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| reaction |
in physics, the atomic change that occurs when a nucleus is bombarded with a particle, photon, or other nucleus. [1/6 definitions] |
| spallation |
a nuclear reaction in which bombardment of atomic nuclei with a high-energy projectiles results in the ejection of subatomic particles. [1/2 definitions] |
| subatom |
a constituent of an atom; atomic particle. |
| test ban |
an agreement between nations that produce atomic bombs to refrain from nuclear testing, as in the earth's atmosphere. |
| transuranic |
having an atomic number higher than that of uranium. |
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