For the fission reaction $_{92}U^{235} + _0n^1 \to _{56}Ba^{140} + _yE^x + 2_0n^1$,the values of $x$ and $y$ are:

$_6C^{14}$ is formed from $_7N^{14}$ in the upper atmosphere by the action of the fundamental particle:

The first controlled artificial disintegration of an atomic nucleus was achieved by

In the transformation of ${}_{92}^{238}U$ to ${}_{92}^{234}U$,if one emission is an $\alpha$-particle,what should be the other emission$(s)$?

In the nuclear reaction $_7N^{14} + _2He^4 \to _ZX^A + _1H^1$,the product nucleus $_ZX^A$ formed is:

Artificial elements have been prepared by bombardment reactions in high energy accelerators. What is the mass number of the element $X$ produced in the following nuclear reaction: $_{95}^{249}Cf + _{7}^{15}N \rightarrow _{105}X + 4_{0}^{1}n$?