Assertion: cosmic ray's source | /r/CapableOf | produce cosmic rays
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text: Now we have identified at least one source that produces cosmic rays because it produces cosmic neutrinos,” says Francis Halzen, a UW-Madison professor of physics who serves as the principal investigator for the IceCube Neutrino Observatory.
text: Sources that produce cosmic rays will almost certainly produce gamma rays as well, as the cosmic ray particles interact with nuclei or electrons to produce photons or neutral pions which in turn decay to ultra-high-energy photons.