  To model the process of absorption and emission of quanta by an extremal
D1-D5 black hole in the dual CFT, we consider transitions between different
Ramond vacua via absorption and emission of chiral primaries. We compute the
probabilities to reach different CFT states starting with a special Ramond
vacuum, using techniques of the orbifold CFT. It is found that the processes
involving the change of angular momentum by $k$ units are suppressed as 1/N^k
