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11-Fission (Enrichment techniques (EM separation (uses mass spectrometre,…
11-Fission
Enrichment techniques
EM separation
uses mass spectrometre, Calutron
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Power Reactors
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boiling water reactors
lower pressure, water boils inside pressure vessel to run turbine. No loops
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Types
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Induced
projectile particle required, usually neutron
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Chain reactions
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can then fission itself, can lead to chain reaction
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Uranium
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U-235 will fission at all energies, is fissile
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Critical mass
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depends on nuclear properties, fission crosssection,density,shape,enrichement, purity,temperature and surroundings.
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Liquid drop does a good job, but not complete picture. Works well for U-235
asymmetric fission quite probably, strong tendence to produce double magic number fragment A~140 with N=82 and Z=50