R Process Nucleosynthesis

Chemistry
Tutor: None Selected Time limit: 1 Day

in R process nucleosynthesis how does Pb (206) transform into Bi(209)?

Jul 6th, 2015

Thank you for the opportunity to help you with your question! the solution is as such:

.

The r-process is a nucleosynthesis process that occurs in core-collapse supernovae and is responsible for the creation of approximately half of the neutron-rich heavier than iron. The process entails a succession of rapid neutron captures (hence the name r-process) by heavy seed nuclei, typically 56Fe or other more neutron-rich heavy isotopes.

206Pb then captures three neutrons, producing 209Pb, which decays to 209Bi by β decay, restarting the cycle:

206
82Pb
 
n  →  209
82Pb
209
82Pb
 
    →  209
83Bi
 
 e   ν
e

The net result of this cycle therefore is that 4 neutrons are converted into one alpha particle, two electrons, two anti-electron neutrinos and gamma radiation:

    n  →  4
2He
 
e  ν
e
 
γ

The process thus terminates in bismuth, the heaviest "stable" element, and polonium, the first non-primordial element after bismuth. (Bismuth is actually slightly radioactive, but with a half-life so long—a billion times the present age of the universe—that it is effectively stable over the lifetime of any existing star.)


references: https://en.wikipedia.org/wiki/S-process

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Jul 6th, 2015
reacn.docx

here it is.

Jul 6th, 2015

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