It should include the 1935 Beth experiment. A detailed account of photon spin is missing.Depends, though someone might write something I like. Moreover, it doesn't pertain intrinsically to photons, although this is debatable. Do we need more on the interactions of photons with matter? It's dangerous because it's a huge field and the article is already long.Later, when the gamma rays were discovered to be the same as X-rays and light, that is, electromagnetic, the name propagated to all EM "rays". I don't have a ref handy, but I'm pretty sure it derives from the early days of radioactivity, when the three differently-behaving rays were named alpha, beta, and gamma. A reference for how the photon came to be symbolized by γ, or a link to a scientific nomenclature committee that has established it so.
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