A new story in Nature reiterates that an Indian-American nuclear scientist’s claims of tabletop fusion are suspect (thanks, Saheli):
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Dr. Rusi Taleyarkhan |
Several Purdue researchers said Rusi Taleyarkhan, a Purdue professor of nuclear engineering, has stymied their attempts to verify or refute aspects of his controversial “bubble fusion” experiments since late 2003, when he joined Purdue’s faculty. In an article published online Wednesday in the journal Nature, they said their confidence in his work at Purdue and previously at Oak Ridge National Laboratory in Tennessee has been seriously shaken…Seth Putterman, a professor of physics at the University of California, Los Angeles, who received a $350,000 grant from the Defense Department to try to reproduce Taleyarkhan’s findings, said he has been unable to do so. [Link]
In February 2005, the BBC commissioned a collaboration between Seth Putterman and Ken Suslick (two leading sonoluminescence researchers) 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. This work was reviewed by a team of four scientists, including an expert in sonoluminescence and an expert in neutron detection, who also concluded that no evidence of fusion could be observed. [Link]
Taleyarkhan’s paper had skeptics from the beginning — this excerpt is from 2002:
Continue readingHowever, many scientists remain sceptical of the results reported by Rusi Taleyarkhan and his colleagues at Oak Ridge National Laboratory in Tennessee, including other researchers at ORNL who tried and failed to repeat the experiments.
The second ORNL team say they used a more sophisticated detection system. But team member Mike Saltmarsh says: “Our experiment saw no evidence for nuclear fusion. This does not prove that no nuclear fusion is going on – it’s virtually impossible to prove a negative – but it does show that if it exists, it is at a very low level…” [Link]