e·ta-c particle (ā'tə-sē', ē'tə-) n. An electrically neutral meson having a mass 5,832 times that of the electron and a mean lifetime of approximately 3.1 × 10-22 seconds. See Table at subatomic particle. |
| eta-c particle (ā'tə-sē', ē'tə-) Pronunciation Key
An electrically neutral meson having a mass 5,832 times that of the electron and a mean lifetime of approximately 3.1 × 10-22 seconds. See Table at subatomic particle. |