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Characterisation of Hamamatsu R11065-20 PMTs for use in the SABRE South NaI(Tl) Crystal Detectors

by Leaver, K T , Janssens, K , Dastgiri, F , Bignell, L J , G Fu , Stanley, O , Stuchbery, A E , Melbourne, W J D , Scutti, F , Milligan, L J , Bolognino, I , Fruth, T , Taylor, G N , Kapoor, S , Lane, G J , Xing, Y , McKenzie, J , Bashu, V U , Suerfu, B , Brooks, G , Mews, M , Chhun, S S , Urquijo, P , Barberio, E , McGee, P , McNamara, P C , Zhong, Y Y , Rule, K J , Hill, G C , McKie, L J , Slavkovska, Z , James, R S , Williams, A G , Froehlich, M B

in Calibration / Crystals / Dark matter / Decision trees / Experiments / Hemispheres / Machine learning / Monte Carlo simulation / Noise threshold / Photomultiplier tubes

2025

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Characterisation of Hamamatsu R11065-20 PMTs for use in the SABRE South NaI(Tl) Crystal Detectors

in Calibration / Crystals / Dark matter / Decision trees / Experiments / Hemispheres / Machine learning / Monte Carlo simulation / Noise threshold / Photomultiplier tubes

2025

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Characterisation of Hamamatsu R11065-20 PMTs for use in the SABRE South NaI(Tl) Crystal Detectors

in Calibration / Crystals / Dark matter / Decision trees / Experiments / Hemispheres / Machine learning / Monte Carlo simulation / Noise threshold / Photomultiplier tubes

2025

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Paper

Characterisation of Hamamatsu R11065-20 PMTs for use in the SABRE South NaI(Tl) Crystal Detectors

Leaver, K T,

Janssens, K,

Dastgiri, F,

Bignell, L J,

G Fu,

Stanley, O,

Stuchbery, A E,

Melbourne, W J D,

Scutti, F,

Milligan, L J,

Bolognino, I,

Fruth, T,

Taylor, G N,

Kapoor, S,

Lane, G J,

Xing, Y,

McKenzie, J,

Bashu, V U,

Suerfu, B,

Brooks, G,

Mews, M,

Chhun, S S,

Urquijo, P,

Barberio, E,

McGee, P,

McNamara, P C,

Zhong, Y Y,

Rule, K J,

Hill, G C,

McKie, L J,

Slavkovska, Z,

James, R S,

Williams, A G,

Froehlich, M B

2025

Overview

The SABRE Experiment is a direct detection dark matter experiment using a target composed of multiple NaI(Tl) crystals. The experiment aims to be an independent check of the DAMA/LIBRA results with a detector in the Northern (Laboratori Nazionali Del Gran Sasso, LNGS) and Southern (Stawell Underground Physics Laboratory, SUPL) hemispheres. The SABRE South photomultiplier tubes (PMTs) will be used near the low energy noise threshold and require a detailed calibration of their performance and contributions to the background in the NaI(Tl) dark matter search, prior to installation. We present the development of the pre-calibration procedures for the R11065-20 Hamamatsu PMTs. These PMTs are directly coupled to the NaI(Tl) crystals within the SABRE South experiment. In this paper we present methodologies to characterise the gain, dark rate, and timing properties of the PMTs. We develop a method for in-situ calibration without a light injection source. Additionally we explore the application of machine learning techniques using a Boosted Decision Tree (BDT) trained on the response of single PMTs to understand the information available for background rejection. Finally, we briefly present the simulation tool used to generate digitised PMT data from optical Monte Carlo simulations.

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Cornell University Library, arXiv.org

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