"Spin coupling" is a superset phrase for several types of energy transfer mechanisms, including angular momentum coupling, magnetic coupling and much more. Unfortunately, there is no scholarly paper to elucidate all of the intricacy of this phenomenon, as it applies to LENR. Mention was made of spin coupling in gravimagnetics by Horace Heffner years ago, and it is too bad he is not here to bring those comments up to date in a broader context. It was part of Julian Schwinger's approach to LENR, far earlier.
Spin coupling exists as a way to transfer energy across vast scales of geometry, all the way from galaxies down to quarks. Included in the term are 1) magnetic dipole coupling 2) LS coupling of hydrogen and possibly potassium, where the electron spins interact among themselves in groups to form a total spin angular momentum (similar to magnons); 3) J coupling, which is also called indirect dipole-dipole coupling which is mediated through hydrogen bonds connecting two spins. 4) JJ coupling happens between heavier atoms like nickel; 5) Spin-spin coupling 6) Magnon coupling 7) Mössbauer coupling 8) Nuclear coupling, which is stronger at short distances and is incorporated directly into the nuclear shell model. 9) Subatomic spin coupling of quarks and pions QCD etc. Certainly there are others under the umbrella of spin coupling. A focus on spin coupling phenomenon - as the main source of nuclear gain, without gamma radiation, is new to somewhat new to LENR and it is not clear who to attribute the idea to, possibly Schwinger in a simpler form - but it stands as an alternative way to transfer mass-energy from heavy nuclei, directly to light nuclei, then to electrons, then to magnons (in the sense of a coherent array). The energy is nuclear, but there is no fusion nor is it Mills, even if reduced orbitals are involved. The result is spatial thermal gain which is similar in some respects to the way a magnetic core of a transformer heats up. Yet in the end the gain is mass-to-energy - since nuclear mass converts to spin at a basic subatomic level, starting at the quark level and QCD. The main problem is that there could be much more going on in any LENR experiment than spin coupling. In fact, spin coupling can co-exist with nuclear fusion, beta decay, hydrinos or any other nuclear process. Plus, gain from spin coupling can make incidental fusion reactions seem more robust than they in actuality ... or vice-versa. By that, it is suggested that spin coupling, providing only milli-eV of energy per nucleon, but which is transferred at terahertz rates, is a mechanism which can provide many Watts of thermal gain, which can make a few incidental fusion reactions stand-out as being more important than they are... or vice versa. This is a complex and interesting angle - for looking at gain in nickel-hydrogen systems for several reasons. First, of course is that nickel is ferromagnetic and many experiments have shown changes around the Curie point of nickel. Second is the Letts/Cravens effect and the recent NI-Week demo of Dennis Cravens, and the magnetic work of Mitchell Swartz - all of which show a strong connection of magnetism to excess heat. Jones
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