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Critical fission energy question

  1. May 6, 2007 #1
    I have a fission exam next week, can someone help me with this past paper question:

    If you know the masses of two nuclei (A)Z and (A+1)Z, (say masses are (A) and (A+1)) and you know the 'critical fission energy' of (A+1)Z, how do you determine if (A)Z is fissile? if it is not fissile, at what neutron energy would you expect fission to be possible.
     
  2. jcsd
  3. May 6, 2007 #2

    Astronuc

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    Staff: Mentor

    How about comparing the binding energy of the compound nucleus (A+1)Z with the critical energy?
     
  4. May 6, 2007 #3
    is this done by calculating the separation energy? E = m(n) + m(A) - m(A+1)
     
  5. May 6, 2007 #4

    Astronuc

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    Staff: Mentor

    http://hyperphysics.phy-astr.gsu.edu/hbase/nucene/nucbin.html

    yes - it is the mass-energy difference between the reactants and product(s). The energy is released as prompt gamma or as the kinetic energy if there are two or more products.

    Calculate the mass-energy difference between U235+n and U236.
     
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