cold fusion


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cold fusion

or

low-temperature fusion,

nuclear fusion of deuterium, an isotope of hydrogenhydrogen
[Gr.,=water forming], gaseous chemical element; symbol H; at. no. 1; interval in which at. wt. ranges 1.00784–1.00811; m.p. −259.14°C;; b.p. −252.87°C;; density 0.08988 grams per liter at STP; valence usually +1.
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, at or relatively near room temperature. Fusion, the reaction involved in the release of the destructive energy of a hydrogen bombhydrogen bomb
or H-bomb,
weapon deriving a large portion of its energy from the nuclear fusion of hydrogen isotopes. In an atomic bomb, uranium or plutonium is split into lighter elements that together weigh less than the original atoms, the remainder of the mass
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, requires extremely high temperatures, and investigations of fusion as a possible energy source have focused on the problems involved in designing an apparatus to contain and sustain such a reaction (see nuclear energynuclear energy,
the energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these processes a small amount of mass is converted to energy according to the relationship E = mc2, where E is energy, m
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; nuclear reactornuclear reactor,
device for producing controlled release of nuclear energy. Reactors can be used for research or for power production. A research reactor is designed to produce various beams of radiation for experimental application; the heat produced is a waste product and is
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). In 1989 B. Stanley Pons and Martin Fleischmann, chemists at the Univ. of Utah, announced that an experiment conducted at room temperature using platinum and palladium electrodes immersed in heavy water (deuterium oxide) had produced excess heat and other byproducts that they ascribed to a fusion reaction. Attempts to replicate their experiment produced initially conflicting results, but several early announcements of experimental confirmation were later retracted. Pons and Fleischmann were also later criticized for having skewed data to show the emission of gamma rays at an energy level typical of fusion.

Research into the possibility of low-energy nuclear reactions (as the field is also called) nonetheless continues, because of intriguing but inconclusive experimental results—such as claims of the production of excess heat, helium, or tritium where heavy water reacts with metals—and because of the desirability of producing relatively nonpolluting fusion energy in quantity at any temperature. Cold-fusion proponents believe that the fusion mechanism is different from that of "hot fusion" in that it encompasses some type of unusual nuclear reaction in the metal lattice involving deuterium and possibly other atoms. Several dozen models to explain the observed phenomena have been advanced, but none accounts for the full range of experimental observations.

Bibliography

See F. David Peat, Cold Fusion: The Making of a Scientific Controversy (1989); F. E. Close, Too Hot to Handle: The Race for Cold Fusion (1991); J. R. Huizenga, Cold Fusion: The Scientific Fiasco of the Century (1993); G. Taubes, Bad Science: The Short Life and Weird Times of Cold Fusion (1993).

References in periodicals archive ?
At the University of Hawaii, Liebert and materials scientist Bor Yann Liaw obtained suggestive results last year from a different type of cold fusion experiment.
And now, Navy and academic chemists say their results add weight to the claim that cold fusion can occur.
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The team continues to search for a reproducible reference experiment for cold fusion.
When electrolysis is performed using heavy water (deuterium) and a palladium cathode, unexpected heat and Helium-4 can be generated indicating that nuclear fusion is taking place without the usual products of hot fusion (this is called LENR or cold fusion).
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Research on "cold fusion" persists on the fringes of the scientific world.
Stanley Pons report on benchtop nuclear reactions that they describe as "cold fusion" but that are never confirmed (4/1/89, p.
Claims that scientists at the biggest particle accelerator in the world have detected particles traveling faster than the speed of light have led to more hyperventilating than anything in the world of physics since cold fusion. "Everything we know about the universe is wrong," declared Washington Post columnist Charles Krauthammer.
In this summary, I wish to illustrate a topic concerning the controversial phenomenon known as cold fusion. I'm working out a complete theory of the process of interaction of deuterium gas in a lattice of palladium, in which the key point is the existence of micro-crack and micro-explosions, in the absence of radioactive nuclides, ie, clean energy as a result, within the deuterated lattices, considering particularly the quantum theory.
In this article we have presented the basic concepts and theories involved in the cold fusion processes for Physics students in a simple and popular version.
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