Look Up Calculated Q Values for Beta Decay

Write proton number Z:

Write mass number A:

Please note that the Q values listed here are calculated Q values. For the purpose of determining if a nucleus is stable with respect to beta decay, it is more accurate to use experimental masses, if such masses are available. For beta plus and electron-capture (EC) decay we list only the Q value for EC decay.

Downloading of the beta-decay Q-values data file

The entire data file of calculated Q values for β- decay Qβ- and Q values for β+ decay Qβ+ may be downloaded by clicking here. The format of the file is, in FORTRAN notation (2I5,2F10.2), and each record contains:

Z, N, Qβ- (MeV), Qβ+ (MeV)

If the Q value cannot be calculated because the ground-state masses required for the determination were not calculated then the value -20000.00 is listed.

Page by Robert MacFarlane and Peter Möller
ryxm@lanl.gov, moller@lanl.gov
created April 1996, last modified 1 May 2012