Worth mentioning in the "mystery radiation" inquiry, is this old data which presents a possible connection of LENR to dark matter by way of the purported characteristic soft x-ray emission at 3.6 keV. The citation below is a high quality 25 year old paper from Mitsubishi written by Iwamura, presented at ICCF '96.
It can be found at the LENR-CANR library but has been largely overlooked, since it came out many years before the astrophysics of dark matter - which now purportedly link to a soft x-ray peak, found in hundreds of galaxies. At this time (early 1990s) Iwamura had no clue what they had found, and never got back to the same line of research despite mentioning that it was of high importance. The paper in question is: Iwamura, Y., et al. "Correlation between behavior of deuterium in palladium and occurrence of nuclear reactions"... Sixth International Conference on Cold Fusion,1996. http://www.lenr-canr.org/acrobat/IwamuraYcorrelatio.pdf The relevant data is easy to miss (I hope that I have not misinterpreted it). Please have a look at the second graph (Fig 4) on page 6 - the lower one which correlates the energy of the mystery radiation to the count rate over about one week of run time. As you can see, the low end of the energy scale is exponentially higher in counts, and the range seems to be highest at the detector threshold, so with more modern detection, one can imagine that it could even have been higher (due to the steepness of the line at cutoff). For instance,there appears to be about 1000 counts at 50 keV but 100,000 counts at the low end, which is arguably around the dark matter signature at 3.6 keV. In short, the range which has the highest count rate is consistent with dark energy photons but the authors did not recognize that, of course, and made no mention of what it could be except to note its importance. So essentially this partial finding which now looks important in retrospect, was not pursued. Fortunately, the data is here and stands on its own... at least in the imagination of LENR optimists. Jones (having survived recent California wild fires and electrical power disruption...)
