[NOTE: I changed the Subject line, but this msg was sparked by Lou Pagnucco's posting Thursday, July 05, 2012 11:06 AM]
Well, from a qualitative reading of the paper referred to in Lou's posting, it would appear that the scattering cross section http://en.wikipedia.org/wiki/Thomson_cross_section can be 'altered substantially' by a 'rather weak, low frequency field'. (the 'low-frequency field' in this work is from a laser, so I wouldn't exactly call that low-frequency; unless they are referring to the repetition rate and not the frequency of the laser light itself) Don't know if this effect on the scattering cross section applies to LENR, however, I think it supports the argument that *cross sections can be modified by very simple and low-power means*. When one reads this paper and Hagelstein's latest, I have to wonder if the RF generator is serving a similar purpose; namely, to modify the 'normal' cross-sections and/or branching ratios! And, perhaps that is why the resistive heater needed to be maintained at some level... i.e., after LENR ignition started, and the heater power was reduced to a much lower level, it wasn't the heat from the heater that was important, but the low frequency pulsing of an E-or-B field which served to alter branching ratios... remember that PWM was being used to set power level to the heater. There was also much discussion on this forum right after Rossi's first demo as to whether his setup was using a return path thru the reactor so the Ni powder was being affected by a pulsing E-field. -Mark -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Thursday, July 05, 2012 11:06 AM To: [email protected] Subject: Re: [Vo]:general approximation of the viability of gamma quenching Eric, It appears that the photon-stopping power of electrons which are "dressed" in electromagnetic fields may be much greater than that of bare electrons - i.e., "dressed" electrons that are exchanging large numbers of virtual photons with nearby nuclei and other electrons in magnetic and coulomb interactions. See: "[1]On Compton scattering of energetic photons by light atoms in the presence of a low-frequency electromagnetic field" <http://pubman.mpdl.mpg.de/pubman/item/escidoc:919561:1/component/escidoc:91 9560/COMPT777.pdf> http://pubman.mpdl.mpg.de/pubman/item/escidoc:919561:1/component/escidoc:919 560/COMPT777.pdf The gist of the paper is stated on page 3: "...that spectra of both emitted electrons and scattered photons can be remarkably modified by the interaction with a weak low-frequency laser field." Perhaps even greater effects occur in intense e-m fields generated in carbon and metal nanostructures. However, since gammas would not even be generated in some proposed LENR theories (e.g., neutron capture), this may be moot. I have some more data, but not enough time to post it right now. -- Lou Pagnucco
