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As 1 MeV is a typical fission neutron energy, this means that after a few scatters neutrons become significantly less effective at causing 238U fission

Any constant value will notably neglect the energy dependence of the 238U fission cross section, which drops off sharply below about 1 MeV · 2025

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Improvised Nuclear Weapons with 60%-Enriched Uranium

physics.soc-ph · 2025-07-27 · conditional · novelty 5.0

Using a simplified FissionBomb model with adjusted cross sections, the paper finds that a 40 kg core of 60%-enriched uranium in a roughly 20 tonne tamper could yield about 1 to 1.4 kilotons.

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  • Improvised Nuclear Weapons with 60%-Enriched Uranium physics.soc-ph · 2025-07-27 · conditional · none · ref 5

    Using a simplified FissionBomb model with adjusted cross sections, the paper finds that a 40 kg core of 60%-enriched uranium in a roughly 20 tonne tamper could yield about 1 to 1.4 kilotons.