The Mössbauer effect has been observed in Nickel-61. http://prola.aps.org/abstract/PR/v121/i5/p1344_1
Although this nickel isotope is not Rossi's chosen one for gain, there is a fair chance that treated nickel would be enriched in Ni-61 by the same process that Rossi uses to enrich in Ni-62. If true, the Ni-61 could operate as a resonant emitter of RF to possibly remove energy from the inner capsule. Curiously the resistance wire would then be appropriately placed to collect and recycle that RF in a positive feedback loop. There is relevance of the Mössbauer effect (ME) to anomalous photon emission, in general. The HotCat qualifies for anomalous IR emission, and the emission has not necessarily been tied to any process yet. Any further information can help to frame a more accurate understanding of the dynamics. The nickel isotopes in the Rossi HotCat would likely be sputtered on the inner wall of the tube - in essentially a 2D layer; and Ni-62 would provide excess energy in a higher spectrum, possibly a soft X-Rays. Unlike the ME effect in normal NMR techniques there is no external keV gamma source, but instead there is the internal source of radiation, possibly related to a Rydberg "hole" of nickel. The Mössbauer effect would be easy to spot in the HotCat, if it is there, so there is no reason to speculate. We can calculate the NMR frequency, and an applied magnetic field of .5 T should produce RF in the range of 2 MHz. If RF is seen when a magnetic field from an large NIB magnet is moved near the operating HotCat, or even if RF is seen at all - then this speculation is meaningful. If no RF is seen, then Mössbauer is probably not relevant. This assumes that the nickel is enriched not only in Ni-62 but also in Ni-61.
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