electron capture

World English Dictionary
electron capture
 
n
1.  Former name: K-capture 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
2.  the spontaneous or induced recombination of free electrons with ions or by transfer from other atoms or ions

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