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# 物質厚さの考察（手始め） - PowerPoint PPT Presentation

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• 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

• 陽電子の運動量(10-250MeV/cの領域)に大きく依存。

• ラフな手計算とGEANT4が一致

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

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

Multiple scattering through Aluminum

GEANT4

GEANT4

X0 = 24.01 [g/cm2]/ 2.699 [g/cm3]

x =1, p=200

 consistent with GEANT4

Multiple scattering through Polycarbonate