Molière radius
Script error: No such module "other uses". 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. Two Molière radii contain 95% of the shower's energy deposition. It is related to the radiation length X0Script error: No such module "Check for unknown parameters". by the approximate relation RM = 0.0265 X0 (Z + 1.2)Script error: No such module "Check for unknown parameters"., where ZScript error: No such module "Check for unknown parameters". is the atomic number.[1] 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 of 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
- LYSO crystals: 2.07 cm[3]
- Lead tungstate crystals: 2.2 cm[4]
- Caesium iodide: 3.5 cm[5]
- Liquid krypton: 4.7 cm[6]
- Liquid argon: 9.04 cm[7]
- Earth's atmosphere at sea level: 79 m[8]
- Earth's atmosphere above ground: 91 m[9]
References
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- ↑ Molière Radius Template:Webarchive
- ↑ Phillip R. Sloan, Brandon Fogel, "Creating a Physical Biology: The Three-Man Paper and Early Molecular Biology" University of Chicago Press, 2011
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- ↑ Atomic and nuclear properties of cesium iodide (CsI)
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- ↑ Atomic and nuclear properties of materials: Liquid argon (Ar) (Ar)
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