D2O bank

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Relative photon flux

Flux 4111.png

Flux 4126.png

Flux 4138.png

Flux 4148.png

Flux 4161.png

Flux 4162.png

Flux 4164.png

Flux 4185.png

Flux 4186.png

Flux 4187.png

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.

Flux fluctns.png

RunTime runNum.png

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.

Neutron energy D2O bank1.png


Neutron energy D2O bank2.png