Positron decay
Positron emission or beta plus decay (β+ decay) is a particular type of radioactive decay and a subtype of beta decay, in which a proton inside a radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino (νe). Positron emission is mediated by the weak force. The positron is a type of beta particle (β+), the other beta particle being the electron (β-) emitted from the β- decay of a nucleus.
An example of positron emission (β+ decay) is shown with magnesium-23 decaying into sodium-23:
23
12Mg → 23
11Na + e+ + ν
e
Because positron emission decreases proton number relative to neutron number, positron decay happens typically in large "proton-rich" radionuclides. Positron decay results in nuclear transmutation, changing an atom of a chemical element into an atom of an element with an atomic number that is less by one unit.
Positron emission should not be confused with electron emission or beta minus decay (β- decay), which occurs when a neutron turns into a proton and the nucleus emits an electron and an antineutrino. Electron capture (sometimes called inverse beta decay) is also occasionally classified as a type of beta decay. (In some ways, electron capture can be regarded as the "opposite" of positron emission. It can only occur when electrons are available and requires less energy difference between parent and daughter, so occurs much more often in smaller atoms than positron emission does.)

This is an excerpt from the article Positron decay from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article Positron decay at en.wikipedia.org was accessed 107 times in the last 30 days. (as of: 07/09/2013)
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ChemTeam: Writing Positron and Electron Capture Equations
Positron decay is like a mirror image of beta decay. These points present a simplified view of what Positron decay actually is: 1) Something inside the nucleus of ...
www.chemteam.info/Radioactivity/Writing-Positron-EC.html
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Radioactivity
Electron and Antineutrino. Early studies of beta decay revealed a continuous energy spectrum up to a maximum, unlike the predictable energy of alpha particles.
hyperphysics.phy-astr.gsu.edu/hbase/nuclear/beta.html
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Radioactive Decay
A third form of beta decay is called positron ( sup>+) emission. The positron is the antimatter equivalent of an electron. It has the same mass as an electron, but ...
chemed.chem.purdue.edu/genchem/topicreview/bp/ch23/modes.php
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Positron emission - Wikipedia, the free encyclopedia
Positron emission or beta plus decay is a particular type of radioactive decay and a subtype of beta decay, in which a proton inside a radionuclide nucleus is ...
en.wikipedia.org/wiki/Positron_emission
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The Three Types of Radioactive Decay - Library
tritium decay. Alpha Decay of Hydrogen-3 to Helium-3. Adapted from Stability of Nuclei. There is also positron emission when the neutron to proton ratio is too ...
library.thinkquest.org/3471/radiation_types_body.html
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Decay Pathways - ChemWiki
Nuclides that are imbalanced in their ratio of protons to neutrons undergo decay to correct the imbalance. Nuclei that are rich ...
chemwiki.ucdavis.edu/Physical_Chemistry/Nuclear_Chemistry/Radioactivity/Decay_Pathways
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Other Modes of Radioactive Decay | Radiation Protection | US EPA
This page describes lesser-known mechanisms of radioactive decay.
www.epa.gov/radiation/understand/positron.html
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Types of Decay | Radioactive decay | Khan Academy
And actually I should write that here in; both of these reactions. So this is the positron emission, and I'm left over; with one positron. And in our beta decay, I'm left ...
www.khanacademy.org/science/chemistry/radioactive-decay/v/types-of-decay
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Positron Decay - YouTube
Need help? Ask me your questions here: http://vespr.org/videos/5130b7d19d534... This is also known as positron emission or beta plus decay, and it is ...
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Positron emission tomography - Wikipedia,…
Positron emission tomography (PET) is a nuclear medical imaging technique that produces a three-dimensional image or picture of functional processes in the body. The ...
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Positron decay in science
Positrons, Alpha Particles, and Gamma Rays
Good. The applet will show you many other decays that produce either electrons or positrons; it's easy to tell which, by the "direction" in which the decay moves.
Radioactive Decay
A third form of beta decay is called positron ( sup>+) emission. The positron is the antimatter equivalent of an electron. It has the same mass as an electron, but ...
Positron emission - Wikipedia, the free encyclopedia
Positron emission or beta plus decay is a particular type of radioactive decay and a subtype of beta decay, in which a proton inside a radionuclide nucleus is ...
Beta Radioactivity
The emission of the electron's antiparticle, the positron, is also called beta decay. Beta decay can be seen as the decay of one of the neutrons to a proton via the ...
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This decomposition of the nucleus is referred to as radioactive decay. ... decay process can produce particles as in the case of alpha, beta, or positron emission.
Internal Bremsstrahlung Accompanying the Positron Decay of 82Rb ...
Cutting edge, world leading, research is carried out in a wide range of subjects including medicine,nano technology, synchrotron radiation, geo sciences and ...
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process of positive electron (positron) emission in radioactive decay, only two years after the positron had been discovered in cosmic rays. These three nuclear.
Neutrinoless double-positron decay and positron-emitting electron ...
May 7, 2013 ... Neutrinoless double-Positron decay and positron-emitting electron ... for Theoretical Physics, Sloane Physics Laboratory, Yale University, New ...
Decay of chlorine 32 by positron emission - 1256 free PDF eBooks
Download decay of chlorine 32 by positron emission eBooks for ...
[PDF]Lifetime of the Superallowed Positron Decay of O
Lifetime of the. Superallowed Positron. Decay of. 14. O. P. H. Barker,. University of Auckland,. New Zealand and. A. D. Byrne,. Australian National University,.
Books on the term Positron decay
Positron Emission Tomography: Basic Sciences
Positron Emission Tomography: Basic Sciences
Dale L. Bailey, 2005
Positron decay There are two methods of production of positrons: by pair production, and by nuclear transmutation. Pair production will be discussed in the following section. Positron emission from the nucleus is secondary to the conversion of ...
Clinical PET and PET/CT
Clinical PET and PET/CT
H. Jadvar, J.A. Parker, 2005
Positron decay Radioisotopes that have an excess of protons may decay by electron capture or Positron decay. During electron capture, one of the orbital electrons — usually a k-shell electron — is captured by the nucleus and a proton is ...
Emission Tomography: The Fundamentals of PET and SPECT
Emission Tomography: The Fundamentals of PET and SPECT
Miles N. Wernick, John N. Aarsvold, 2004
In principle, decay by electron emission can originate from within the nucleus or for a free, unbound neutron. However, because the mass of the neutron (939 MeV/c2) is slightly larger than that of the proton (938 MeV/c2), decay by positron  ...
Positron Emission Tomography: Basic Sciences
Positron Emission Tomography: Basic Sciences
Peter E. Valk, 2003
Positron decay There are two methods of production of positrons: by pair production, and by nuclear transmutation. Pair production will be discussed in the following section. Positron emission from the nucleus is secondary to the conversion of ...
Chemistry and Physics for Nurse Anesthesia, Second Edition: A ...
Chemistry and Physics for Nurse Anesthesia, Second Edition: A ...
David Shubert, PhD, John Leyba, PhD, 2013
Positron decay Some nuclei have too many protons and thus Positron decay becomes energetically favorable. For smaller radionuclides, the repulsion between the positively charged protons makes the nucleus unstable, but the strong ...
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Positron decay
13.2 Nuclear energy levels and positron decay
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Physics - Positrons Galore
The first results from the space-borne Alpha Magnetic Spectrometer confirm an unexplained excess of high-energy positrons in Earth-bound cosmic rays.
physics.aps.org/articles/v6/40
FERMI supports decaying dark matter — The Edge of Physics Blog
edgeofphysics.com/blog/fermi-supports-decaying-dark-matter
» Dynamical Dark Matter and the Positron Excess in Light of AMS
arxiv:1306. 2959PDF Keith R.
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Alpha particles ionise when passing through matter and thus lose energy in many steps until their energy is almost zero. The distance...
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Positron Decay / Pozitron Çürüme « Kobus Nel's Web Blog
About life and everything
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Dispatches From Turtle Island: Positrons In The Sky. Why?
Astronomers have long known that the Earth and everything in its vicinity are constantly bombarded with "cosmic rays" a rather misleading term that includes highly energetic particles such as electrons and positrons (the anti-matter equivalent of electrons) as well. The Alpha Magnetic Spectrometer (AMS-02) experiment, on the International Space Station, has been carefully measuring this bombardment of electrons and positrons before they hit the atmosphere, leading to complicated by interactions with the gases in it.
dispatchesfromturtleisland.blogspot.com/2013/04/positrons-in-sky-why.html
Positron decay, page 1
www.abovetopsecret.com/forum/thread229170/pg
Decaying Dark Matter
honorsfellows.blogs.wm.edu/2011/06/12/decaying-dark-matter/
Beta decay - New World Encyclopedia
www.newworldencyclopedia.org/entry/Beta_decay
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