NUCLEAR WEAPONS

NUCLEAR WEAPONS - NUCLEAR WEAPONS First nuclear bomb...

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NUCLEAR WEAPONS First nuclear bomb exploded in New Mexico(US ), July 16 1945, at the trinity site. It was a plutonium bomb (not uranium). The expected yield was thought to be 1 kT. ( 1000 tonnes of TNT equivalent), but it was actually 20kT . First splitting of a nucleus took place in Germany . split U235 nuclei. They bombarded U235 with slow neutrons (need to be slow, otherwise go right through)(slowing down is done via moderators like graphite), creating U236, which is not stable, so splits into many different species, and emits more neutrons. Some mass has been lost and converted to energy. Fission = splitting of nucleus caused by neutron bombardment. Termed by Lise Meitner and her nephew Otto Frisch . Leo Szilard, Edward Teller, and Eugene Wigner were worried about this new form of E being used by Germans to make nuclear weapon. They asked Einstein to write a letter to Roosevelt to warn him. This let to Manhattan Project , directed by Enrico Fermi. 1) First part of process was to develop a sustained nuclear reaction. This was done in University of Chicago football station . U235 piled with graphite (good moderator) , producing a few watts. Depending
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NUCLEAR WEAPONS - NUCLEAR WEAPONS First nuclear bomb...

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