Talk:Supernova nucleosynthesis

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Supernova/Supernovae?[edit]

Is it supernova or supernovae? Or is that just a difference between the crazy british and american spellings of color and colour.

  • The word nova in this case comes from the Latin word for 'new', as it was originally applied to nova which were originally thought to be new stars. So, like many Latin words, nova is singular and novae is plural. So, it ought be supernova nucleosynthesis just like it is stellar nucleosynthesis where the adjective is singular. DAID 04:56, 19 July 2007 (UTC)

Review needed[edit]

This article really needs a going-over by someone with some expertise in this field. I edited it a bit to remove some obvious factual errors, but I think it has bigger problems. I haven't studied this stuff in years, though, so perhaps my memory is incorrect.--Srleffler 05:43, 27 April 2006 (UTC)

  • Looked at this article for factual accuracy (I have some amount of expertise in the field). There were some factual errors which I've now corrected. As far as I'm aware it's now accurate. [By the way, the s process does occur in stellar nucleosynthesis. It doesn't occur in supernova nucleosynthesis. I've changed the article to reflect this.] James E B 10:14, 27 April 2006 (UTC)
  • I think that perhaps this article ought be merged with the r-process article, as both are somewhat lacking. Furthermore, the nucleosynthesis page suggests supernova nucleosynthesis is one of four types, and different from [[stellar nucleosynthesis]. Usually this is not the case, and explosive stellar nucleosynthesis is part of stellar nucleosynthesis making 3 main branches of nucleosynthesis. I will make comment on that page to this effect. I also have some expertise in the field of nuclear astrophysics, but I have yet to do excessive research about supernovae. DAID 05:00, 19 July 2007 (UTC)
Still no remarks on this. I will plan to delete this article, merge it with the r-process page, and put a redirect link. Although supernovae are a very likely environment the r-process can occur, the explosion mechanism is not clear, and the location of the r-process within a supernova, and the environment, is totally unknown. DAID (talk) 06:53, 7 April 2010 (UTC)
Sorry, what I mean is that the r-process components should be entirely moved to the r-process page, and that discussion should be very limited here. For Type Ia supernovae, the nucleosynthesis is well understood and established, and this process of nucleosynthesis is the one referred to as supernova nucleosynthesis. No one is calling the r-process by that name, however.DAID (talk) 06:58, 7 April 2010 (UTC)

Fusion versus nucleosynthesis[edit]

While reading the Supernova article, I came across this sentence: "These elements are produced by fusion (for iron and lighter elements), and by nucleosynthesis during the supernova explosion for elements heavier than iron." This led me the conclusion that nucleosynthesis is a distinctly different process from fusion, and so I followed the link to this article. After reading this article, I started thinking that nucleosynthesis is really a type of fusion... but I still wasn't sure. So I then went to the Nuclear fusion article and found the following: "Nuclear fusion of heavy elements (absorbing energy) occurs in the extremely high-energy conditions of supernova explosions." Couldn't a statement be added in the opening paragraph of this article that clearly states that nucleosynthesis is a type of nuclear fusion to prevent others from having the same confusion? Enduser 16:39, 30 June 2006 (UTC)

The word fusion has since been added to the opening, but to be clear, nucleosynthesis is exactly what the word sounds like: creation of nuclei. This does not need to be done through fusion, but it can be done through fusion. Fusion is a nuclear reaction mechanism, and nucleosynthesis is the concept of creating nuclei from any of many nuclear reactions.DAID (talk) 06:56, 7 April 2010 (UTC)
Fusion is generally regarded as a nuclear reaction producing nuclei that are larger (higher N) than the original nuclei and that produces energy. Therefore a neutron capture by lead is not a fusion reaction, since it doesn't produce energy, it just absorbs the neutron and its kinetic energy. Rursus dixit. (mbork3!) 12:48, 30 November 2010 (UTC)

Isotope / isobar[edit]

The r-process section included the line - "decays until the first stable isobar is reached." I changed isobar to isotope, since it is really the stability of the individual isotope that matters. However, in the r-process, the decay is apparently purely by beta emission, thus increasing the proton number along an isobaric line. It is consequently reasonable in this context to speak of a stable isobar. However, to avoid confusion, I think it is better to leave it as isotope, or go into a little more detail about the process to show why the word isobar is applicable in this context. --King Hildebrand 09:46, 6 August 2007 (UTC)

  • I agree that detail about the decay back to stability along a constant A line (isobaric line) would be an improvement. In particular, it's important for us to make a distinction in the article how when the r-process nuclei decay back to stability, they populate peaks that are shifted from the s-process peaks for this reason, even though both the s-process and r-process produce peaks at magic number nuclei. Future editing and additions to this effect are warranted, and I will try to look at the article later this week, and also welcome such contributions from other. DAID 04:15, 12 August 2007 (UTC)

WikiProject class rating[edit]

This article was automatically assessed because at least one WikiProject had rated the article as start, and the rating on other projects was brought up to start class. BetacommandBot 10:04, 10 November 2007 (UTC)

Disbelief: Cf[edit]

Disbelief that Cf have ever been detected in supernovae, see Talk:Californium#Not_in_supernovae_.28I_presume.29. Rursus dixit. (mbork3!) 12:49, 30 November 2010 (UTC)