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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 by the following approximate relation: , where is the atomic number.〔(Molière Radius )〕 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).〔Phillip R. Sloan, Brandon Fogel, "Creating a Physical Biology: The Three-Man Paper and Early Molecular Biology" University of Chicago Press, 2011〕 ==Molière radii for typical materials used in calorimetry== * Caesium iodide: 3.8 cm * Liquid argon: 10.1 cm * Liquid krypton: 4.7 cm〔http://cds.cern.ch/record/256569/files/P00019924.pdf〕 * Lead tungstate crystals: 2.2 cm 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Molière radius」の詳細全文を読む スポンサード リンク
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