Lesson plan
Rp-process
The rp-process (rapid proton capture process) consists of consecutive proton captures onto seed nuclei to produce heavier elements. It is a nucleosynthesis process and, along with the s-process and the r-process, may be responsible for the generation of many of the heavy elements present in the universe. However, it is notably different from the other processes mentioned in that it occurs on the proton-rich side of stability as opposed to on the neutron-rich side of stability. The end point of the rp-process (the highest-mass element it can create) is not yet well established, but research shows that in neutron stars it will not progress beyond tellurium. The definitive endpoint is reached at 107 Te because of instability toward alpha decay, and primarily photon-induced decay or (γ,α) reactions loop the path back onto itself. Therefore, an rp-process would only be able to produce nuclei with mass numbers up to 106 or 107. After this, further proton captures result in prompt proton emission or alpha emission, and thus the proton flux is consumed without yielding heavier elements; this end process is known as the tin–antimony–tellurium cycle, which that more recent source claims is not actually reached.
Article summary
The rp-process (rapid proton capture process) consists of consecutive proton captures onto seed nuclei to produce heavier elements. It is a nucleosynthesis process and, along with the s-process and the r-process, may be responsible for the generation of many of the heavy elements present in the universe. However, it is notably different from the other processes mentioned in that it occurs on the proton-rich side of stability as opposed to on the neutron-rich side of stability. The end point of the rp-process (the highest-mass element it can create) is not yet well established, but research shows that in neutron stars it will not progress beyond tellurium. The definitive endpoint is reached at 107 Te because of instability toward alpha decay, and primarily photon-induced decay or (γ,α) reactions loop the path back onto itself. Therefore, an rp-process would only be able to produce nuclei with mass numbers up to 106 or 107. After this, further proton captures result in prompt proton emission or alpha emission, and thus the proton flux is consumed without yielding heavier elements; this end process is known as the tin–antimony–tellurium cycle, which that more recent source claims is not actually reached.
Key claims
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.