92, that is heavier than uranium. Heavier elements, such as plutonium, can be produced within nuclear reactors, and the elements heavier than 100th (farms) can only be obtained with accelerators by bombarding targets with heavy ions. At the confluence of the target nuclei and the "shell" and there are the core of a new element.

First nucleus of element 117 Dubna physicists were obtained in 2010. For the synthesis of superheavy element of the target element 97, berkelium-249 produced at the Oak Ridge National Laboratory (USA), firing calcium ions-48 at the U-400. Then it was reliably recorded six events of the nuclei of element 117.

However, for the official recognition of the opening of the new elements of the International Union of Pure and Applied Chemistry (IUPAC) requires re-obtain the same result — a different or the same laboratory.

"Eighteen months ago we started this experiment. At the same reaction berkelium-249 and calcium-48, we received five events of the 117th element with an atomic mass of 293. This is a very good fit to the results of the last experiment," — said Popeko.

According to him, at present, the U-400 is temporarily stopped and then resumed the experiment.

"We hope to get a heavier isotope of element 117 — with an atomic mass of 294. Autumn, we once again take a break to clean the target of the decay products of Berkeley, and then begin to research aimed at studying the chemical properties of element 113, which is formed by the decay of 117 th "- said the scientist.

He said that the IUPAC has officially announced the acceptance of applications for 113, 115, 117 and 118 elements — all of which were first synthesized in Dubna. Following the consideration of applications will determine the priority of the Union — who will be the pioneer and will be entitled to offer names for these elements.

"We have already submitted an application, the review process may take about a year," — said Popeko.

German competitors Dubna — Center for Heavy Ion Research in Darmstadt GSI — currently storming the following "peak" in April 2011, they spent the remainder of unsuccessful Experiment synthesis of element 120 in the reaction of chromium-54-248 and curium. Now GSI is an experiment on the synthesis of element 119 in the reaction 249 Berkeley — titanium-50.

"German colleagues reported that while it is not received. First series of the experiment will end on July 6-7. Then would be a big break, GSI future plans are unclear," — said Popeko.

JINR physicists in the meantime plan to repeat the synthesis Element 118.

"We want to try the heavier isotopes of element 118. This will be the reaction is no longer the 49th California and calcium, and the 51st californium. This is a very complex experiment, the preparation will need about a year," — said the source.

In addition, the JINR scientists will soon have a new accelerator DC-280 — under him already poured the foundation.

"This will be the third largest accelerator LNR (in addition to the existing U-400 and U-400M) — a specialized factory of superheavy elements" — he added.

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