HistoryIn 1964 a team of the Institut unified of nuclear research of Doubna indicated to have carried out for the first time the synthesis of element 104. The Soviet researchers had used for the synthesis a target of Plutonium bombarded by a beam of ions of Néon of an energy of 113-115 MeV. They announced that they had detected a nuclear fission by observing under the microscope special glass, which indicated for them the presence of a new element.
In 1969 of the researchers of the Université of Berkeley, synthesized this element by subjecting Californium -249 and Carbone -12 to intense collisions. The group of the University of California also announced that it could not reproduce the results of the Soviet scientists.
It resulted from these experiments a controversy on the name to be given to this element. The Soviets protested that they had detected it in first with Doubna and asked so that it is named dubnium (dB) or kourtchatovium (Ku) in the honor of Igor Vassilievitch Kourtchatov, former director of the Soviet nuclear research. The Americans on their side proposed for the new element the name of rutherfordium (Rf), in the honor of Ernest Rutherford.
UICPA adopted temporarily the name of Unnilquadium (Unq symbol), and it is only in 1997 that a compromise was finally carried out: the name rutherfordium was adopted and it is the element 105 which was named Dubnium.
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