%\subsection{The escaping particle and coherent effects \editor{Gunter}}

When a nucleon other than the incident particle leaves the nucleus,
the ground state of the nucleus changes. The energy of the outgoing
particle cannot be such that the total mass of the new nucleus would
be below its ground state mass. To avoid this, we reduce the energy of
an outgoing nucleons by the mass-difference  of old and new nucleus.

Furthermore, the momentum of the final exited nucleus derived from
energy momentum balance may be such that its mass is below its ground
state mass. In this case, we arbitrarily scale the momenta of all
outgoing particles by a factor derived from the mass of the nucleus
and the mass of the system of outgoing particles.