物質厚さの考察(手始め)
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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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4233773
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


Energy loss through aluminum
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


Energy loss through polycarbonate lexan
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


Multiple scattering through aluminum
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


Multiple scattering through polycarbonate
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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