Published January 1, 2018
| Version v1
Journal article
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Pulse pile-up identification and reconstruction for liquid scintillator based neutron detectors
Creators
- Luo, X. L.
- Modamio, V.1
- Nyberg, J.2
- Valiente-Dobon, J. J.1
- Nishada, Q.2
- de Angelis, G.1
- Agramunt, J.3
- Egea, F. J.
- Erduran, M. N.4
- Erturk, S.5
- de France, G.
- Gadea, A.3
- Gonzalez, V.6
- Goasduff, A.7
- Huyuk, T.3
- Jaworski, G.
- Moszynski, M.
- Di Nitto, A.8
- Palacz, M.9
- Soederstroem, P. -A.
- Soederstroem, P. -A.
- 1. Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Padua, Italy
- 2. Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden
- 3. Univ Valencia, CSIC, IFIC, Valencia, Spain
- 4. Istanbul Sabahattin Zaim Univ, Fac Engn & Nat Sci, Istanbul, Turkey
- 5. Omer Halisdemir Univ, Nigde, Turkey
- 6. Univ Valencia, Dept Elect Engn, E-46071 Valencia, Spain
- 7. Univ Padua, Dipartimento Fis & Astron, Padua, Italy
- 8. Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany
- 9. Univ Warsaw, Heavy Ion Lab, Ul Pasteura 5A, PL-02093 Warsaw, Poland
Description
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.
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