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Homework Help: Neutron emission

  1. Jun 2, 2007 #1
    1. The problem statement, all variables and given/known data
    1)Neutron emission is not a possible mode of decay for K(40,19).Why?


    2. Relevant equations



    3. The attempt at a solution

    I think it is because the neutron to proton ratio for potassium(40,19) is almost unity(more precisely N/P=1.1). So, neutron emission is not a mode of decay to gain stability. Is it right?
     
  2. jcsd
  3. Jun 2, 2007 #2

    Meir Achuz

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    No. You have to look at the nucleus it would decay to, and compare masses.
     
  4. Jun 3, 2007 #3
    I found the Q value of the reaction and obtained a negative value(-7.8 MeV).
    K(40,19)---> K(39,19) + neutron
    So, it doesn't have sufficient energy for neutron emission to take place. Is that what u meant?
     
  5. Jun 3, 2007 #4

    Meir Achuz

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    Yes............
     
  6. Jun 3, 2007 #5
    Cool!Thanx mate.
     
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