  We review recent results obtained in the scattering theory of dissipative
quantum systems representing the long-time evolution of a system $S$
interacting with another system $S'$ and susceptible of being absorbed by $S'$.
The effective dynamics of $S$ is generated by an operator of the form $H = H_0
+ V - \mathrm{i} C^* C$ on the Hilbert space of the pure states of $S$, where
$H_0$ is the self-adjoint generator of the free dynamics of $S$, $V$ is
symmetric and $C$ is bounded. The main example is a neutron interacting with a
nucleus in the nuclear optical model. We recall the basic objects of the
scattering theory for the pair $(H,H_0)$, as well as the results, proven in
arXiv:1703.09018 and arXiv:1808.09179, on the spectral singularities of $H$ and
the asymptotic completeness of the wave operators. Next, for the nuclear
optical model, we show that asymptotic completeness generically holds.
