Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl

N. J. Spinks; L. J. Bignell; G. J. Lane; A. Akber; E. Barberio; T. Baroncelli; B. J. Coombes; J. T.H. Dowie; T. K. Eriksen; M. S.M. Gerathy; T. J. Gray; I. Mahmood; B. P. McCormick; W. J.D. Melbourne; A. J. Mitchell; F. Nuti; M. S. Rahman; F. Scutti; A. E. Stuchbery; H. Timmers; P. Urquijo; Y. Y. Zhong; M. J. Zurowski

doi:10.1016/j.nima.2022.167773

Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl

N. J. Spinks^*, L. J. Bignell, G. J. Lane, A. Akber, E. Barberio, T. Baroncelli, B. J. Coombes, J. T.H. Dowie, T. K. Eriksen, M. S.M. Gerathy, T. J. Gray, I. Mahmood, B. P. McCormick, W. J.D. Melbourne, A. J. Mitchell, F. Nuti, M. S. Rahman, F. Scutti, A. E. Stuchbery, H. TimmersP. Urquijo, Y. Y. Zhong, M. J. Zurowski

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

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 energies greater than 10 keV.

Original language	English
Article number	167773
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	1047
DOIs	https://doi.org/10.1016/j.nima.2022.167773
Publication status	Published - Feb 2023

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Spinks, N. J., Bignell, L. J., Lane, G. J., Akber, A., Barberio, E., Baroncelli, T., Coombes, B. J., Dowie, J. T. H., Eriksen, T. K., Gerathy, M. S. M., Gray, T. J., Mahmood, I., McCormick, B. P., Melbourne, W. J. D., Mitchell, A. J., Nuti, F., Rahman, M. S., Scutti, F., Stuchbery, A. E., ... Zurowski, M. J. (2023). Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1047, Article 167773. https://doi.org/10.1016/j.nima.2022.167773

@article{91414bac86ae4f16b81a11ff7f7e4809,

title = "Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl",

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 energies greater than 10 keV.",

keywords = "Dark matter, Electron recoil, NaI:Tl, Nuclear recoil, Pulse shape discrimination, Scintillation",

author = "Spinks, {N. J.} and Bignell, {L. J.} and Lane, {G. J.} and A. Akber and E. Barberio and T. Baroncelli and Coombes, {B. J.} and Dowie, {J. T.H.} and Eriksen, {T. K.} and Gerathy, {M. S.M.} and Gray, {T. J.} and I. Mahmood and McCormick, {B. P.} and Melbourne, {W. J.D.} and Mitchell, {A. J.} and F. Nuti and Rahman, {M. S.} and F. Scutti and Stuchbery, {A. E.} and H. Timmers and P. Urquijo and Zhong, {Y. Y.} and Zurowski, {M. J.}",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2023",

month = feb,

doi = "10.1016/j.nima.2022.167773",

language = "English",

volume = "1047",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

publisher = "Elsevier B.V.",

}

Spinks, NJ, Bignell, LJ , Lane, GJ, Akber, A, Barberio, E, Baroncelli, T, Coombes, BJ, Dowie, JTH, Eriksen, TK, Gerathy, MSM, Gray, TJ, Mahmood, I, McCormick, BP, Melbourne, WJD, Mitchell, AJ, Nuti, F, Rahman, MS, Scutti, F, Stuchbery, AE, Timmers, H, Urquijo, P, Zhong, YY & Zurowski, MJ 2023, 'Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 1047, 167773. https://doi.org/10.1016/j.nima.2022.167773

Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl. / Spinks, N. J.; Bignell, L. J.; Lane, G. J. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1047, 167773, 02.2023.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl

AU - Spinks, N. J.

AU - Bignell, L. J.

AU - Lane, G. J.

AU - Akber, A.

AU - Barberio, E.

AU - Baroncelli, T.

AU - Coombes, B. J.

AU - Dowie, J. T.H.

AU - Eriksen, T. K.

AU - Gerathy, M. S.M.

AU - Gray, T. J.

AU - Mahmood, I.

AU - McCormick, B. P.

AU - Melbourne, W. J.D.

AU - Mitchell, A. J.

AU - Nuti, F.

AU - Rahman, M. S.

AU - Scutti, F.

AU - Stuchbery, A. E.

AU - Timmers, H.

AU - Urquijo, P.

AU - Zhong, Y. Y.

AU - Zurowski, M. J.

PY - 2023/2

Y1 - 2023/2

N2 - 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 energies greater than 10 keV.

AB - 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 energies greater than 10 keV.

KW - Dark matter

KW - Electron recoil

KW - NaI:Tl

KW - Nuclear recoil

KW - Pulse shape discrimination

KW - Scintillation

UR - http://www.scopus.com/inward/record.url?scp=85143298680&partnerID=8YFLogxK

U2 - 10.1016/j.nima.2022.167773

DO - 10.1016/j.nima.2022.167773

M3 - Article

SN - 0168-9002

VL - 1047

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

M1 - 167773

ER -

Spinks NJ, Bignell LJ , Lane GJ, Akber A, Barberio E, Baroncelli T et al. Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2023 Feb;1047:167773. doi: 10.1016/j.nima.2022.167773

Pulse Shape Discrimination of low-energy nuclear and electron recoils for improved particle identification in NaI:Tl

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