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物質厚さの考察（手始め）

物質厚さの考察（手始め）. エネルギー損失 物質の Stopping power, density, thickness に依る。 陽電子の運動量 (10-250MeV/ c の領域 ) に大きく依存しない。 大体、 5 MeV/cm (Al), 2.5MeV/cm (Polycarbonate) 多重 散乱 物質の Radiation length, density, thickness に依る。 陽電子の運動量 (10-250MeV/ c の領域 ) に大きく依存。

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物質厚さの考察（手始め）

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  1. 物質厚さの考察（手始め） • エネルギー損失 • 物質のStopping power, density, thicknessに依る。 • 陽電子の運動量(10-250MeV/cの領域)に大きく依存しない。 • 大体、5MeV/cm (Al), 2.5MeV/cm (Polycarbonate) • 多重散乱 • 物質のRadiation length, density, thicknessに依る。 • 陽電子の運動量(10-250MeV/cの領域)に大きく依存。 • 大体、200MeV/c 陽電子で 20mrad/cm (Al), 10mrad/cm (Polycarbonate) • ラフな手計算とGEANT4が一致

  2. Energy loss through Aluminum GEANT4 GEANT4 = 391 at 200MeV/c =97.8 at 10MeV/c  2MeV cm2/g (Particle data book の Stopping powerの図より) Al density = 2.699 g/cm3 Energy loss in Al 5.4 MeV/cm

  3. Energy loss through Polycarbonate (Lexan) Peak at 2MeV GEANT4 GEANT4 = 391 at 200MeV/c =97.8 at 10MeV/c  2MeV cm2/g (Particle data book の Stopping powerの図より) Lexan density = 1.20 g/cm3 Energy loss in Lexan2.4 MeV/cm

  4. Multiple scattering through Aluminum 20mrad GEANT4 GEANT4 X0 = 24.01 [g/cm2]/ 2.699 [g/cm3] x =1, p=200 0 = 20[mrad]  consistent with GEANT4

  5. Multiple scattering through Polycarbonate 10mrad GEANT4 GEANT4 X0 = 41.50 [g/cm2] / 1.2 [g/cm3] x =1, p=200 0 = 9.9[mrad]  Consistent with GEANT4

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