Title: Testing FLUKA on neutron activation of Si and Ge at nuclear research reactor using gamma spectroscopy,
Abstract: Samples of two characteristic semiconductor sensor materials, silicon and
germanium, have been irradiated with neutrons produced at the RP-10 Nuclear
Research Reactor at 4.5 MW. Their radionuclides photon spectra have been
measured with high resolution gamma spectroscopy, quantifying four
radioisotopes ($^{28}$Al, $^{29}$Al for Si and $^{75}$Ge and $^{77}$Ge for Ge).
We have compared the radionuclides production and their emission spectrum data
with Monte Carlo simulation results from FLUKA. Thus we have tested FLUKA's low
energy neutron library (ENDF/B-VIIR) and decay photon scoring with respect to
the activation of these semiconductors. We conclude that FLUKA is capable of
predicting relative photon peak amplitudes, with gamma intensities greater than
1%, of produced radionuclides with an average uncertainty of 13%. This work
allows us to estimate the corresponding systematic error on neutron activation
simulation studies of these sensor materials.