Novel event classification based on spectral analysis of scintillation waveforms in Double Chooz

Abrahão, T, Almazan, H, Anjos, J C D, Appel, S, Bekman, I, Bezerra, T J C, Bezrukov, L, Blucher, E, Brugière, T, Buck, C, Busenitz, J, Cabrera, A, Camilleri, L, Cerrada, M, Chauveau, E, The Double Chooz collaboration, and others, (2018) Novel event classification based on spectral analysis of scintillation waveforms in Double Chooz. Journal of Instrumentation, 13. aP01031 1-24. ISSN 1748-0221

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Liquid scintillators are a common choice for neutrino physics experiments, but their capabilities to perform background rejection by scintillation pulse shape discrimination is generally limited in large detectors. This paper describes a novel approach for a pulse shape based event classification developed in the context of the Double Chooz reactor antineutrino experiment. Unlike previous implementations, this method uses the Fourier power spectra of the scintillation pulse shapes to obtain event-wise information. A classification variable built from spectral information was able to achieve an unprecedented performance, despite the lack of optimization at the detector design level. Several examples of event classification are provided, ranging from differentiation between the detector volumes and an efficient rejection of instrumental light noise, to some sensitivity to the particle type, such as stopping muons, ortho-positronium formation, alpha particles as well as electrons and positrons. In combination with other techniques the method is expected to allow for a versatile and more efficient background rejection in the future, especially if detector optimization is taken into account at the design level.

Item Type: Article
Keywords: Digital signal processing (DSP), Particle identification methods, Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators), Neutrino detectors
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 15 Nov 2021 15:22
Last Modified: 15 Nov 2021 15:30

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