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Homework Help: Energy of fission

  1. Apr 12, 2008 #1
    1. The problem statement, all variables and given/known data

    Find the energy which comes out with fission of the nucleus of deuterium and tritium, so we receive like product the nucleus of helium.

    mass of tritium[tex]m(\stackrel{3}{1}H)=3,016049u[/tex]
    mass of the nucleus of deuterium [tex]m(\stackrel{2}{1}H)=2,013553u[/tex]
    mass of the nucleus of helium [tex]m(\stackrel{4}{2}He)=4,002603u[/tex]

    2. Relevant equations

    [tex]\Delta E=\Delta m c^2[/tex]

    3. The attempt at a solution

    The nuclear reaction

    [tex]\stackrel{2}{1}H + \stackrel{3}{1}H \rightarrow \stackrel{4}{2}He + \stackrel{1}{0}n + energy[/tex]

    How will I find the mass of triton( the nucleus of tritium) ?
  2. jcsd
  3. Apr 12, 2008 #2

    Andrew Mason

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    Take the mass of the atom and subtract the mass of the electron. The binding energy of the electron is not enough to make a significant difference in the mass of the atom.

  4. Apr 13, 2008 #3

    0,018334*931,494 MeV=17,078011 MeV

    And in my text book results it is 17,8 MeV. Is their fault?
  5. May 4, 2008 #4


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    The answer should be 17.6MeV, this is well known reaction to me.

    And you will obtain that answer if you use [tex]m(\stackrel{2}{1}H)=2,014101783u[/tex]

    Edit, link:
    http://www.nndc.bnl.gov/amdc/masstables/Ame2003/mass.mas03 [Broken]
    Last edited by a moderator: May 3, 2017
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