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I Double Beta Decay Rates

  1. Jun 10, 2018 #1
    Hey everyone,

    I've learned about double beta decay and neutrinoless double beta decay recently. So we have two "conditions" for decay, 2v decay and 0v decay. Now, to the question I have:

    There have been a lot of experiments measuring 2v decay rates, and there have been many experiments concerning a limit on Majorana mass for neutrinos in 0v decay. We have the following equation for 2v double beta decay rates:

    (T 2v1/2)-1 = G2v | M2v | 2

    Where G is the phase space factor and M is the nuclear matrix element.

    So I've acquired this list of values that correspond to the G and M values for 2ν Double Beta Decay values, and I am calculating the rate for the 2v Decay of 48Ca:

    M value (Nuclear Matrix Element): ~0.05
    (G2v)-1 value: 9.7 X 1016 y x MeV-2

    So my question is, in order to acquire the decay rate, do all I need to do is multiply these values? I know it seems silly to ask, but please bear with me. I am a high school student who is learning all of this physics for the first time (at a college), it just seems a little crazy that it could just be as simple as that :smile:

    Thank you in advance!
    -Aakash Sunkari
    Last edited by a moderator: Jun 10, 2018
  2. jcsd
  3. Jun 11, 2018 #2


    Staff: Mentor

    Do you get the correct units that way? If not, there is something missing.
    This is a very useful thing to check in general. It doesn't help with dimensionless constants, but they are not that common.
  4. Jun 11, 2018 #3
    Thank you for your quick reply! I'll calculate it later today, and update this thread on my results.
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