Speaker
Description
Neutron response function of CeBr3 detector for
1.25-5.75 MeV neutron energy range.
Povolotskiy M.A.1,2, Sobolev Yu.G.1, Stukalov S.S.1, Bezbakh A.A.1,
Penionzhkevich Yu.E.1,2, Salakhutdinov G.Kh2, Naumov P.Yu2
1 JINR, Joint Institute for Nuclear Research, 141980, Dubna, Russia;
2 MEPhI, National Research NuclearUniversity,115409, Moscow, Russia;
E-mail: mark.povolotskiy@gmail.com
The results of measurements of neutron detection efficiency ε(En), En ≈ 1.25 ÷ 5.75 MeV for
scintillation CeBr3 detector of MULTI setup [1] are presented. The measurements of the energy dependence of efficiency ε(En) were carried out by tagged neutron method using 239Pu/9Be n-γ source.
Trigger-detector was used for registering γ-quanta Eγ = 4.44 MeV accompanied by ~60% of events of neutron emission from source 239Pu/9Be. Neutron energy values was taken from the time of flight (TOF) measurements.
The ε(En) measurements have shown that CeBr3 detector have a relatively high neutron detection efficiency which is weakly dependent on the energy values in the region En≈1.25÷5.75 MeV. For example, efficiency is ε(En)≈24,6% in energy range En=1.25÷5.75 MeV at the threshold 60 keV for CeBr3 detector (5×5×5 сm3). It was found that efficiency have strong dependence on threshold values, see Fig 1. The mean efficiency <ε> as a function of threshold values is presented in Fig 1.
In comparison stilbene detectors that are often used for neutron detection have good n-γ pulse shape separation, but sharp energy dependence of the efficiency ε(En).
This research was funded by the Russian Science Foundation, project No. 24-22-00117.
-
Zeinulla Z. et al. GAMMA-RAY SPECTROMETER ASSEMBLED FROM 9× CeBr3-NaI (Tl) PHOSWICH DETECTORS //Acta Physica Polonica B, Proceedings Supplement. – 2021. – Т. 14. – №. 4. – С. 755-760.
-
Siváček I. et al. The MULTI spectrometer for measurement of β-decay process in exotic nuclei //EPJ Web of Conferences. – EDP Sciences, 2021. – Т. 253. – С. 01003.
