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Timing Characterization of Helium-4 Fast Neutron Detector with EJ-309 Organic Liquid Scintillator.
- Source :
-
EPJ Web of Conferences . 2018, Vol. 170, p1-5. 5p. 2 Color Photographs, 1 Diagram, 1 Chart, 6 Graphs. - Publication Year :
- 2018
-
Abstract
- Recently, the Helium-4 gas fast neutron scintillation detectors is being used in time-sensitive measurements, such time-of-flight and multiplicity counting. In this paper, a set of time aligned signals was acquired in a coincidence measurement using the Helium-4 gas detectors and EJ-309 liquid scintillators. The high-speed digitizer system is implanted with a trigger moving average window (MAW) unit combing with its constant fraction discriminator (CFD) feature. It can calculate a “time offset” to the timestamp value to get a higher resolution timestamp (up to 50 ps), which is better than the digitizer's time resolution (4 ns) [1]. The digitized waveforms were saved to the computer hard drive and post processed with digital analysis code to determine the difference of their arrival times. The full-width at half-maximum (FWHM) of the Gaussian fit was used as to examine the resolution. For the cascade decay of Cobalt-60 (1.17 and 1.33 MeV), the first version of the Helium-4 detector with two Hamamatsu R580 photomultipliers (PMT) installed at either end of the cylindrical gas chamber (20 cm in length and 4.4 cm in diameter) has a time resolution which is about 3.139 ns FWHM. With improved knowledge of the timing performance, the Helium-4 scintillation detectors are excellent for neutron energy spectrometry applications requiring high temporal and energy resolutions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NEUTRON counters
*SCINTILLATORS
*HELIUM
*GAS detectors
*GAUSSIAN distribution
Subjects
Details
- Language :
- English
- ISSN :
- 21016275
- Volume :
- 170
- Database :
- Academic Search Index
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Conference
- Accession number :
- 127350880
- Full Text :
- https://doi.org/10.1051/epjconf/201817007005