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The simulation was started by creation of a muonic atom in the emission
layer. The spatial distributions, both in the beam direction *z* and in the
radial direction *r*, of the muonic atom generation could be controlled by
the input file. A uniform distribution in *z* and a Gaussian distribution
with a flat top in *r* were used as nominal input. For determination of the
radial beam distribution, see Section 6.1.
The fraction of muonic protium
to muonic tritium
was
proportional to that of protium to tritium in the target^{}.
The initial energy of the muonic atom was taken to be a Gaussian
distribution with mean 1 eV and standard deviation 1 eV. Hyperfine states
of muonic atoms were populated with the statistical weights, i.e., 25% F=0
and 75% F=1 for both
and ,
which are composites of two spin
one half particles.