The resulting daughter nuclide, if it is in an excited state, then transitions to its ground state. Similarly, the momentum of the neutrino emission causes the daughter atom to recoil with a single characteristic momentum. Since this single emitted neutrino carries the entire decay energy, it has this single characteristic energy. This process thereby changes a nuclear proton to a neutron and simultaneously causes the emission of an electron neutrino.Į or when written as a nuclear reaction equation, e − 1 0 + p 1 1 ⟶ n 0 1 + 0 0 The outer electron is ejected from the atom, leaving a positive ion.Įlectron capture ( K-electron capture, also K-capture, or L-electron capture, L-capture) is a process in which the proton-rich nucleus of an electrically neutral atom absorbs an inner atomic electron, usually from the K or L electron shells. Lower right: In the Auger effect, the energy absorbed when the outer electron replaces the inner electron is transferred to an outer electron. An x-ray, equal in energy to the difference between the two electron shells, is emitted. Lower left: An outer electron replaces the "missing" electron. For the detector used in gas chromatography, see Electron-capture dissociation. For the fragmentation method used in mass spectrometry, see Electron capture ionization. This article is about the radioactive decay mode.
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