Gamma Energy Spectra Due to Neutron Capture

These gamma energy plots were collected by taking 1 keV neutrons incident on a 50 cm thick, 5 cm radius cylindrical block of Gd. The data files for this simulation is 1keVNeutron1000k_GdCapSpectrum.root.

As a general note, the maximum energy of gamma generated by neutron capture on Gd should be 8.5 MeV (with another peak at 7.9 MeV for a different isotope of Gd). The sum of the initial energies of these gammas should be no more than one of these two values depending on the isotope of Gd on which the capture occurred. For these lower energy neutrons, this behavior is consistent with what we expect. One additional note: all the captured neutrons here are tagged as primaries.

Figure 1: Gamma Energy, Individual	Figure 2: Gamma Energy, Individual (log)
Figure 1: Gamma Energy Sum	Figure 4: Gamma Energy Sum (log)