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Topic: Electron capture


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In the News (Mon 17 Dec 18)

  
  Nuclear Science Glossary
Nuclear decay by emission of an electron or a positron.
Disappearance of a radioactive substance due to nuclear emission of an alpha or beta particle, capture of an atomic electron, neutrinos, spontaneous fission, and the emission of bremsstrahlung, x-rays, and conversion electrons.
Nuclear decay by capture of an atomic electron.
ie.lbl.gov /education/glossary/Glossary.htm   (1718 words)

  
  Electron capture
The nucleus of an atom captures an electron of the atomic shell, whereby a proton in the nucleus converts into a neutron.
The formed nuclide has an atomic number which is smaller by one unit; the mass number remains the same.
Electron capture; capture of an electron from the nuclear shell of the electron sheath during the disintegration of potassium-40 into argon-40
www.euronuclear.org /info/encyclopedia/e/electroncapture.htm   (95 words)

  
  Electron capture - Wikipedia, the free encyclopedia
Electron capture is a decay mode for isotopes that will occur when there are too many protons in the nucleus of an atom, and there isn't enough energy to emit a positron; however, it continues to be a viable decay mode for radioactive isotopes that can decay by positron emission.
In this case, one of the orbital electrons, usually from the K or L electron shell (K-electron capture, also K-capture, or L-electron capture, L-capture), is captured by a proton in the nucleus, forming a neutron and a neutrino.
The electron in an outer shell fall in to the inner shell releacing energy, emitted as the x-ray.
en.wikipedia.org /wiki/Electron_capture   (364 words)

  
 Double electron capture - Wikipedia, the free encyclopedia
Double electron capture is a decay mode of atomic nucleus.
In this mode of decay, two of the orbital electrons are captured by two protons in the nucleus, forming two neutrons.
If the mass difference between the mother and daughter atoms is more than two masses of electron (1.022 MeV), the energy released in the process is enough to allow another mode of decay: electron capture with positron emission.
en.wikipedia.org /wiki/Double_electron_capture   (481 words)

  
 Glossary Item - Electron Capture
Electron capture is one process that unstable atoms can use to become more stable.
During electron capture, an electron in an atom's inner shell is drawn into the nucleus where it combines with a proton, forming a neutron and a neutrino.
For example, after undergoing electron capture, an atom of carbon (with 6 protons) becomes an atom of boron (with 5 protons).
education.jlab.org /glossary/electroncapture.html   (128 words)

  
 electron capture   (Site not responding. Last check: )
A contour plot of the time-dependent electron density for a hydrogen atom (the target nucleus is shown as a blue solid circle) disturbed by a charged particle (red solid circle with arrow) is displayed.
The proton enables electron-capture in the outgoing path of the collision and a large fraction of the electron density is finally bound to and moving with the projectile.
It is clearly visible that the electron density lies behind the projectile in this case, although the proton is attracting the electron.
www.hmi.de /people/schiwietz/cap.html   (510 words)

  
 Un Electron Libre...
La quasi-totalité des utilisateurs ne se pose même pas la question et se contente de profiter des services offerts, imaginant que Facebook offre son service gracieusement et de façon désintéressée.
Pourtant, faut vraiment être naif pour ne pas se rendre compte que le seul business model des services web 2.0 tient à la capture d'un utilisateur et à leur capacité à en connaitre un maximum sur ce-dernier afin de pouvoir monayer cela auprès d'annonceurs et investisseurs potentiels.
Rien n'est gratuit en ce bas monde et encore moins sur le net.
www.unelectronlibre.info   (3184 words)

  
 Radioactivity
Internal conversion is the use of electromagnetic energy from the nucleus to expel an orbital electron from the atom.
It is also not the same as beta decay, since the emitted electron was previously one of the orbital electrons, whereas the electron in beta decay is produced by the decay of a neutron.
Electron emissions from the Hg-203 to Tl-203 decay, measured by A. Wapstra, et al., Physica 20, 169 (1954).
hyperphysics.phy-astr.gsu.edu /hbase/nuclear/radact2.html   (628 words)

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