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Kinetic energy of alpha particle in cockroft walton experiment.

  1. Oct 25, 2014 #1
    1. The problem statement, all variables and given/known data
    When a 7 3 Li nucleus is bombarded with protons α particles emerge.Calculate the kinetic energy of the alpha particle assuming the kinetic energy of the bombarding proton to be negligible. Given M (7 3 Li)=7.016004a.m.u. M (p)=1.007826a.m.u and M (α)=4.002603a.m.u.

    2. Relevant equations
    7 3 Li + 1 1H --> 24 2He
    Q = (M Li + MH -2Mα)931.5MeV....1

    Kα=n= [MαQ + Kp(Mα - mp)]/2Mα....2

    3. The attempt at a solution
    Using equation 1 Q=(7.016004+1.007826- 2×4.002603) 931.5 =17.35MeV
    It is given that Kp~0 so Kα= Q/2 =8.675MeV
    What do you people think about my solution methods used? The numerical values are matching approximately with the given answers in the text book by the way.

  2. jcsd
  3. Oct 25, 2014 #2


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    2017 Award

    Staff: Mentor

    Sure, looks good.

    What does equation 2 mean? It is not necessary anyway.
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