Topic summary
Beta-stable
Extracted from the Wikipedia article Beta-decay stable isobars.
Beta decay toward minimum mass
However, there are a few odd-odd nuclides between two beta-stable even-even isobars, that predominantly decay to the higher-mass of the two beta-stable isobars. For example, K could either undergo electron capture or positron emission to Ar, or undergo beta minus decay to Ca: both possible products are beta-stable. The former process would produce the lighter of the two beta-stable isobars, yet the latter is more common.