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Just to start, the shotgun type bombs dropped on heroshima and nagagaski fired the slug at about 300 m/s.

And I was thinking about this.

Hypothetically you could heat the necessary metals till molten, and then cavitate them using high frequency sonication.
Vacuum bubbles or cavities in liquid collapse at 370+ m/s (if my figures are correct).
More than enough for the shotgun effect.

Why wouldn't this be possible as a nuclear fission mechanism?