The horse will never drink muddy water, and muddy thinking will not suffice in science.
The explanation offered violates conservation of momentum and is obviously false. The paper cited does not mention gammas, requires cryogenic temperatures near absolute zero, and in point of fact - the effect would be complexly destroyed by gamma radiation and has no applicability to gamma shielding. End of story. From: Axil Axil For all those who are interested in how gamma radiation is thermalized in hundreds of millions of microvolt thermal quanta, here is a quantum mechanical paper which contains a lot of words describing how the conditions for thermalization occurs out of the blue. This finding is consistent with the long sought after physical manifestation of the model called the 'Spin-Boson Model' required to thermalize gammas. My good fellows, when the answer is handed to you on a plate, look into it! But unfortunately we all know "You can take a horse to water but you can't make him drink." Coherent Oscillations in an Exciton-Polariton Josephson Junction arxiv.org/pdf/1004.2216 Cheers: Axil