Nuclear reactors are best-known as power plants, generating electricity. However, they’re also important physics laboratories, producing exotic atomic nuclei and particles that are useful in other contexts. One byproduct is antineutrinos: the antimatter version of neutrinos, some of the most intriguing and difficult particles to study. For instance, though they are fundamental particles of nature, we don’t even know how massive they are — and mass is one of the most properties anything can have. Yet they’re some of the most numerous particles in the cosmos, and might help us understand why we’re here at all. These little particles are a huge deal, and finding their masses is part of getting answers to some big questions.

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