Speaker
Description
The specific geometry of small angle neutron scattering spectrometer YuMO, a central
hole along the neutron beam direction through the two scattering detectors reaching to direct
beam detector (DBD) located at 35 meters from moderator [1-3]
DBD importance return to determine the transmittance of the sample as a function of
wavelength, due to peculiarities of normalization when the ratio between the scattering values
from the sample and the vanadium standard become close to each other. Additional information
about the procedure can be found in [1,2]. Also to monitor occurring changes at reactor power
on long term.
The new direct beam detector at YuMO is a proportional gas detector with solid state
Boron converter [4-8]. Here we present recording for IBR2 neutron spectrum with different
reactor power by processing empty beam spectrum on DBD, it was shown that the detector
works effectively. Also, comparison between new and old DBD detector showed that both are
stably working. However new DBD have higher efficiency.
