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transmutation - same as the alchemists called it.
"Transmutation" is the general term; this could also be called "nuclear reaction."
The combination of the center of atoms to produce a heavier element is called nuclear fusion.
transmutation, neutrons
The atom that results from nuclear decay is called the daughter atom. The element of the daughter atom would be called the daughter element. The atom that decayed is called the parent.
One type of atom (element or isotope) is converted to another. This is called nuclear reaction.
There's nothing called achernobyl, but Chernobyl is a city in Ukraine, where probably the biggest nuclear accident in the world occured in 1986.
This process is known as nuclear fusion.
The world's worst known nuclear disaster was at Chernobyl, in the Ukraine. The Chernobyl Disaster, as it is called, happened on April 26, 1986. There is a link to a Wikipedia article on this below.
The country is simply called "Ukraine" without the definite article.
Nuclear fusion
Ukraine