  We study the tree level scattering or emission of n closed superstrings from
a decaying non-BPS brane in Type II superstring theory. We attempt to calculate
generic n-point superstring disk amplitudes in the rolling tachyon background.
We show that these can be written as infinite power series of Toeplitz
determinants, related to expectation values of a periodic function in Circular
Unitary Ensembles. Further analytical progress is possible in the special case
of bulk-boundary disk amplitudes. These are interpreted as probability
amplitudes for emission of a closed string with initial conditions perturbed by
the addition of an open string vertex operator. This calculation has been
performed previously in bosonic string theory, here we extend the analysis for
superstrings. We obtain a result for the average energy of closed superstrings
produced in the perturbed background.
