A. Widom and L. Larsen, "Absorption of Nuclear Gamma Radiation by Heavy Electrons on Metallic Hydride Surfaces," preprint (September 10, 2005), available at http://newenergytimes.com/v2/library/2006/2006Widom-AbsorptionOfNuclearGamma.pdf.
Widom and Larsen seek to provide an explanation for the lack of hard gamma photons observed in LENR experiments. They assume that hard photons are a necessary result of the reactions. They look at the mean free path of the gamma photons and conclude that they are absorbed by the heavy electrons near the surface produced as a result of upward mass renormalization. After a heavy electron has absorbed a hard photon, a large number of soft photons are emitted in the x-ray and infrared wavelengths.