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  • The spontaneous nuclear fission rate is the probability per second that a given atom will fission spontaneously--that is, without any external intervention. If a spontaneous fission occurs before the bomb is fully ready, it could fizzle. Plutonium 239 has a very high spontaneous fission rate compared to the spontaneous fission rate of uranium 235.
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  • Upon further study it was found, quite remarkably, that the uranium deposits at Oklo, in some sixteen different locations, had undergone spontaneous fission inside a naturally occurring reactor approximately 1.7 billion years ago.
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  • Uranium is a common element on Earth and has existed since the planet formed. While there are several varieties of uranium, uranium-235 (U-235) is the one most important to the production of both nuclear power and nuclear bombs. U-235 decays naturally by alpha radiation: It throws off an alpha particle, or two neutrons and two protons bound together.
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  • Spontaneous fission is a form of radioactive decay where an atom's nucleus splits into two smaller nuclei and generally one or more neutrons. Spontaneous fission generally in atoms with atomic numbers above 90. Spontaneous fission is a relatively slow process except for the heaviest isotopes.For example, uranium-238 decays by alpha decay with a half-life on the order of 10 9 years, but also ...
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  • The rate of spontaneous nuclear fission is the probability per second that a given atom will spontaneously fission – that is, without any external intervention. Plutonium-239 has a very high spontaneous fission rate compared to the spontaneous fission rate of uranium-235.
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  • The spontaneous fission of naturally occurring isotopes of uranium (uranium-238 and uranium-235) does leave trails of damage in the crystal structure of uranium-containing minerals when the fission fragments recoil through them. A radiometric dating technique based on analyses of these damage trails, or tracks, left by fission fragments in certain uranium-bearing minerals and glasses is known ...
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  • Nuclear fission, subdivision of a heavy atomic nucleus, such as that of uranium or plutonium, into two fragments of roughly equal mass. The process is accompanied by the release of a large amount of energy. Nuclear fission may take place spontaneously or may be induced by the excitation of the nucleus.
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  • Spontaneous fission, type of radioactive decay in which certain unstable nuclei of heavier elements split into two nearly equal fragments (nuclei of lighter elements) and liberate a large amount of energy. Spontaneous fission, discovered (1941) by the Russian physicists G.N. Flerov and K.A.
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  • Nuclear Fission: Basics. When a nucleus fissions, it splits into several smaller fragments. These fragments, or fission products, are about equal to half the original mass. Two or three neutrons are also emitted.
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  • In the reactions of spontaneous nuclear fission the absorption of a neutron is not necessary . The rate of spontaneous nuclear fission is the probability per second that a given atom is fired spontaneously - that is, without any external intervention. Plutonium 239 has a very high rate of spontaneous fission compared to the rate of spontaneous fission of uranium 235.
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  • Spontaneous nuclear fission is an extremely rare phenomenon. Much more common is the fission induced by the capture of a neutron, a nuclear reaction which can be considered as a disintegration into two fragments of the nucleus, triggered by this capture.
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  • PDF | This paper summarizes part of the work on spontaneous nuclear fission performed at Los Alamos before 1945. The experimental technique used to detect spontaneous fission in the heavy alpha ...
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  • Nuclear Fission and Fusion. STUDY. PLAY. Fission. The process in which a very heavy nucleus splits into two lighter nuclei, releasing energy in the process. Spontaneous nuclear fission. Unstable, heavy, nuclei spontaneously split into two smaller nuclei in order to become more stable.
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  • Spontaneous nuclear fission processes occur by? chain reactions. How does fission happen? Nuclear fission, the fission or "splitting" of an atomic nucleus, can happen in two basic ways. One is a ...
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  • The spontaneous nuclear fission rate is the probability per second that a given atom will fission spontaneously--that is, without any external intervention. In nuclear power plants, nuclear fission is controlled by a medium such as water in the nuclear reactor. The water acts as a heat transfer medium to cool down the reactor and to slow down ...
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  • OF HEAVY NUCLEI IN THE FRAMEWORK OF DINUCLEAR SYSTEM CONCEPTION V.V.Volkov a, E.A.Cherepanova,1, Sh.A.Kalandarova,b a Joint Institute for Nuclear Research, Dubna b Institute of Nuclear Physics, Tashkent A new approach to the interpretation of the process of spontaneous ˇssion of heavy nuclei is suggested.
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  • A high-energy fission fragment from the spontaneous nuclear fission of 252 Cf, penetrating a sample of insulin, penicillin or an unknown protein, decomposes most of what is in its path, but occasionally, an intact molecular ion of the sample is ejected from the surface of the fission track into the vacuum of a mass spectrometer where its ...
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  • In nuclear fusion, after 100,000,000 degrees is reached, a thermonuclear reaction takes place, and the 2 isotopes of hydrogen are combined, forming helium, after fusion takes place, is is self sustaining, putting out more energy than put in.
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  • Atoms that fission spontaneously are only metastable. That is, they are not actually stable bound states but are just temporary resonances. The cause of their decay is that instability and you could perfectly well say that the cause of their decay...
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  • Spontaneous nuclear fission can occur by the emission of alpha and beta particles. Other mechanisms involve positrons and gamma rays. ALPHA PARTICLES: An alpha particle is a helium nucleus. The heavier elements usually decay by alpha emission. For example, ""_92^238U → _90^234Th + _2^4He BETA PARTICLES: A beta particle is an electron. Nuclei that have too few protons can decay by converting ...
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