On Sun, Jul 7, 2013 at 6:08 PM, H Veeder <hveeder...@gmail.com> wrote:
> Which paper describes the use of 300 eV? > I was recalling things from memory and appear to have gotten a few details mixed up. Thankfully, not the most important one about the energy of the beam. The paper is [1], below, by G.P. Chambers and others (it does not appear to be available online). The substrate was titanium rather than palladium, as I had said. The energy of the deuteron beam was 350-1000 eV. They saw ~5 MeV particles exiting from the *backside* (rather than the front side) of a 1 um thick deuterated titanium foil, as detected in a silicon surface-barrier detector positioned behind it. They saw such events only in live runs and not in control runs. The rate of events was 10^(-16) per deuteron pair per second, which they calculated to be 26 orders of magnitude higher than the conventional cross sections. Another detail I might have mixed up concerned the dd branches. The usual dd branches would involve neutrons (2.45 MeV), in one branch, and energetic tritons (1 MeV) and protons (3 MeV), in the other (the tritons might be within the region of noise for a silicon surface barrier, but not the protons). In this case they saw a peak at ~2.5 MeV that might be attributable to the protons, accounting for energy loss (although I don't think they offered this interpretation). But they also saw the peak at ~5 MeV which they were unable to explain. It could have been pileup from more than one particle arriving at the detector in an interval shorter than its time resolution. Another thing they had yet to rule out at the time of writing was a radioactive impurity causing the peak. But they saw it only in live runs and not in control runs, so there is evidence against this. It's a mistake to base much off of a single paper, but this paper is interesting, nonetheless. There are many interesting details hidden in the ion beam experiments. Eric [1] http://proceedings.aip.org/resource/2/apcpcs/228/1/383_1?isAuthorized=no
