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Description
Characterization of Different Size Deuterated Liquid Scintillator Detectors
Authors: S. Dalal, K. Banerjee, P. Roy, P. Pant, R. Shil, B. Layek, S.R.
Singh, S. Adhikary, S. Roy, S. Sadhukhan, S. Dawn
Corresponding Author: s.dalal@vecc.gov.in
Abstract:
Detecting neutrons in coincidence with other charged particles offers a more
detailed view of the cluster structure configurations of light-mass nuclei [1].
However, the time-of-flight (TOF) technique would be challenging due to the
requirement of a long flight path (few meters) to achieve a reasonable resolu-
tion. In such experiments, the pulse height unfolding (PHU) technique offers an
effective alternative, since its resolution depends on the detector’s pulse height
resolution rather than the detector-to-source distance.
The deuterated liquid scintillator EJ315 offers superior pulse height reso-
lution compared to the conventional hydrogen-based BC501A scintillator [2].
However, the angular uncertainty of detected neutrons depends on the detec-
tor’s dimensions: smaller detectors reduce angular spread but lower efficiency,
whereas larger detectors improve efficiency but increase angular uncertainty for
a fixed detector-to-source distance. Therefore, optimizing detector size requires
a comprehensive study of PHU performance, neutron–γ discrimination capabil-
ity, and efficiency.
In this work, the scintillator light output as a function of recoiled deuteron
energy, along with the pulse height resolution, were determined for two detectors
of different sizes having dimensions 2′′ × 2′′ and 3′′ × 3′′ using mono-energetic
neutrons from the 7Li(p, n)7Be and 11B(p, n)11C reactions. These functions
were incorporated into Geant4 simulations to generate pulse height distribu-
tions in the energy range 1-15 MeV with 0.25 MeV intervals. The resulting
distributions were used to construct a response matrix for unfolding. Finally,
the unfolded spectra were compared for two detector sizes. Additionally the
neutron-γ separation and detection efficiency were also compared for the two
detectors.
References
[1] A. Kundu, R. Palit, M. Rodriguez-Gallardo, A.M. Moro, P. Dey et al.,
Phys. Lett. B 864, 139441 (2025).
[2] Chris C. Lawrence, Andreas Enqvist, Marek Flaska, Sara A. Pozzi, F.D.
Becchetti et al., Nucl. Instr. Meth. A 727, 21 (2013).
| Position | Research student |
|---|---|
| Affiliation | Variable Energy Cyclotron Centre |
| Country | India |