NeuLAND - FAIR

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x position (cm)
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Figure 4.5.: Simulation of the error in determination of the first interaction point in x
(left) and z position (right) for 470 MeV neutrons in LAND.
neutron energy simulated eff. GEANT3 simulated eff.GEANT4 measured
(MeV) (%) (%) (%)
270 80 88 85(7)
470 92 93 93(2)
600 96 95 94(1)
800 97 96 96(1)
1050 98 98 96(1)
Table 4.2.: Efficiencies for the neutron detection with LAND simulated with GEANT3
and GEANT4 are compared to the measured values from a calibration experiment
[Bor-03].
one set of parameters the variation of spectra with the neutron beam energy are well
described by the GEANT3 simulations. The largest deviations can be seen for the lowest
neutron energy of 170 MeV.
For the detailed response and resolution studies laid out in section 4.5, we decided to use
primarily the R 3 BRoot framework, since it can be used in a later stage for an identical
treatment of simulated and real data. The GEANT3 interface was selected for practical
reasons.
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