|MadSci Network: Physics|
Sorry I do not understand your question.... It seems to refer to electron capture, where a proton in the nucleus captures an electron in orbit outside the nucleus and turns into a neutron plus an antineutrino. The lifetime can be related to Heisenberg's uncertainty principle. Other than this, I have no idea what you meant to ask.
Try the links in the MadSci Library for more information on Physics.