  We propose a simple phenomenological theory for quantum tunneling of Cooper
pairs based on their boson like nature. Thus it applies in the absence of
quasiparticle excitations (fermions), and should be suitable for boson like
particles at the low energy regime. Around zero bias voltage our model reveals
a rapid increase in tunneling current which rapidly saturates. This manifests
as a zero bias conductance peak that strongly depends on the superconductors
transition temperature. This low energy tunneling of Cooper pairs could serve
as an alternative explanation for a number of tunneling experiments where zero
bias conductance peak has been observed.
