Determine the Missing Product X in the Nuclear Reaction ${ } _ { 92 } ^ { 238 } U + { } _ { 0 } ^ { 1 } n \rightarrow X + 2 \beta ^ { - }$

Determine the missing product X in the nuclear reaction ${ } _ { 92 } ^ { 238 } U + { } _ { 0 } ^ { 1 } n \rightarrow X + 2 \beta ^ { - }$