  We show how the charge symmetry of strong interactions can be used to relate
the proton and neutron asymptotic normalization coefficients (ANCs) of the one
nucleon overlap integrals for light mirror nuclei. This relation extends to the
case of real proton decay where the mirror analog is a virtual neutron decay of
a loosely bound state. In this case, a link is obtained between the proton
width and the squared ANC of the mirror neutron state. The relation between
mirror overlaps can be used to study astrophysically relevant proton capture
reactions based on information obtained from transfer reactions with stable
beams.
