Talk:Neutron cross section
|WikiProject Physics||(Rated Start-class, Low-importance)|
very bad article
The definitions are unclear, the statements are misleading. I would remove the contents and redirect to a more general article, like nuclear data.
- Agree. Truly bad. I'm for removal. If there is anything useful in there, it should be transfered to the nuclear cross section stub.
- As wonderful and deep a topic neutron cross sections are (no joking), I have to agree here. The decay information does not belong on this page, and any mechanisms of specific behavior of the cross sections is better presented in the nuclear cross section article, critical mass article, etc. ... How do you move/merge/delete pages? THaskin (talk) 06:01, 20 August 2008 (UTC)
What is needed
- Agreed. A couple of sources are given at the end of the article, but there are better ones, especially for non-thermal neutrons. --JWB (talk) 21:14, 21 October 2009 (UTC)
Table of neutron cross sections
Hi, unfortunately I have had to remove the table of neutron cross-sections. This is because the source http://environmentalchemistry.com/yogi/periodic/crosssection.html clearly states that the information cannot be reproduced with the following notice: NOTICE: While linking to articles is encouraged, OUR ARTICLES MAY NOT BE COPIED TO OR REPUBLISHED ON ANOTHER WEBSITE UNDER ANY CIRCUMSTANCES.
I think it is very useful to provide a table of neutron scattering cross sections but obviously we cannot use this source because that would be a clear copyright violation. However, we could use a different source. Sears V.F. Neutron News 3 (1992) 26-37 for example is a commonly used reference in the neutron scattering community. It also provides error values on the scattering lengths / cross sections which the previous table did not. Polyamorph (talk) 19:49, 13 May 2010 (UTC)
preservation of momentum
Cross section absorbtion or scattering is the interaction of atomic nuclear wave function and wave function of neutron. Cross sections vary with fast neutrons and slow neutrons.
The successful fusion of one particle and another particle generates particles and radiation which preserves momentum and energy (although sometimes it remains in a higher energy metastable state). It is exceedingly rare for a reaction not to emit a particle in addition to the original target particle. Boron-10 absorbs a neutron (and its energy and momentum) and excess energy in the Boron-11 metastable state decays it into Lithium-7 and Alpha particle.
Most of this article is irrelevant to cross section, should go to nuclear decay.
In the stellar environment H+H=2He is reversible until it (very rarely) decays to Deuterium. Same with D+H=3He. These Solar reactions are very very very rare. The Sun however is very very very big.
Not mentioned that before star burns Helium, it enters carbon-cycle which is more efficient and burns Hydrogen one proton at a time.
I'm not familiar with the Janis software and after trying it out for a bit I'm lost on how to get the Scattering/Capture/Fission numbers. Could someone with practice please add data for fuel isotopes 232Th and 233U? -- Limulus (talk) 05:46, 22 December 2013 (UTC)
Remove "Common light element moderators, reflectors and absorbers.svg" picture
Remove "Common light element moderators, reflectors and absorbers.svg" picture for inaccuracy. Looks like its supposed to be two graphs but half the information is missing (Legend confusing). Shjacks45 (talk) 15:12, 9 January 2014 (UTC)