Inasmuch as the requirement for spontaneous radioactive decay is that the total mass on the parent side of the reaction must exceed the total mass on the daughter side (the mass ‘lost’ being converted into the decay energy), positron decay requires that the mass of the parent nucleus exceed that of the daughter nucleus by at. In positron decay, a proton in the nucleus is converted to a neutron and a positron, and the positron is ejected from the nucleus. Electron capture and positron decay thus represent alternative decay modes for a ‘proton-rich’ unstable nucleus. And example of this would be is Be-7 undergoes. The atomic number will decrease by one while the atomic weight does not change. This rare type of emission occurs when a proton is converted to a neutron and a positron in the nucleus, with ejection of the positron. This process will reduce the atomic number by one and not changed the atoms mass. A positron is a positive electron (a form of antimatter). Both electron capture and positron emission, on the other hand, result in a decrease in the atomic number of the nucleus. Electron emission therefore leads to an increase in the atomic number of the nucleus. It can capture an electron or it can emit a positron. The result is that a proton will combine with this electron and a neutron is formed. A proton, on the other hand, could be transformed into a neutron by two pathways. The daughter nucleus may be in an excited state.Įlectron capture produces a daughter nucleus with atomic number one less than, but atomic mass number the same as, the parent nucleus. Electron capture occurs when an inner-orbital electron (negatively charged) is captured by the nucleus (positively charged). The electron reacts with one of the nuclear protons, forming a neutron and producing a neutrino. Electron capture is a mode of beta decay in which an electron commonly from an inner (low-energy) orbital is ‘captured’ by the atomic nucleus. Electron capture is a mode of beta decay in which an electron – commonly from an inner (low-energy) orbital – is ‘captured’ by the atomic nucleus.
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