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electron capture

noun (physics)
1.
the transformation of an atomic nucleus in which an electron from the atom is spontaneously absorbed into the nucleus. A proton is changed into a neutron, thereby reducing the atomic number by 1. A neutrino is emitted. The process may be detected by the consequent emission of the characteristic X-rays of the resultant element Former name K-capture
2.
the spontaneous or induced recombination of free electrons with ions or by transfer from other atoms or ions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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