Initiating nuclear fission requires the critical energy to be _______________ the atom's neutron binding energy?
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Answer: C. More than
Explanation
Nuclear fission is initiated when the incoming energy equals or exceeds the neutron binding energy of the target nucleus. An incoming neutron must deposit sufficient excitation energy to overcome the fission barrier holding the heavy nucleus together. If the available activation energy falls below this critical threshold, the nucleus merely captures the neutron without undergoing fission. Heavy atomic nuclei like uranium and plutonium are held together by strong nuclear forces balanced against electrostatic repulsion. Neutron binding energy represents the energy released when a neutron joins a nucleus or the energy required to remove it. Fission barrier heights determine whether a specific nuclide is fissile with thermal neutrons or fissionable only by fast neutrons.
Equal energy matching is sometimes sufficient, but many fertile nuclei require incident neutrons to possess more than the threshold binding energy. Less than the binding energy fails to provide the deformation energy needed to split the heavy atomic nucleus apart. Option C is correct because threshold fission mechanics strictly require excess energy surpassing the nuclear binding limit.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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