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N-14 + alpha -> O-17 + proton

  1. Jan 15, 2010 #1
    N-14 + alpha --> O-17 + proton

    N-14 + alpha particle --> O-17 + high energy proton

    alpha particle used was 7.70MeV.

    Q1. Calculate the energy to be shared in the interaction.

    Q2. Explain why the proton cannot take all of the available energy.




    The following date is given for nuclide and their mass:
    Hydrogen mass: 1.007825u, Helium 4.002603u, N-14 14.003074u, O-17 16.999132u




    I tried converting the mass of N into energy in eV and adding it to 7.70MeV. Not sure what to do then.

    The answer given to Q1 is 6.5MeV

    The explanation for Q2 is not given.
     
  2. jcsd
  3. Jan 15, 2010 #2

    vela

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    Re: N-14 + alpha --> O-17 + proton

    Use conservation of energy: total energy initial = total energy final.
     
  4. Jan 15, 2010 #3
    Re: N-14 + alpha --> O-17 + proton

    Mass of N = 14.003074 * 1.66 x 10^(-27)
    = 2.32 x 10^(-26) kg

    Energy of N = 13075 MeV

    Initial E = 13075 + 7.70 = 13,083 MeV


    Final E from the Rest Mass of O and the proton = 16,814 MeV

    So change in E = 3731MeV

    and this is for the inital E, because that is the one which has less E when just taking into account the rest mass.

    The answer should be 6.5MeV which is shared AFTER the interaction?
     
  5. Jan 15, 2010 #4

    vela

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    Re: N-14 + alpha --> O-17 + proton

    What about the mass of the alpha particle?
     
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