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Encyclopedia > Neutron capture

The process of neutron capture can proceed in two ways - as a rapid process (an r-process) or a slow process (an s-process). The R process (R for rapid) is a neutron capture process for radioactive elements which occurs in high neutron density, high temperature conditions. ... The S process (S for slow) is a neutron capture process in the decay of radioactive elements that occurs in lower neutron density, lower temperature conditions. ...


See also

  • p-process (proton capture)

  Results from FactBites:
 
CD016: U-Th-Pb and neutron capture. (669 words)
When neutron capture reactions are taken into account, the calculated age of the ores changes from approximately 600 million years to recent.
In one of his corrections for neutron capture, Cook (1966) calculated that an ore dated to 622 million years by conventional methods should be dated to 70 million years.
Cook (1966) calculated his correction factor based on the (explicitly stated) assumption that the "cross-section" (a measurement of the probability of a nuclear reaction happening) for conversion of lead-206 to lead-207 by neutron capture is the same as the cross-section for conversion of lead-207 to lead-208 by neutron capture.
Neutron radiation around nuclear reactors (1518 words)
Neutron capture in common materials (including your tissues) is most likely to occur with atoms of hydrogen, nitrogen, sodium, or sulfur.
Neutron capture by nitrogen-14 (the most abundant isotope in atmospheric nitrogen) creates carbon-14, which is radioactive and decays slowly (half-life of 5,700 years) with the emission of a beta particle.
Neutron capture is also accompanied by the prompt emission of either a gamma photon or a charged particle.
  More results at FactBites »


 

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