Answer to Question #34453 in Atomic and Nuclear Physics for junaid iqbal
1. Escape of neutrons from uranium,
2. Capture by uranium without division,
3. Capture by impurities.
4. Capture by uranium division.
If the lossof neutrons in the first three processes than the number of neutrons produced by the fourth, the chain reaction occurs, otherwise it is impossible. Obviously, any of the first three processes may have a greater chance in this location that the extra neutrons in the fission, unable to keep the reaction going. For example, in the case where the process 2 - capture by uranium without division - has a much higher probability than fission capture chain reaction impossible.
An additional difficulty is that the natural uranium is composed of three isotopes: U- 234, U- 235 and U- 238 contained in amounts of approximately 0.006, 0.7 and 99.3 %, respectively. We have already seen that the probability of the 2 and 4 are different for different isotopes. We have also seen that the probabilities are different for neutrons of different energies.
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