Answer :
It wouldn't be as important in this circumstance.
What is Critical mass?
In nuclear engineering, a critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction. The critical mass of a fissionable material depends upon its
- nuclear properties,
- density, shape,
- enrichment,
- purity,
- temperature,
- surroundings.
The pancake-shaped U-235 sphere will initially be unable to absorb as many neutrons because of its flattened form.
Neutrons escape will become important. It wouldn't be as important in this circumstance.
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