%0 Journal Article
%T Pulse pile-up identification and reconstruction for liquid scintillator based neutron detectors
%A Luo, X. L. et al
%A Agramunt, J.
%A Egea, F. J.
%A Gadea, A.
%A Huyuk, T.
%J Nuclear Instruments & Methods in Physics Research A
%D 2018
%V 897
%I Elsevier Science Bv
%@ 0168-9002
%G English
%F Luo_etal2018
%O WOS:000433206800010
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3591), last updated on Mon, 11 Jun 2018 12:41:46 +0000
%X The issue of pulse pile-up is frequently encountered in nuclear experiments involving high counting rates, which will distort the pulse shapes and the energy spectra. A digital method of off-line processing of pile-up pulses is presented. The pile-up pulses were firstly identified by detecting the downward-going zero-crossings in the first-order derivative of the original signal, and then the constituent pulses were reconstructed based on comparing the pile-up pulse with four models that are generated by combining pairs of neutron and.. standard pulses together with a controllable time interval. The accuracy of this method in resolving the pile-up events was investigated as a function of the time interval between two pulses constituting a pile-up event. The obtained results show that the method is capable of disentangling two pulses with a time interval among them down to 20 ns, as well as classifying them as neutrons or gamma rays. Furthermore, the error of reconstructing pile-up pulses could be kept below 6% when successive peaks were separated by more than 50 ns. By applying the method in a high counting rate of pile-up events measurement of the NEutron Detector Array (NEDA), it was empirically found that this method can reconstruct the pile-up pulses and perform neutron-gamma discrimination quite accurately. It can also significantly correct the distorted pulse height spectrum due to pile-up events.
%K Pile-up
%K Digital
%K First-order derivative
%K Neutron-gamma discrimination
%K Liquid scintillator
%R 10.1016/j.nima.2018.03.078
%U https://doi.org/10.1016/j.nima.2018.03.078
%P 59-65