Flerov Laboratory of Nuclear Reactions

Flerov Laboratory of Nuclear Reactions. It is a major research division of the Joint Institute for Nuclear Research (JINR) located in Dubna, Russia. Founded in 1957 and named after the eminent physicist Georgy Flerov, the laboratory has been a world-leading center for the synthesis and study of transuranium elements and superheavy elements. Its pioneering work has been instrumental in expanding the periodic table, discovering numerous new chemical elements through advanced nuclear reaction techniques.

History

The laboratory was established in 1957 following the creation of the Joint Institute for Nuclear Research, an international scientific hub formed by socialist states as a counterpart to CERN. Its founding director, Georgy Flerov, was a key figure in Soviet atomic bomb project and had earlier co-discovered spontaneous fission. Under his leadership, the laboratory quickly focused on the synthesis of new elements, building upon the legacy of earlier Soviet research at institutions like the Kurchatov Institute. A landmark early achievement was the 1964 synthesis of element 104, which sparked a prolonged period of scientific rivalry known as the Transfermium Wars with American researchers at the Lawrence Berkeley National Laboratory. Throughout the Cold War, the laboratory expanded its capabilities, cementing its reputation as a premier facility for heavy ion physics and nuclear chemistry.

Research and discoveries

The core scientific mission is the discovery and investigation of superheavy elements at the limits of the periodic table. Researchers employ hot fusion and cold fusion reactions, typically using accelerated beams of heavy ions like calcium-48 to bombard targets made of actinides such as berkelium or californium. This work has led to the official discovery of several elements, including dubnium (105), flerovium (114), moscovium (115), livermorium (116), and tennessine (117), as recognized by the International Union of Pure and Applied Chemistry (IUPAC) and the International Union of Pure and Applied Physics (IUPAC-IUPAP Joint Working Group). Beyond synthesis, studies focus on the nuclear properties, chemical properties and decay chains of these elements, testing predictions of the island of stability. The laboratory also conducts research in nuclear physics, radiation material science, and the production of radioisotopes for medical and industrial applications.

Facilities and equipment

The laboratory operates a suite of powerful particle accelerators and specialized experimental setups. The centerpiece is the U-400 cyclotron and its modernized version, the U-400M, which provides intense beams of ions from carbon to argon. The even heavier ion accelerator, the U-400R cyclotron, is crucial for synthesis experiments. These machines feed beams to dedicated experimental areas such as the Gas-Filled Recoil Separator (DGFRS), a key apparatus for isolating and identifying superheavy nuclei. Other significant infrastructure includes the MASHA mass separator and various setups for gamma-ray spectroscopy and alpha spectroscopy. The laboratory also houses extensive facilities for the chemical processing and study of radioactive materials, including glovebox lines and radiochemical laboratories.

Scientific collaborations

As part of the international Joint Institute for Nuclear Research, the laboratory maintains extensive global partnerships. Major collaborative efforts in superheavy element research have been conducted with leading national laboratories in the United States, including Oak Ridge National Laboratory, which provides rare actinide targets like berkelium-249, and Lawrence Livermore National Laboratory. Within Europe, it collaborates with institutions such as GSI Helmholtz Centre for Heavy Ion Research in Germany and research groups in Sweden and Finland. Significant partnerships also exist with institutes in Japan, such as RIKEN, and within the Commonwealth of Independent States. These collaborations often involve shared experiments, data analysis, and joint publications in journals like Physical Review C.

Notable personnel

The laboratory has been home to many distinguished scientists. Its founder and long-time director, Georgy Flerov, was a full member of the Academy of Sciences of the USSR and a Hero of Socialist Labor. His successor, Yuri Oganessian, a world-renowned physicist and namesake of oganesson (element 118), has led the laboratory for decades and is also an academician of the Russian Academy of Sciences. Other key figures include Vladimir Utyonkov, a leading experimentalist in superheavy element synthesis, and the theoretical physicist Mikhail Itkis. The laboratory has also nurtured the careers of numerous researchers who have made significant contributions to nuclear reaction theory and experimental techniques.

Category:Laboratories in Russia Category:Nuclear physics laboratories Category:Joint Institute for Nuclear Research