| Autor: |
Luo, X. L., Modamio, V., Nyberg, J., Valiente-Dobon, J. J., Nishada, Q., de Angelis, G., Agramunt, J., Egea, F. J., Erduran, M. N., Erturk, S., de France, G., Gadea, A., Gonzalez, V., Goasduff, A., Huyuk, T., Jaworski, G., Moszynski, M., Di Nitto, A., Palacz, M., Soederstroem, P. -A. |
| Rok vydání: |
2018 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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