The nuclear reactions are;
1) 263/106 Sg ----> 259/104Rf + 4/2He
2) 211/83 At ----> 207/81 Tl + 4/2He
3) 252/98 Cf ----> 248/96Cm + 4/2He
4) 239/94 Pu --> 235/92 U + 4/2He
What is a nuclear reaction?
A nuclear reaction is the creation of a new nucleus as a result of modifications to the atomic nucleus' composition or structure. These reactions release a large amount of energy and alter the number of protons and neutrons in the nucleus.
Nuclear reactions differ from chemical reactions in that they involve changes in the nucleus rather than in the electron cloud around the nucleus.