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Hi,When a nucleus does [itex]\beta[/itex]-decay[tex]_Z^A X

  1. Jan 10, 2012 #1


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    When a nucleus does [itex]\beta[/itex]-decay
    _Z^A X \rightarrow _{Z+1}^A Y + e^- + \overline{\nu}
    The daughter nucleus has one more charge than the mother nucleus, so it will take an electron into its cloud. Why is this electron's contribution to the Q-value said to cancel that from the emitted [itex]\beta[/itex] particle? The [itex]\beta[/itex] particle is created in the reaction so that obviously gives a [itex]-m_e c^2[/itex] in the Q-value. But the absorbed electron exists before and after the reaction, so I don't see how it should have any effect.

  2. jcsd
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