Molière radius
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The Molière radius is a characteristic constant of a material giving the scale of the transverse dimension of the fully contained electromagnetic showers initiated by an incident high energy electron or photon. By definition, it is the radius of a cylinder containing on average 90% of the shower's energy deposition. It is related to the radiation length X0 by the following approximate relation: RM = 0.0265 X0 (Z + 1.2), where Z is the atomic number.[1][dead link] The Molière radius is useful in experimental particle physics in the design of calorimeters: a smaller Molière radius means better shower position resolution, and better shower separation due to a smaller degree shower overlaps.
The Molière radius is named after German physicist Paul Friederich Gaspard Gert Molière (1909–64).[2]
Molière radii for typical materials used in calorimetry
- Caesium iodide: 3.8 cm
- Liquid argon: 10.1 cm
- Liquid krypton: 4.7 cm[3]
- Lead tungstate crystals: 2.2 cm[4]
References
- ↑ Molière Radius
- ↑ Phillip R. Sloan, Brandon Fogel, "Creating a Physical Biology: The Three-Man Paper and Early Molecular Biology" University of Chicago Press, 2011
- ↑ http://cds.cern.ch/record/256569/files/P00019924.pdf
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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