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In the broadest sense, cold fusion is any type of nuclear fusion accomplished without the high temperatures (millions of degrees Celsius) required for thermonuclear fusion. In common usage, "cold fusion" refers more narrowly to a postulated fusion process of unknown mechanism offered to explain a group of experimental results first reported by electrochemists Stanley Pons of the University of Utah and Martin Fleischmann of the University of Southampton.

Cold fusion gained attention in 1989 when Fleischmann and Pons held a news conference in which they reported producing nuclear fusion in a tabletop experiment involving electrolysis of heavy water on a palladium (Pd) electrode. They reported anomalous heat production ("excess heat") of a magnitude they asserted would defy explanation except in terms of nuclear processes. They further reported measuring small amounts of nuclear reaction byproducts, including neutrons and tritium. These reports raised hopes of a cheap and abundant source of energy.

Enthusiasm turned to skepticism and scorn as a long series of failed replication attempts were weighed in view of several theoretical reasons cold fusion should not be possible, the discovery of possible sources of experimental error, and finally the discovery that Fleischmann and Pons had not actually detected nuclear reaction byproducts. Although cold fusion has gained a reputation as pathological science, some researchers continue to investigate cold fusion and publish their findings at conferences, in books, and scientific journals. The field is sometimes referred to as low energy nuclear reaction (LENR) studies or condensed matter nuclear science.

The majority of a review panel organized by the US Department of Energy (DOE) in 1989 found that the evidence for the discovery of a new nuclear process was not persuasive. In 2004, the DOE convened a second cold fusion review panel which reached conclusions that were similar to those of the 1989 panel.

History

Early work

The ability of palladium to absorb hydrogen was recognized as early as the nineteenth century by Thomas Graham. In the late nineteen-twenties, two Austrian born scientists, Friedrich Paneth and Kurt Peters (German Misplaced Pages article), originally reported the transformation of hydrogen into helium by spontaneous nuclear catalysis when hydrogen was absorbed by finely divided palladium at room temperature. However, the authors later acknowledged that the helium they measured was due to background from the air.

In 1927, Swedish scientist J. Tandberg stated that he had fused hydrogen into helium in an electrolytic cell with palladium electrodes. On the basis of his work, he applied for a Swedish patent for "a method to produce helium and useful reaction energy". After deuterium was discovered in 1932, Tandberg continued his experiments with heavy water. Due to Paneth and Peters' retraction, Tandberg's patent application was eventually denied.

The term "cold fusion" was coined by E. Paul Palmer of Brigham Young University in 1986 in an investigation of "geo-fusion", or the possible existence of fusion in a planetary core.

Fleischmann-Pons announcement

Fleischmann and Pons hypothesized that the high compression ratio and mobility of deuterium that could be achieved within palladium metal using electrolysis might result in nuclear fusion. To investigate, they conducted electrolysis experiments using a palladium cathode and heavy water within a calorimeter, an insulated vessel designed to measure process heat. Current was applied continuously for many weeks, with the heavy water being renewed at intervals. Some deuterium was thought to be accumulating within the cathode, but most was allowed to bubble out of the cell, joining oxygen produced at the anode. For most of the time, the power input to the cell was equal to the calculated power leaving the cell within measurement accuracy, and the cell temperature was stable at around 30 °C. But then, at some point (and in some of the experiments), the temperature rose suddenly to about 50 °C without changes in the input power. These high temperature phases would last for two days or more and would repeat several times in any given experiment once they had occurred. The calculated power leaving the cell was significantly higher than the input power during these high temperature phases. Eventually the high temperature phases would no longer occur within a particular cell.

In 1988, Fleischmann and Pons applied to the United States Department of Energy for funding towards a larger series of experiments. Up to this point they had been funding their experiments using a small device built with $100,000 out-of-pocket. The grant proposal was turned over for peer review, and one of the reviewers was Steven E. Jones of Brigham Young University. Jones had worked on muon-catalyzed fusion for some time, and had written an article on the topic entitled "Cold nuclear fusion" that had been published in Scientific American in July 1987. Fleischmann and Pons and co-workers met with Jones and co-workers on occasion in Utah to share research and techniques. During this time, Fleischmann and Pons described their experiments as generating considerable "excess energy", in the sense that it could not be explained by chemical reactions alone. They felt that such a discovery could bear significant commercial value and would be entitled to patent protection. Jones, however, was measuring neutron flux, which was not of commercial interest. In order to avoid problems in the future, the teams appeared to agree to simultaneously publish their results, although their accounts of their March 6 meeting differ.

In mid-March, both research teams were ready to publish their findings, and Fleischmann and Jones had agreed to meet at an airport on March 24 to send their papers to Nature via FedEx. Fleischmann and Pons, however, broke their apparent agreement, submitting their paper to the Journal of Electroanalytical Chemistry on March 11, and disclosing their work via a press conference on March 23. Jones, upset, faxed in his paper to Nature after the press conference.

Reaction to the announcement

Fleischmann and Pons' anouncement drew wide media attention. Scores of laboratories in the United States and abroad attempted to repeat the experiments. A few reported success, many others failure. Even those reporting success had difficulty reproducing Fleischmann and Pons' results. One of the more prominent reports of success came from a group at the Georgia Institute of Technology, which observed neutron production. The Georgia Tech group later retracted their announcement. Another team, headed by Robert Huggins at Stanford University also reported early success, but this too was refuted. For weeks, competing claims, counterclaims and suggested explanations kept what was referred to as "cold fusion" or "fusion confusion" in the news.

In May 1989, the American Physical Society held a session on cold fusion, at which were heard many reports of experiments that failed to produce evidence of cold fusion. At the end of the session, eight of the nine leading speakers stated they considered the initial Fleischmann and Pons' claim dead.

In April 1989, Fleischmann and Pons published a "preliminary note" in the Journal of Electroanalytical Chemistry. This paper notably showed a gamma peak without its corresponding Compton edge, which indicated they had made a mistake in claiming evidence of fusion byproducts. The preliminary note was followed up a year later with a much longer paper that went into details of calorimetry but did not include any nuclear measurements.

In July and November 1989, Nature published papers critical of cold fusion claims.

Nevertheless, Fleischmann and Pons and a number of other researchers who found positive results remained convinced of their findings. In August of 1989, the state of Utah invested $4.5 million to create the National Cold Fusion Institute.

The United States Department of Energy organized a special panel to review cold fusion theory and research. The panel issued its report in November 1989, concluding that results as of that date did not present convincing evidence that useful sources of energy would result from phenomena attributed to cold fusion. The panel noted the inconsistency of reports of excess heat and the greater inconsistency of reports of nuclear reaction byproducts. Nuclear fusion of the type postulated would be inconsistent with current understanding and would require the invention of an entirely new nuclear process. The panel was against special funding for cold fusion research, but supported modest funding of "focused experiments within the general funding system."

In the ensuing years, several books came out critical of cold fusion research methods and the conduct of cold fusion researchers.

Theoretical issues

Postulating cold fusion to explain experimental results raises at least three separate theoretical problems.

The probability of reaction

Because nuclei are all positively charged, they strongly repel one another. Normally, very high energies are required to overcome this repulsion. Extrapolating from known rates at high energies, the rate at room temperature would be 50 orders of magnitude lower than needed to account for the reported excess heat.

The branching ratio

Fusion is a two-step process. In the case of deuterium fusion, the first step is combination to form a high energy intermediary:

D + D → He + 24 MeV

In high energy experiments, this intermediary has been observed to quickly decay through three pathways:

n + He + 3.3 MeV (50%)

p + H + 4.0 MeV (50%)

He + γ + 24 MeV (10)

The first two pathways are equally probable, and if one watt of nuclear power were produced, the neutron and tritium production would be easy to measure. Based on attempts to detect neutrons and tritium (H), the actual rates of the first two pathways are at least five orders of magnitude too low, meaning the branching probabilities given above would have to be completely reversed to strongly favor the third pathway.

γ-ray conversion to heat

The γ-rays of the He pathway, are not observed. This type of radiation is not stopped by electrode or electrolyte materials, making it necessary to postulate that the 24 MeV excess energy is transferred into the host metal lattice prior to the intermediary's decay. The speed of the decay process together with the inter-atomic spacing makes such a transfer inexplicable in terms of conventional understandings of momentum and energy transfer.

Further developments

Cold fusion claims were, and still are, considered extraordinary. In view of the theoretical issues alone, most scientists would require extraordinarily conclusive data to be convinced that cold fusion has been discovered. After the fiasco following the Pons and Fleischmann announcement, most scientists became dismissive of new experimental claims.

In 2004, at the request of cold fusion advocates, the DOE organized a second review of the field. 18 reviewers in total examined the written and oral testimony given by cold fusion researchers. On the question of excess heat, the reviewers' opinions ranged from "evidence of excess heat is compelling" to "there is no convincing evidence that excess power is produced when integrated over the life of an experiment". The report states the reviewers were split approximately evenly on this topic. On the larger question of evidence for nuclear fusion, the report states:

Two-thirds of the reviewers...did not feel the evidence was conclusive for low energy nuclear reactions, one found the evidence convincing, and the remainder indicated they were somewhat convinced. Many reviewers noted that poor experiment design, documentation, background control and other similar issues hampered the understanding and interpretation of the results presented.

On the question of further research, the report reads:

The nearly unanimous opinion of the reviewers was that funding agencies should entertain individual, well-designed proposals for experiments that address specific scientific issues relevant to the question of whether or not there is anomalous energy production in Pd/D systems, or whether or not D-D fusion reactions occur at energies on the order of a few eV. These proposals should meet accepted scientific standards, and undergo the rigors of peer review. No reviewer recommended a focused federally funded program for low energy nuclear reactions.

Cold fusion research

Experimental setups

A cold fusion experiment usually includes:

• a metal, such as palladium or nickel, in bulk, thin films or powder;
• deuterium and/or hydrogen, in the form of water, gas or plasma; and
• an excitation in the form of electricity, magnetism, temperature, pressure, laser beam(s), or of acoustic waves.

Electrolysis cells can be either open cell or closed cell. In open cell systems, the electrolyis products, which are gaseous, are allowed to leave the cell. In closed cell experiments, the products are captured, for example by catalytically recombining the products in a separate part of the experimental system. These experiments generally strive for a steady state condition, with the electrolyte being replaced periodically. There are also "heat after death" experiments, where the evolution of heat is monitored after the electric current is turned off.

Excess heat observations

An excess heat observation is based on an energy balance. Various sources of energy input and output are continuously measured. Under normal condition, the energy input can be matched to the energy output to within experimental error. In experiments such as those run by Fleischmann and Pons, a cell operating steadily at one temperature transitions to operating at a higher temperature with no increase in applied current. At the higher temperature, the energy balance shows an unaccounted term. In the Fleischmann and Pons experiments, the rate of excess heat generation was in the range of 10-20% of total input. The high temperature condition would last for an extended period, making the total excess heat disproportionate to what might be obtained by ordinary chemical reaction of the material contained within the cell at any one time. These high temperature phases did not last indefinitely and did not occur in every experiment, but in those experiments where they did occur, they would usually reoccur several times. Many others have reported similar results.

A 2007 review determined that more than 10 groups world wide reporting measurements of excess heat in 1/3 of their experiments using electrolysis of heavy water in open and/or closed electrochemical cells, or deuterium gas loading onto Pd powders under pressure. Most of the research groups reported occasionally seeing 50-200% excess heat for periods lasting hours or days.

In 1993, Fleischmann reported "heat-after-death" experiments: he observed the continuing generation of excess heat after the electric current supplied to the electrolytic cell was turned off. Similar observations have been reported by others as well.

Reports of nuclear products in association with excess heat

In association with excess heat, researchers have reported observing gamma rays, neutrons, and tritium (H) production. Although these reports do not measure quantities commensurate with a rate of deuterium fusion that would account for the excess heat, the quantities were reported to be in excess of background levels.

Considerable attention has been given to measuring He production. In the report presented to the DOE in 2004, He was detected in five out of sixteen cases where electrolytic cells were producing excess heat, although the amounts detected were very close to background levels and contamination by trace amounts of helium normally present in the air is difficult to avoid.

Evidence for nuclear transmutations

There have been reports that small amounts of copper and other metals can appear within Pd electrodes used in cold fusion experiments. Iwamura et al. report transmuting Cs to Pr and Sr to Mo, with the mass number increasing by 8, and the atomic number by 4 in either case.. Cs or Sr was applied to the surface of a Pd complex consisting of a thin Pd layer, alternating CaO and Pd layers, and bulk Pd. Deuterium was diffused through this complex. The surface was analyzed periodically with X-ray photoelectron spectroscopy and at the end of the experiment with glow discharge mass spectrometry. Production of such heavy nuclei is so unexpected from current understanding of nuclear reactions that extraordinary experimental proof will be needed to convince the scientific community of these results.

Non-nuclear explanations for excess heat

The calculation of excess heat in electrochemical cells involves certain assumptions. Errors in these assumptions have been offered as non-nuclear explanations for excess heat.

One assumption made by Fleishmann and Pons is the efficiency of electrolysis is nearly 100%, meaning they assumed nearly all the electricity applied to the cell resulted in electrolysis of water, with negligible resistive heating and substantially all the electrolysis product leaving the cell unchanged. This assumption gives the amount of energy expended converting liquid D₂O into gaseous D₂ and O₂.

The efficiency of electrolysis will be less than one if hydrogen and oxygen recombine to a significant extent within the calorimeter. Several researchers have described potential mechanisms by which this process could occur and thereby account for excess heat in electrolyis experiments.

Another assumption is that heat loss from the calorimeter maintains the same relationship with measured temperature as found when calibrating the calorimeter. This assumption ceases to be accurate if the temperature distribution within the cell becomes significantly altered from the condition under which calibration measurements were made. This can happen, for example, if fluid circulation within the cell becomes significantly altered. Recombination of hydrogen and oxygen within the calorimeter would also alter the heat distribution and invalidate the calibration.

Theoretical work

Cold fusion researchers acknowledge the theoretical issues and have proposed various speculative theories (for a full review, see Storms 2007) to explain the reported observations. None has received mainstream acceptance.

Analysis of factors affecting reproducibility

The 1989 DOE review commented that it was difficult to resolve cold fusion claims because any good experiment that failed to find proof of cold fusion could be indiscriminately discounted as not working for unknown reasons.

Although the review panel was not convinced, the cold fusion researchers who presented their review document to the 2004 DOE panel on cold fusion said that the observation of excess heat has been reproduced, that it can be reproduced at will under the proper conditions, and that many of the reasons for failure to reproduce it have been discovered.

See also

• Bubble fusion

References

1. Voss 1999
2. Fleischmann & Pons 1989, p. 301 ("It is inconceivable that this could be due to anything but nuclear processes.")
3. Fleischmann & Pons 1989, p. 301 ("We realise that the results reported here raise more questions than they provide answers . . .")
4. Browne 1989, para. 1 harvnb error: multiple targets (2×): CITEREFBrowne1989 (help)
5. Browne (1989-05-03). "Fusion Claims is Greeted With Scorn by Physicists". The New York Times. pp. A1, A22.
6. Browne 1989 harvnb error: multiple targets (2×): CITEREFBrowne1989 (help),Close 1992, Huizenga 1993,Taubes 1993
7. Voss 1999,Platt 1998,Goodstein 1994,Van Noorden 2007,Beaudette 2002,Feder 2005,Hutchinson 2006,Kruglinksi 2006,Adam 2005
8. Biberian 2007,Hagelstein et al. 2004
9. Choi 2005,Feder 2005,US DOE 2004
10. ^ US DOE 1989, p. 7
11. Paneth and Peters 1926
12. Kowalski 2004, II.A2
13. ^ Fleischmann & Pons 1989, p. 301
14. ^ Fleischmann et al. 1990
15. ^ Crease & Samios 1989, p. V1
16. ^ Fleischmann et al. 1990, p. 293
17. ^ Lewenstein 1994, p. 8
18. ^ Browne 1989 harvnb error: multiple targets (2×): CITEREFBrowne1989 (help)
19. Schaffer 1999, p. 1
20. Broad 1989
21. Wilford 1989
22. Broad, William J. 19 April 1989. Stanford Reports Success, The New York Times.
23. Browne, Malcolm W. 3 May 1989. Physicists Debunk Claim Of a New Kind of Fusion, The New York Times
24. Bowen 1989
25. Tate 1989, p. 1 harvnb error: no target: CITEREFTate1989 (help)
26. Platt 1998
27. Gai et al. 1989, pp. 29–34
28. Williams et al. 1989, pp. 375–384
29. Joyce 1990
30. US DOE 1989, p. 39
31. ^ US DOE 1989, p. 36
32. US DOE 1989, p. 37
33. Taubes 1993, Close 1992, Huizenga 1993, Park 2000}
34. Schaffer 1999, p. 1, Scaramuzzi 2000, p. 4 ("It has been said . . . three 'miracles' are necessary")
35. Schaffer 1999, p. 1
36. Schaffer and Morrison 1999, p. 1,3
37. Scaramuzzi 2000, p. 4, Goodstein 1994
38. Schaffer 1999, p. 1, Scaramuzzi 2000, p. 4, Goodstein 1994
39. Schaffer 1999, p. 2, Scaramuzzi 2000, p. 4
40. Schaffer 1999, p. 2
41. Schaffer 1999, p. 2, Scaramuzzi 2000, p. 4 , Goodstein 1994 (explaining Pons and Fleischmann would both be dead if they had produced neutrons in proportion to their measurements of excess heat)
42. Schaffer 1999, p. 2, Scaramuzzi 2000, p. 4
43. Goodstein 1994, Scaramuzzi 2000, p. 4
44. Schaffer 1999, p. 3
45. Schaffer 1999, p. 3, Adam 2005 - ("Extraordinary claims . . . demand extraordinary proof")
46. Schaffer and Morrison 1999, p. 3 ("You mean it's not dead?" – recounting a typical reaction to hearing a cold fusion conference was held recently)
47. US DOE 2004
48. Storms 2007, p. 144-150
49. Fleischmann 1990 harvnb error: no target: CITEREFFleischmann1990 (help)
50. US DOE 2004, p. 3
51. ^ Hubler 2007
52. Oriani et al. 1990, pp. 652–662, cited by Storms 2007, p. 61
53. Bush et al. 1991, cited by Biberian 2007
54. e.g. Storms 1993 harvnb error: no target: CITEREFStorms1993 (help), Hagelstein et al. 2004
55. Miles et al. 1993 harvnb error: no target: MilesE (help)
56. e.g. Arata & Zhang 1998, Hagelstein et al. 2004
57. Gozzi 1998, cited by Biberian 2007
58. Fleischmann 1993
59. Mengoli 1998
60. Szpak 2004
61. Storms 2007, Mosier-Boss et al. 2008
62. Hagelstein et al. 2004
63. Hagelstein et al. 2004, Schaffer 1999, p. 2
64. Storms 2007, p. 93-95
65. ^ Iwamura, Sakano & Itoh 2002, pp. 4642–4650
66. Schaffer 1999, p. 2
67. Biberian 2007 - (Input power is calculated by multiplying current and voltage, and output power is deduced from the measurement of the temperature of the cell and that of the bath")
68. Fleishmann 1990 harvnb error: no target: CITEREFFleishmann1990 (help)
69. Fleishmann 1990, Appendix harvnb error: no target: CITEREFFleishmann1990 (help)
70. Shkedi et al. 1995
71. Jones et al. 1995, p. 1
72. ^ Shanahan 2002
73. Fleishmann 1990 harvnb error: no target: CITEREFFleishmann1990 (help),
74. Biberian 2007 - ("Almost all the heat is dissipated by radiation and follows the temperature fourth power law. The cell is calibrated . . .")
75. Browne 1989, para. 16 harvnb error: multiple targets (2×): CITEREFBrowne1989 (help)
76. Wilson 1992
77. Shanahan 2005
78. Shanahan 2006
79. Biberian 2007
80. Hagelstein et al. 2004, p. 3, 14

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