A nuclear fission chain reaction of uranium-235 is bombarded with neutrons and produces barium142, krypton-91, and three neutrons.
In nuclear physics, a nuclear chain reaction takes place when one single nuclear reaction causes an average of subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions. The specific nuclear reaction can be defined as the fission of heavy isotopes (e.g., uranium-235, ²³⁵U).
Fission chain reactions take place due to interactions between neutrons and fissile isotopes (such as ²³⁵U). The chain reaction needs both the emit of neutrons from fissile isotopes undergoing nuclear fission and the absorption of some of these neutrons in fissile isotopes.
[tex]^{235}U +\;^1n_0 \longrightarrow \; ^{141}Ba_{56} +^{92}Kr_{36} +3^1n_0 +\;Energy[/tex]
Therefore, three neutrons produce along with Barium 142, Krypton-91.
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