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Gun-type fission weapon

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Gun-Type and Implosion-Type Nuclear Fission Bombs

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GUN-TYPE FISSION WEAPON

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Gun-Type Fission Weapon: Summary

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"Little Boy" Uranium Bomb

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Fission Gun update

Gun-type fission weapons are fission-based nuclear weapons whose design assembles their fissile material into a supercritical mass by the use of the "gun" method: shooting one piece of sub-critical material into another. Although this is sometimes pictured as two sub-critical hemispheres driven together to make a supercritical sphere, typically a hollow projectile is shot onto a spike which fills the hole in its center. Its name is a reference to the fact that it is shooting the material through an artillery barrel as if it were a projectile. Other potential arrangements may include firing two pieces into each other simultaneously, though whether this approach has been used in actual weapons designs is unknown.
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  • Types 

  • Little Boy 

  • Proliferation and terrorism 

  • Comparison with the implosion method 

  • US nuclear artillery