Difference between revisions of "D2O bank"
| Line 42: | Line 42: | ||
[[File:neutron_energy_D2O_bank2.png]] | [[File:neutron_energy_D2O_bank2.png]] | ||
| + | |||
| + | |||
| + | |||
| + | Neutron number vs neutron detector central angle is plotted below: | ||
| + | |||
| + | [[File:neutronNum_angleD2O.png]] | ||
Revision as of 20:24, 3 April 2013
Relative photon flux
Relative photon flux obtained during the experiment using D2O target.
Normalization?
Flux fluctuation over the runs:
run # equivalent 1 corresponds to run 4187, 2 - 4186, 3 - 4185, 4 - 4164, 5 - 4162, 6 - 4161, 7 - 4148, 8 - 4138, 9 - 4126, 10 - 4111.
The thing is that the pair spectrometer is sensitive to the low energy background which may be present in the beam (e- beam finite size and, hence, scraping) so the value of the flux may be affected by low energy component. This thing may not be reflected in the number of neutrons detected by the neutron detectors. So, it is arguable that the pair spectrometer can be used for the flux normalization procedure. One has to investigate the energy spectra of the positrons detected.
Neutron energy spectra
Neutron energy spectra restored from all the runs with D2O target are plotted below. Statistical error bars only presented. All the histograms have same number of channels.
Neutron number vs neutron detector central angle is plotted below:
Statistical errors on the number of neutrons per energy bin are not bad, however, big uncertainties in energy come due to the wide width of the photon peak:
