Performance of a first multi-cell WOM-based liquid scintillator detector as prototype for the SHiP Surrounding Background Tagger

M. Böhles; A. Brignoli; P. Deucher; C. Eckardt; H. Fischer; A. Hollnagel; A. Krolla; H. Lacker; P. Luther; F. Lyons; J. Molins i Bertram; T. Molzberger; A. S. Müller; S. Ochoa Guaman; F. Rehbein; T. J. Rock; M. Schaaf; C. Scharf; M. Schumann; J. M. Webb; J. Wenk; I. Wöstheinrich; M. Wurm

arXiv · 2607.22477

Performance of a first multi-cell WOM-based liquid scintillator detector as prototype for the SHiP Surrounding Background Tagger

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Abstract

The Search for Hidden Particles (SHiP) Experiment was approved by CERN in 2024. Feebly-interacting particles that are produced in a proton Beam Dump Facility (BDF) will decay in the 50m-long Decay Volume of the experiment, which needs to be enveloped by a hermetic veto detector: The Surrounding Background Tagger (SBT). Its technology relies on liquid scintillator, composed of linear alkylbenzene and 2,5-diphenyloxazole, as active detector material and Wavelength-shifting Optical Module (WOM) tubes collecting the primary scintillation photons. The liquid scintillator volume is segmented in large cells of typically 120cm x 80cm x 20cm that are equipped with two WOMs each. Here, we report on the performance of a full-scale 2x2-cell prototype detector which was exposed to 5GeV muons at the CERN PS T9 test beam facility to study the detector response and its time and spatial resolution for minimum ionising particles crossing multiple detector cells.

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M. Böhles, A. Brignoli, P. Deucher, C. Eckardt, H. Fischer, A. Hollnagel, A. Krolla, H. Lacker, P. Luther, F. Lyons, J. Molins i Bertram, T. Molzberger, A. S. Müller, S. Ochoa Guaman, F. Rehbein, T. J. Rock, M. Schaaf, C. Scharf, M. Schumann, J. M. Webb, J. Wenk, I. Wöstheinrich, M. Wurm. 2026-07-24. Performance of a first multi-cell WOM-based liquid scintillator detector as prototype for the SHiP Surrounding Background Tagger. https://arxiv.org/abs/2607.22477

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