We tabulate the betadecay halflives
T_{β+} and
T_{β} with
respect to GamowTeller transitions.
The β^{+} number is the
halflife with respect to both betaplus and electroncapture decay.
We also tabulate the probabilites
P_{Ak} for producing a final nucleus
with mass number Ak following beta decay and
delayed emission of k neutrons. These probabilities
are closely related to betadelayed neutronemission probabilities.
The betadecay Q values and neutron separation energies
used in these calculations were obtained from
experimental mass differences when such masses
were available, otherwise from calculated masses.
The betadelayed occupation probabilities are only calculated
inside the calculated neutron drip line in the daughter of the
betaminus decay.
Please note that:
1. The halflives are calculated with respect to GamowTeller transitions.
Fermi transitions and forbidden transitions are not considered.
2. The calculated halflives close to stability are fairly uncertain because (a) we do not consider forbidden transitions and (b) close to stability small decay Q values enhance the effect of small uncertainties in the calculated position of the levels involved in the decay. An error of 500 keV in the postion of a level may change the calculated value by many orders of magnitude, or even from say a few minutes to infinity! Far from stability the same absolute error has a much lower effect on the calculated halflife, for example less than a factor of two at betadecay Q values around 10 MeV.

Three different data files are available for downloading:
