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  • Theory Of Nuclear Fission
    887 words
    1930 Schr " odin ger views electrons as continuous clouds and introduces 'wave mechanics' as a mathematical model of the atom. 1931 Albert Einstein urges all scientists to refuse military work. Harold C. Urey of the United States and associates discover deuterium (heavy hydrogen) which is present (0.014%) in all natural hydrogen compounds including water. John D. Cockcroft of Great Britain develops high-voltage apparatus for atomic transmutation. 1932 James Chadwick proves the existence of neutr...
  • Fission Fusion Weapons
    2,258 words
    Nuclear weapons are the most powerful and destructive technology ever created. From the first notion that nuclear technology could be harnessed to create a bomb, massive amounts of time and energy (as well as government funding) have been invested in further increasing the destructive yield of nuclear weapons. The process of development was carried out independently by governments worldwide. Despite the segregation of groups of scientists and secrecy surrounding their discoveries, design strateg...
  • Neutrons Back Into The Fissionable Material
    1,119 words
    also called ATOM BOMB, weapon with great explosive power that results from the sudden release of energy upon the splitting, or fission, of the nuclei of such heavy elements as plutonium or uranium. When a neutron strikes the nucleus of an atom of the isotopes uranium 235 or plutonium-239, it causes that nucleus to split into two fragments, each of which is a nucleus with about half the protons and neutrons of the original nucleus. In the process of splitting, a great amount of thermal energy, as...
  • Neutron Causes Fission
    1,133 words
    THE FIRST DESIGN of a nuclear weapon in the United States was a gun-barrel assembly, in which two sub-critical masses of very highly enriched uranium (HEU), were brought together by normal artillery propellant in a short gun barrel into a single over-critical configuration. (Criticality defines the minimum amount of a fissionable material in a particular configuration and density capable of a self-sustaining chain reaction). The second type of fission weapon is the implosion assembly, in which a...
  • Reactor The Fission Neutrons
    864 words
    nuclear fission Fission chain reactions and their control The emission of several neutrons in the fission process leads to the possibility of a chain reaction if at least one of the fission neutrons induces fission in another fissile nucleus, which in turn fissions and emits neutrons to continue the chain. If more than one neutron is effective in inducing fission in other nuclei, the chain multiplies more rapidly. The condition for a chain reaction is usually expressed in terms of a multiplicati...

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