Talk:Molière radius

I'd like to see this article list the Moliere radius for the electromagnetic calorimeters on ATLAS and CMS and other leading particle calorimeters. I know the CMS uses lead-tungsten crystals in its calorimeter. Pulu (talk) 00:47, 8 September 2009 (UTC)

It would also be interesting to see the value for air etc. since it is interesting for all air shower detectors.14:29, 24 December 2009 (UTC) —Preceding unsigned comment added by 80.137.106.54 (talk)

Outdated approximation for Ec
Please read the current Review of Particle Physics (RPP) before inserting a formula from the one decade old Particle BriefBook. This 0.0265 (from the BriefBook) implying Ec ≈ 800 MeV/(Z + 1.2) is coming from the old Berger & Seltzer fit. The current Review of Particle Physics (section 27.4.3) states:


 * [...] Berger and Seltzer [46] also give the approximation Ec = (800 MeV)/(Z + 1.2). This formula has been widely quoted, and has been given in older editions of this Review [47]. Among alternate definitions is that of Rossi [2], [...] This form has been found to describe transverse electromagnetic shower development more accurately (see below). [...]


 * The accuracy of approximate forms for Ec has been limited by the failure to distinguish between gases and solid or liquids, where there is a substantial difference in ionization at the relevant energy because of the density effect. [...]

[47] is the ancient RPP from 1992, by the way. The proper relation is that RM = X0 Es/Ec, where Ec is a material constant, and for which a separate gas-liquid/solid fit should be used (given in the Review of Particle Physics), and not the one from Berger & Seltzer. — Ylai (talk) 02:22, 8 May 2011 (UTC)

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