  The first photon emission and the disentanglement of a pair of identical
bosonic atoms in excited entangled states follow an exponential law. We extend
the theory to distinguishable and identical fermionic two-atom systems. As a
byproduct of the analysis we determine the symmetries of the fermionic wave
function. We also derive the emission distributions of excited atoms in product
states, which must take into account the presence of simultaneous detections.
Comparing both distributions reveals a direct manifestation of the
modifications induced by entanglement on the atomic emission properties.
