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I Reaction Q value and threshold energy

  1. May 17, 2017 #1
    In order to calculate the energy of a reaction's ejectile, we make use of the concepts of the conservation of energy and momentum along with the reaction Q energy. However, if there is a threshold energy with above zero, meaning Q value is negative, do we have to consider the threshold energy as we calculate the energy of the ejectile?

    Thank you!
     
  2. jcsd
  3. May 17, 2017 #2

    mfb

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    The energy of the incoming particles has to be high enough to meet this threshold, and the threshold energy enters the calculations.
     
  4. May 17, 2017 #3
    If the incoming particle's energy is higher than the threshold energy, then we should consider the energy of the particle, not the threshold energy, should not we? And also Q-value enters the calculations, but it is, in this circumstances, negative. Am I right?
     
  5. May 17, 2017 #4

    mfb

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    Both are relevant.
    That is very closely linked to the threshold energy.
     
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