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单词 eta-c meson
释义
e·ta-c meson (ātə-sē, ētə-)
n.
An electrically neutral meson composed of a charm quark and a charm antiquark and having a mass 5,832 times that of the electron and a mean lifetime of about 2.6 × 10-23 second.
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更新时间:2025/3/22 11:19:59