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Homework Help: Scattering alpha particles

  1. Jun 8, 2016 #1
    1. The problem statement, all variables and given/known data
    Onto an Aluminium 50μm thick plate, we send a beam of alpha particles with unknown kinetic energy. the cross section of the beam is 2cm2, density 1013 / scm2 . Whats the kinetic energy of the particles if every second we sense 105 scattered particles between the angles 40° and 41°? Take into count only the Coulumb interaction and the density of Aluminium is 1850 kg/m3

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jun 8, 2016 #2


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    Gold Member

    You have to show your attempt first! :)
  4. Jun 8, 2016 #3
    first of all my understanding of scattering is shamefully low so please keep in mind....

    σdif. = (z12*z22) / 16Tα2 * 1/ sin4(ϑ/2)
    dΩ= 2πsinϑdϑ
    σR=∫σdif dϑ σdif = dσ/dΩ and the integral borders are 40° and 41°

    now those 105 = ndσr ? where d is the thickness and n = densiti times NA/M

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