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Talk:Klein–Nishina formula

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This is an old revision of this page, as edited by Spatrick99 (talk | contribs) at 21:31, 9 December 2010 (Units). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Good morning i'd like to know if someone here knows what's the Klein nishina effect??? because in all site i found "the famous KN effect" but noone told me what it is. The formula is wonderfull but i don't have time to study in detials this formula to found, or imagine, what could be this so famous effect. Please i need it quickly. send me a mail at giraudalexandre@homtmail.com if you can tell me what's this effect in few clearly and precisly words. :)

Thank you

Alex.

error in text

The text states that:

"The value dσ / dΩ is the probability that a photon will scatter into the solid angle defined by dΩ = 2πsinθdθ."

A differential cross section is not a probability. It is an effective area around a target particle that the scattered particle must enter in order to scatter into a given solid angle.

Wigcp 03:45, 25 July 2007 (UTC)[reply]

Units

I think the formula given is valid only in Lorentz-Heaviside units. It would have various factors of and floating around if it were written in SI or Gaussian units. I haven't made the changes myself as I'm not sure of my facts: I came to this article to find out for sure! Thanks. Matt (talk) 16:32, 4 January 2010 (UTC)[reply]

As written, it's correct: all the wierd unit conversion factors are burried inside the . The definition of the fine structure constant in terms of other constants depends on the unit system, but in any unit system it ends up as the unitless number about 1/137. Spatrick99 (talk) 21:31, 9 December 2010 (UTC)[reply]