gamma detection - FNDA 2011
gamma detection - FNDA 2011
gamma detection - FNDA 2011
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Fast neutron inelastic scattering at the nELBE facility<br />
Plastics efficiency<br />
Seite 35<br />
Measurement at PTB:<br />
- Mono-energetic neutrons<br />
- Beyer et al., NIMA 575 (2007) 449<br />
Measurement at HZDR:<br />
- nELBE spectrum<br />
- Relative to 235U fission chamber<br />
NEFF7:<br />
- well established code for neutron<br />
<strong>detection</strong> efficiency simulation<br />
- developed at PTB<br />
Modified NEFF7:<br />
- Cuboid detector geometry<br />
- Double sided readout<br />
- Scintillation light propagation and<br />
attenuation<br />
- PMT Quantum efficiency<br />
- Threshold = one photo electron per<br />
PMT<br />
Problems:<br />
In simulation:<br />
- Unknown light output function at low energy transfer<br />
In measurement:<br />
- Collimated beam at nELBE<br />
- Influence of lead shielding
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