science
Why is uranium-235 fissionable but uranium-238 not directly?
š” The Answer
- U-235 can undergo fission when absorbing a slow (thermal) neutron.
- U-238 requires fast neutrons with energy above 1 MeV to fission.
- The difference arises from the odd number of neutrons in U-235.
- U-238 often captures neutrons to become plutonium-239, which is fissionable.
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