Bubble fusion, also known as sonofusion, is the non-technical name for a nuclear fusion reaction hypothesized to occur inside extraordinarily large collapsing gas bubbles created in a liquid during acoustic cavitation.1 Rusi Taleyarkhan and collaborators claimed to have observed evidence of sonofusion in 2002. The claim was quickly surrounded by controversy, including allegations ranging from experimental error to academic fraud. Subsequent publications claiming independent verification of sonofusion were also highly controversial. Eventually, an investigation by Purdue University found that Taleyarkhan had engaged in falsification of independent verification, and had included a student as an author on a paper when he hadn't participated in the research. He was subsequently stripped of his professorship. One of his funders, the Office of Naval Research reviewed the report by Purdue, and deemed that the behavior was "so severe as to merit debarment", and barred him from federal funding for 28 months.2 None of the investigations examined the research itself.
US patent 4,333,796,3 filed by Hugh Flynn in 1978, appears to be the earliest documented reference to a sonofusion-type reaction.
In the March 8, 2002 issue of the peer-reviewed journal Science, Rusi P. Taleyarkhan and colleagues at the Oak Ridge National Laboratory (ORNL) reported that acoustic cavitation experiments conducted with deuterated acetone (C3D6O) showed measurements of tritium and neutron output consistent with the occurrence of fusion. The neutron emission was also reported to be coincident with the sonoluminescence pulse, a key indicator that its source was fusion caused by the heat and pressure inside the collapsing bubbles.4
The results were so startling that the Oak Ridge National Laboratory asked two independent researchers, D. Shapira and M. J. Saltmarsh, to repeat the experiment using more sophisticated neutron detection equipment. They reported that the neutron release was consistent with random coincidence.56 A rebuttal by Taleyarkhan and the other authors of the original report argued that the Shapira and Saltmarsh report failed to account for significant differences in experimental setup, including over an inch of shielding between the neutron detector and the sonoluminescing acetone. According to Taleyarkhan et al., when properly considering those differences, the results were consistent with fusion.7
As early as 2002, while experimental work was still in progress, Aaron Galonsky of Michigan State University, in a letter to the journal Science8 expressed doubts about the claim made by the Taleyarkhan team. In Galonsky's opinion, the observed neutrons were too high in energy to be from a deuterium-deuterium (d-d) fusion reaction. In their response (published on the same page), the Taleyarkhan team provided detailed counter-arguments and concluded that the energy was "reasonably close" to that which was expected from a fusion reaction.
In February 2005 the documentary series Horizon commissioned two leading sonoluminescence researchers, Seth Putterman9 and Kenneth S. Suslick, to reproduce Taleyarkhan's work. Using similar acoustic parameters, deuterated acetone, similar bubble nucleation, and a much more sophisticated neutron detection device, the researchers could find no evidence of a fusion reaction.1011
In 2004, new reports of bubble fusion were published by the Taleyarkhan group, claiming that the results of previous experiments had been replicated under more stringent experimental conditions.1213 These results differed from the original results in that fusion was claimed to occur over longer times than previously reported. The original report only claimed neutron emission from the initial bubble collapse following bubble nucleation, whereas this report claimed neutron emission many acoustic cycles later.
In July 2005, two of Taleyarkhan's students at Purdue University published evidence confirming the previous result. They used the same acoustic chamber, the same deuterated acetone fluid and a similar bubble nucleation system. In this report, no neutron-sonoluminescence coincidence was attempted.1415 An article in Nature raised issues about the validity of the research and complaints from his Purdue colleagues (see full analysis elsewhere in this page).1617 Charges of misconduct were raised, and Purdue University opened an investigation. It concluded in 2008 that Taleyarkhan's name should have appeared in the author list because of his deep involvement in many steps of the research, that he added one author that had not really participated in the paper just to overcome the criticism of one reviewer, and that this was part of an attempt of "an effort to falsify the scientific record by assertion of independent confirmation". The investigation did not address the validity of the experimental results.18
In January 2006, a paper published in the journal Physical Review Letters by Taleyarkhan in collaboration with researchers from Rensselaer Polytechnic Institute reported statistically significant evidence of fusion.19
In November 2006, in the midst of accusations concerning Taleyarkhan's research standards, two different scientists visited the meta-stable fluids research lab at Purdue University to measure neutrons, using Taleyarkhan's equipment. Dr. Edward R. Forringer and undergraduates David Robbins and Jonathan Martin of LeTourneau University presented two papers at the American Nuclear Society Winter Meeting that reported replication of neutron emission. Their experimental setup was similar to previous experiments in that it used a mixture of deuterated acetone, deuterated benzene, tetrachloroethylene and uranyl nitrate. Notably, however, it operated without an external neutron source and used two types of neutron detectors. They claimed a liquid scintillation detector measured neutron levels at 8 standard deviations above the background level, while plastic detectors measured levels at 3.8 standard deviations above the background. When the same experiment was performed with non-deuterated control liquid, the measurements were within one standard deviation of background, indicating that the neutron production had only occurred during cavitation of the deuterated liquid.20212223 William M. Bugg, emeritus physics professor at the University of Tennessee also traveled to Taleyarkhan's lab to repeat the experiment with his equipment. He also reported neutron emission, using plastic neutron detectors.23 Taleyarkhan claimed these visits counted as independent replications by experts, but Forringer later recognized that he was not an expert, and Bugg later said that Taleyarkhan performed the experiments and he had only watched.24
Reports as spectacular as the above raise a lot of doubt. In March 2006, Nature published a special report that called into question the validity of the results of the Purdue experiments.16 The report quotes Brian Naranjo of the University of California, Los Angeles to the effect that neutron energy spectrum reported in the 2006 paper by Taleyarkhan, et al. was statistically inconsistent with neutrons produced by the proposed fusion reaction and instead highly consistent with neutrons produced by the radioactive decay of Californium 252, an isotope commonly used as a laboratory neutron source .2524
The response of Taleyarkhan et al., published in Physical Review Letters, attempts to refute Naranjo's hypothesis as to the cause of the neutrons detected.26
Tsoukalas, head of the School of Nuclear Engineering at Purdue, and several of his colleagues at Purdue, had convinced Taleyarkhan to move to Purdue and attempt a joint replication. In the 2006 Nature report they detail several troubling issues when trying to collaborate with Taleyarkhan. He reported positive results from certain set of raw data, but his colleagues had also examined that set and it only contained negative results. He never showed his colleagues the raw data corresponding to the positive results, despite several requests. He moved the equipment from a shared laboratory to his own laboratory, thus impeding review by his colleagues, and he didn't give any advance warning or explanation for the move. Taleyarkhan convinced his colleagues that they shouldn't publish a paper with their negative results. Taleyarkhan then insisted that the university's press release presented his experiment as "peer-reviewed" and "independent", when the co-authors were working in his laboratory under his supervision, and his peers in the faculty were not allowed to review the data. In summary, Taleyarkhan's colleagues at Purdue said he placed obstacles to peer review of his experiments, and they had serious doubts about the validity of the research.1617
Nature also revealed that the process of anonymous peer-review had not been followed, and that the journal Nuclear Engineering and Design was not independent from the authors. Taleyarkhan was co-editor of the journal, and the paper was only peer-reviewed by his co-editor, with Taleyarkhan's knowledge.17
In 2002 Taleyarkhan filed a patent application on behalf of the United States Department of Energy, while working in Oak Ridge. Nature reported that the patent had been rejected in 2005 by the US Patent Office. The examiner called the experiment a variation of discredited cold fusion, found that there was "no reputable evidence of record to support any allegations or claims that the invention is capable of operating as indicated", and found that there was not enough detail for others to replicate the invention. The field of fusion suffered from many flawed claims, thus the examiner asked for additional proof that the radiation was generated from fusion and not from other sources. An appeal was not filed because the Department of Energy had dropped the claim in December 2005.17
Doubts among Purdue University's Nuclear Engineering faculty as to whether the positive results reported from sonofusion experiments conducted there were truthful prompted the university to initiate a review of the research, conducted by Purdue's Office of the Vice President for Research. In a March 9, 2006 article entitled "Evidence for bubble fusion called into question", Nature interviewed several of Taleyarkhan's colleagues who suspected something was amiss.27
On February 7, 2007, the Purdue University administration determined that "the evidence does not support the allegations of research misconduct and that no further investigation of the allegations is warranted". Their report also stated that "vigorous, open debate of the scientific merits of this new technology is the most appropriate focus going forward."2829 In order to verify that the investigation was properly conducted, House Representative Brad Miller requested full copies of its documents and reports by March 30, 2007.30 His congressional report concluded that "Purdue deviated from its own procedures in investigating this case and did not conduct a thorough investigation"; in response, Purdue announced that it would re-open its investigation.31
In June 2008, a multi-institutional team including Taleyarkhan published a paper in Nuclear Engineering and Design to "clear up misconceptions generated by a webposting of UCLA which served as the basis for the Nature article of March 2006", according to a press release.32
On July 18, 2008, Purdue University announced that a committee with members from five institutions had investigated 12 allegations of research misconduct against Rusi Taleyarkhan. It concluded that two allegations were founded—that Taleyarkhan had claimed independent confirmation of his work when in reality the apparent confirmations were done by Taleyarkhan's former students and was not as "independent" as Taleyarkhan implied, and that Taleyarkhan had included a colleague's name on one of his papers who had not actually been involved in the research ("the sole apparent motivation for the addition of Mr. Butt was a desire to overcome a reviewer's criticism," the report concluded).1833
Taleyarkhan's appeal of the report's conclusions was rejected. He said the two allegations of misconduct were trivial administrative issues and had nothing to do with the discovery of bubble nuclear fusion or the underlying science, and that "all allegations of fraud and fabrication have been dismissed as invalid and without merit — thereby supporting the underlying science and experimental data as being on solid ground".34 A researcher questioned by the LA Times said that the report had not clarified whether bubble fusion was real or not, but that the low quality of the papers and the doubts cast by the report had destroyed Taleyarkhan's credibility with the scientific community.35
Despite the findings against him, Taleyarkhan received a $185,000 grant from the National Science Foundation between September 2008 and August 2009 to investigate bubble fusion. In 2009 the Office of Naval Research debarred him for 28 months, until September 2011, from receiving U.S. Federal Funding. During that period his name was listed in the 'Excluded Parties List' to prevent him from receiving further grants from any government agency.2
- Chang, Kenneth (February 27, 2007). "Practical Fusion, or Just a Bubble?". New York Times. Retrieved 2007-02-27. "Dr. Putterman's approach is to use sound waves, called sonofusion or bubble fusion, to expand and collapse tiny bubbles, generating ultrahot temperatures. At temperatures hot enough, atoms can literally fuse and release even more energy than when they split in nuclear fission, now used in nuclear power plants and weapons. Furthermore, fusion is clean in that it does not produce long-lived nuclear waste."
- Reich, Eugenie Samuel (23 November 2009). "Bubble-fusion scientist debarred from federal funding". Nature. doi:10.1038/news.2009.1103.
- US 4333796, Flynn, Hugh G., "Method of generating energy by acoustically induced cavitation fusion and reactor therefor", issued 1982-06-08
- Taleyarkhan, R. P.; C. D. West; J. S. Cho; R. T. Lahey; Jr. R. Nigmatulin; R. C. Block (2002-03-08). "Evidence for Nuclear Emissions During Acoustic Cavitation". Science 295 (1868): 1868–73. Bibcode:2002Sci...295.1868T. doi:10.1126/science.1067589. ISSN 0036-8075. PMID 11884748. Retrieved 2007-05-13.
- Shapira, D.; M. J. Saltmarsh (19 August 2002). "Nuclear Fusion in Collapsing Bubbles — Is it There? An Attempt to Repeat the Observation of Nuclear Emissions from Sonoluminescence". Physical Review Letters 89 (10): 104302. Bibcode:2002PhRvL..89j4302S. doi:10.1103/PhysRevLett.89.104302.
- G. M. McCracken, Peter E. Stott (2005). "false trails". Fusion: the energy of the universe. Complementary science series (illustrated ed.). Elsevier Academic Press. pp. 91–92. ISBN 978-0-12-481851-4
- Haiko Lietz. "Bubble Fusion takes next hurdle". Retrieved 29 June 2012.
- Galonsky, A. (6 September 2002). "Tabletop Fusion Revisited". Science 297 (5587): 1645b. doi:10.1126/science.297.5587.1645b. ISSN 0036-8075. PMID 12216580.
- , Seth Putterman personal page.
- "Nuclear fusion 'put to the test'". BBC News. 17 February 2005. Retrieved 2007-05-13.
- "An Experiment to Save the World" (programme transcript). Horizon. BBC News. Retrieved 2007-05-13.
- Bourgeois, Theresa (2 March 2004). "Researchers Report Bubble Fusion Results Replicated: Physical Review E publishes paper on fusion experiment conducted with upgraded measurement system". RPI News & Information. Retrieved 2007-05-13.
- Taleyarkhan, R. P.; J. S. Cho; C. D. West; R. T. Lahey; R. I. Nigmatulin; R. C. Block (22 March 2004). "Additional Evidence of Nuclear Emissions During Acoustic Cavitation". Physical Review E 69 (letter 036109): 036109. Bibcode:2004PhRvE..69c6109T. doi:10.1103/PhysRevE.69.036109.
- Venere, Emil (12 July 2005). "Purdue findings support earlier nuclear fusion experiments". Purdue News (Purdue University). Retrieved 2007-05-13.
- Xu, Y.; A. Butt (3 May 2005). "Confirmatory Experiments for Nuclear Emissions During Acoustic Cavitation". Nuclear Engineering and Design 235 (1317): pp.1317–1324. doi:10.1016/j.nucengdes.2005.02.021. ISSN 0167-899X.
- "Bubble fusion: silencing the hype". Nature News. 8 March 2006. doi:10.1038/news060306-1.
- "Is bubble fusion simply hot air?". Nature News. 8 March 2006. doi:10.1038/news060306-2.
- "Report of the Investigation Committee In the Matter of Dr. Rusi P. Taleyarkhan" (PDF). Purdue University. 18 April 2008. Retrieved 2008-07-19.
- Peplow, Mark (10 January 2006). "Desktop fusion is back on the table". Nature. doi:10.1038/news060109-5.
- Taleyarkhan, R. P.; C. D. West; R. T. Lahey; R. I. Nigmatulin; J. S. Cho; R. C. Block; Y. Xu (January 2006). "Nuclear Emissions During Self-Nucleated Acoustic Cavitation". Physical Review Letters 96 (letter 034301): 034301. Bibcode:2006PhRvL..96c4301T. doi:10.1103/PhysRevLett.96.034301. PMID 16486709. "...Statistically significant nuclear emissions were observed for deuterated benzene and acetone mixtures but not for heavy water. The measured neutron energy was <=2.45 MeV, which is indicative of deuterium-deuterium (D-D) fusion. Neutron emission rates were in the range ~5×103 n/s to ~104 n/s and followed the inverse law dependence with distance..."
- "Using Sound Waves To Induce Nuclear Fusion With No External Neutron Source". Science Daily (Rensselaer Polytechnic Institute). 31 January 2006. Retrieved 2007-05-13. "...The experiment was specifically designed to address a fundamental research question, not to make a device that would be capable of producing energy, Block says...To verify the presence of fusion, the researchers used three independent neutron detectors and one gamma ray detector. All four detectors produced the same results: a statistically significant increase in the amount of nuclear emissions due to sonofusion when compared to background levels..."
- "Bubble Fusion Confirmed by LETU Research" LeTourneau University News (www.letu.edu/opencms/opencms/events/Bubble_Fusion_Confirmed_by_LETU_Research.html) link inactive as of 2008-05-10
- "Technical Sessions by Day (Wednesday)" (PDF). ANS 2006 Winter Meeting & Nuclear Technology Expo Official Program. November 12–16, 2006. p. 24. Retrieved 2006-12-06. (confirmation of presentation)
- Forringer, Edward R.; David Robbins; Jonathan Martin (12 November 2006). "Confirmation of Neutron Production During Self-Nucleated Acoustic Cavitation". Transactions of the American Nuclear Society v.95: p.736. ISSN 0003-018X.
- "Bubble Fusion Research Under Scrutiny", IEEE Spectrum, May 2006
- Vance, Erik (April 2, 2007), "The Bursting of Bubble Fusion", Chronicle of Higher Education
- Naranjo, Brian (3 October 2006). "Comment on 'Nuclear Emissions During Self-Nucleated Acoustic Cavitation'". Physical Review Letters 97 (letter 149403): 149403. arXiv:physics/0603060. Bibcode:2006PhRvL..97n9403N. doi:10.1103/PhysRevLett.97.149403.
- Taleyarkhan, R. P.; R. C. Block, R. T. Lahey, Jr., R. I. Nigmatulin, and Y. Xu (3 October 2006). "Taleyarkhan et al. Reply:". Physical Review Letters 97 (letter 149404): 149404. Bibcode:2006PhRvL..97n9404T. doi:10.1103/PhysRevLett.97.149404.
- Samuel Reich, Eugenie (9 March 2006). "Evidence for bubble fusion called into question". Nature 440 (7081): 132. Bibcode:2006Natur.440..132R. doi:10.1038/440132b. PMID 16525429.
- "Purdue integrity panel completes research inquiry". Purdue News (Purdue University). 7 February 2007. Retrieved 2007-05-13.
- Chang, Kenneth (February 13, 2007). "Researcher Cleared of Misconduct, but Case Is Still Murky". New York Times (Late Edition (Final) ed.). p. F–4. Retrieved 2007-05-13.
- "Miller Seeks Data on Purdue Investigation Into Scientific Misconduct". House Committee on Science and Technology. 22 March 2007. Retrieved 2007-05-13.
- Service, Robert F. (May 18, 2007), "Sonofusion back on the firing line as misconduct probe reopens.(Research Integrity)", Science 316 (5827): 964, doi:10.1126/science.316.5827.964 (registration required)
- Taleyarkhan, R.P.; Lapinskas, J; Xu, Y; Cho, J; Block, R; Laheyjr, R; Nigmatulin, R (June 2008). "Modeling, Analysis and Prediction of Neutron Emission Spectra From Acoustic Cavitation Bubble Fusion Experiments". Nuclear Engineering and Design 2008 (238): 2779–2791. doi:10.1016/j.nucengdes.2008.06.007.
- "Purdue committee completes research misconduct investigation". Purdue University. 18 July 2008. Retrieved 2008-07-18.
- Jayaraman, K. S. (2008). "Bubble fusion discoverer says his science is vindicated". Nature India. doi:10.1038/nindia.2008.271.
- Purdue physicist found guilty of misconduct, Los Angeles Times, July 19, 2008, Thomas H. Maugh II
- Press, Associated (August 27, 2008). "Purdue reprimands fusion scientist for misconduct". USA Today. Retrieved 2010-12-28.
- Seife, Charles (November 2009). "Bubble Trouble". Sun in a Bottle: The Strange History of Fusion and the Science of Wishful Thinking. Penguin. pp. 171–200. ISBN 978-0-14-311634-9. Retrieved 24 September 2011.
- "Bubble Fusion Research Under Scrutiny", IEEE Spectrum, May 2006
- Peplow, M.A.R.K. (January 10, 2006). "Desktop fusion is back on the table; Physicist claims to have definitive data, but can they be replicated?". Nature News. doi:10.1038/news060109-5.
- "Sonofusion Experiment Produces Results Without External Neutron Source" PhysOrg.com January 27, 2006
- "Bubble fusion: silencing the hype", Nature online, March 8, 2006 — Nature reveals serious doubts over reports of fusion in collapsing bubbles (subscription required)
- "Fusion controversy rekindled" BBC News, March 5, 2002
- "Fusion experiment disappoints" BBC News, July 2, 2002
- What's New, March 10, 2006 - failed replications
- "Purdue Bubble Wraps Sonofusion Inquiry Results", June 21, 2006 Photonics.comdead link
- "Practical Fusion, or Just a Bubble?", Kenneth Chang, The New York Times, February 27, 2007