How to Calculate Q Value for Beta-Decay Using Atomic Masses?

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SUMMARY

The calculation of the Q value for beta decay involves the formula Q = (M1 - M2)c² - mec², where M1 and M2 represent the atomic masses of the parent and daughter nuclei, respectively, and mec² accounts for the mass of the electron. In cases of electron capture, only a neutrino is emitted, simplifying the calculation. For accurate results, users can utilize the online Q-value calculator available at http://t2.lanl.gov/data/astro/molnix96/qbeta.html.

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PonderingMick
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Can someone please tell me how to calculate this?

My notes are such a mess. Is it as simple as Q = (Mx-My)c2 using atomic masses?

Cheers,

Mick
 
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I believe you have to also include the electron mass when you calculate the Q value for beta decay, because the electron (or positron) has to be created (in nearly every case):

Q = (M1 - M2)c2 - mec2

There is a special case, called electron capture, or k-capture, where the nucleus captures an atomic electron and emits only a neutrino.

You can compare your numbers with this online Q-value calculator:

http://t2.lanl.gov/data/astro/molnix96/qbeta.html
 

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