Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl
arXiv:2205.08723 · doi:10.1016/j.nima.2022.167773
Abstract
The scintillation mechanism in NaI:Tl crystals produces different pulse shapes that are dependent on the incoming particle type. The time distribution of scintillation light from nuclear recoil events decays faster than for electron recoil events and this difference can be categorised using various Pulse Shape Discrimination (PSD) techniques. In this study, we measured nuclear and electron recoils in a NaI:Tl crystal, with electron equivalent energies between 2 and 40 keV. We report on a new PSD approach, based on an event-type likelihood; this outperforms the charge-weighted mean-time, which is the conventional metric for PSD in NaI:Tl. Furthermore, we show that a linear combination of the two methods improves the discrimination power at these energies.
12 pages, 12 figures, 1 table
References in corpus (5)
- Annual modulation results from three-year exposure of ANAIS-112
- Studies of Boosted Decision Trees for MiniBooNE Particle Identification
- Non-proportional response between 0.1-100keV energy by means of highly monochromatic synchrotron X-rays
- Characterization of SABRE crystal NaI-33 with direct underground counting
- Quenching factor measurements of sodium nuclear recoils in NaI:Tl determined by spectrum fitting