Difference between revisions of "Cockcroft and Walton Experiment"

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(But in fact the overall energy expended to attain this transmutation is greater than the energy produced by it.)
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This '''experiment''' by [[John Cockcroft]] and [[Ernest Walton]] is claimed by some{{fact}} physicists as demonstrating that ''[[E=mc2|E=mc<sup>2</sup>]]''.<ref>[http://cerncourier.com/cws/article/cern/31864 Mike Poole ''Cockcroft's subatomic legacy: splitting the atom''], Cern Courier, Nov 20, 2007</ref>
 
This '''experiment''' by [[John Cockcroft]] and [[Ernest Walton]] is claimed by some{{fact}} physicists as demonstrating that ''[[E=mc2|E=mc<sup>2</sup>]]''.<ref>[http://cerncourier.com/cws/article/cern/31864 Mike Poole ''Cockcroft's subatomic legacy: splitting the atom''], Cern Courier, Nov 20, 2007</ref>
  
Conducted in April 1932 at the [[University of Cambridge]]'s [[Cavendish Laboratory]] in England,  the physicists Cockroft and Walton successfully split [[lithium]] atom [[nucleus|nuclei]] by colliding them with artificially accelerated protons. This experiment is general hailed as being the first [[transmutation]] of an element using artificially accelerated particles, for which they were honored with the [[Nobel Prize]] in 1951<ref>[http://www.nobelprize.org/nobel_prizes/physics/laureates/1951/  ''The Nobel Prize in Physics 1951''], Nobelprize.org, 23 Jan 2013</ref>.
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Conducted in April 1932 at the [[University of Cambridge]]'s [[Cavendish Laboratory]] in England,  the physicists Cockroft and Walton successfully split [[lithium]] atom [[nucleus|nuclei]] by colliding them with artificially accelerated protons. This experiment is general hailed as being the first [[transmutation]] of an element using artificially accelerated particles, for which they were honored with the [[Nobel Prize]] in 1951.<ref>[http://www.nobelprize.org/nobel_prizes/physics/laureates/1951/  ''The Nobel Prize in Physics 1951''], Nobelprize.org, 23 Jan 2013</ref>
  
 
Critics maintain that such verification is impossible due to the utter lack of any logical justification for that science fiction formula.
 
Critics maintain that such verification is impossible due to the utter lack of any logical justification for that science fiction formula.
  
Since the experiment showed that mass could be converted directly into energy through [[nuclear transmutation]] it is generally seen as being an impressive verification of [[Albert Einstein]]'s famous ''[[E=mc2|E=mc<sup>2</sup>]]'' formula<ref>[http://www.aip.org/history/einstein/emc1.htm The Center for History of Physics: ''Einstein: Image and Impact], © 1996-2004 - American Institute of Physics</ref><ref>[http://homepage.eircom.net/~louiseboylan/Pages/Cockroft_walton.htm Louise Boylan:] ''Cockroft and Walton Experiment: Converting Mass into Energy''</ref>.  
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Neither the Nobel Prize committee nor the prize recipients made the claim that their experiment verified of [[Albert Einstein]]'s famous ''[[E=mc2|E=mc<sup>2</sup>]]'' formula,<ref>[http://www.aip.org/history/einstein/emc1.htm The Center for History of Physics: ''Einstein: Image and Impact], © 1996-2004 - American Institute of Physics</ref><ref>[http://homepage.eircom.net/~louiseboylan/Pages/Cockroft_walton.htm Louise Boylan:] ''Cockroft and Walton Experiment: Converting Mass into Energy''</ref> for which no logical derivation has ever been forthcoming.
  
 
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Instead, a hand-waving claim was made that an excess in kinetic energy of the resultant helium nuclei, which is greater than the energy of the original nuclei, must be attributable to a loss in mass.  But in fact the overall energy expended to attain this transmutation is greater than the energy produced by it.
(explain experiment)
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== References ==
 
== References ==

Revision as of 22:19, 23 January 2013

This experiment by John Cockcroft and Ernest Walton is claimed by some[Citation Needed] physicists as demonstrating that E=mc2.[1]

Conducted in April 1932 at the University of Cambridge's Cavendish Laboratory in England, the physicists Cockroft and Walton successfully split lithium atom nuclei by colliding them with artificially accelerated protons. This experiment is general hailed as being the first transmutation of an element using artificially accelerated particles, for which they were honored with the Nobel Prize in 1951.[2]

Critics maintain that such verification is impossible due to the utter lack of any logical justification for that science fiction formula.

Neither the Nobel Prize committee nor the prize recipients made the claim that their experiment verified of Albert Einstein's famous E=mc2 formula,[3][4] for which no logical derivation has ever been forthcoming.

Instead, a hand-waving claim was made that an excess in kinetic energy of the resultant helium nuclei, which is greater than the energy of the original nuclei, must be attributable to a loss in mass. But in fact the overall energy expended to attain this transmutation is greater than the energy produced by it.

References

  1. Mike Poole Cockcroft's subatomic legacy: splitting the atom, Cern Courier, Nov 20, 2007
  2. The Nobel Prize in Physics 1951, Nobelprize.org, 23 Jan 2013
  3. The Center for History of Physics: Einstein: Image and Impact, © 1996-2004 - American Institute of Physics
  4. Louise Boylan: Cockroft and Walton Experiment: Converting Mass into Energy