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B+ and B- decay

  1. Apr 14, 2009 #1
    1. The problem statement, all variables and given/known data
    There are 2 problems

    #1. How much energy is released when 14C decays into 14N by B emission?

    #2. What is the maximum KE of the emitted B particle during the decay of 60Co?

    2. Relevant equations
    E = (Mass parent - Mass daughter - Mass of B particle?) * 931.5 MeV


    3. The attempt at a solution
    For question 1, the book did E = (M parent - M daughter)*931.5 MeV = (14.003242 - 14.003074) * 931.5 = .156 MeV

    For question 2, the book did KE = (M parent - M daughter - M B particle) * 931.5 = ( 59.933822 - 59.930791 - .000549) * 931.5 = 2.31 MeV

    Why did the book not subtract the mass of the B particle in the first and it did subtract the mass of it in the second problem? Thanks for the help
     
  2. jcsd
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