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Pulse pile-up identification and reconstruction for liquid scintillator based neutron detectors
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. Acad Mil Med Sci, Natl Innovat Inst Def Technol, Beijing 100010, Peoples R China.
Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Padua, Italy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0001-6996-7605
Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Padua, Italy.
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2018 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 897, p. 59-65Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 897, p. 59-65
Keywords [en]
Pile-up, Digital, First-order derivative, Neutron-gamma discrimination, Liquid scintillator
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-357373DOI: 10.1016/j.nima.2018.03.078ISI: 000433206800010OAI: oai:DiVA.org:uu-357373DiVA, id: diva2:1241730
Funder
Swedish Research CouncilAvailable from: 2018-08-24 Created: 2018-08-24 Last updated: 2018-08-24Bibliographically approved

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