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DOE OSTI · 3707623

Qualifying LaBr3:Ce+Sr detector performance for the Mu2e experiment at Fermilab Using the ELBE Accelerator

Huang, Shihua [Purdue U., West Lafayette]·Cao, Haichuan [Purdue U., West Lafayette]·Chen, Jijun [Purdue U., West Lafayette]·Koltick, David [Purdue U., West Lafayette] (ORCID:0000000218543121)·Beyer, Roland [HZDR, Dresden]·Ferrari, Anna [HZDR, Dresden]·Knodel, Oliver [HZDR, Dresden]·Müller, Stefan E. [HZDR, Dresden]·Rachamin, Reuven [HZDR, Dresden]·Ufer, Robert [HZDR, Dresden]·Voigt, Martin [HZDR, Dresden]·Edmonds, Andrew [Boston U.]·Israel, Scott [Boston U.]·Miller, James [Boston U.]·Alvarez-Garcia, Claudia [Manchester U.]·Lancaster, Mark [Manchester U.]·Keshavarzi, Alexander [University Coll. London]·Chislett, Rebecca [University Coll. London]·Motuk, Erdem [University Coll. London]·Plesniak, Pawel [University Coll. London]·Harkness-Brennan, Laura [Liverpool U.]·Judson, Dan [Liverpool U.]·Price, Joseph [Liverpool U.]·Werkema, Steve [Fermilab]
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Abstract

A LaBr3:Ce+Sr detector will be used to measure the stopped muon captures at the Mu2e experiment at Fermilab. It has been benchmarked in a test beam experiment performed at the ELBE electron accelerator located at the Helmholtz-Zentrum Dresden-Rossendorf, Germany. ELBE’s pulsed bremsstrahlung beam line was set to deliver an average γ -ray energy of between 4–5 MeV. The detector response was mapped to match Mu2e beam conditions, including rates up to 1 Mcps, energy flux, and time structure. A radioactive calibration source was used to mimic the characteristic 1808.7 keV γ -ray, emitted during the atomic muon nuclear capture in the Mu2e aluminum stopping target. The detector energy resolution was measured as a function of the average energy flux: up to 1 TeV/s for 0.34 s, the steady-operation beam-on time and up to 4 TeV/s for 5 ms to get a conservative estimate of the effect of high intensity Mu2e beam fluctuations. The PMT gain variation as a function of the beam spill length and average intensity has been parametrized and corrected for. When a PMT gain correction corresponding to the average beam-spill intensity is applied, the residual effect of beam intensity fluctuations around the average degrades the energy resolution, σ E γ /E γ , at 1808.7 keV from 0.66% to 0.83%.

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Huang, Shihua [Purdue U., West Lafayette], Cao, Haichuan [Purdue U., West Lafayette], Chen, Jijun [Purdue U., West Lafayette], Koltick, David [Purdue U., West Lafayette] (ORCID:0000000218543121), Beyer, Roland [HZDR, Dresden], Ferrari, Anna [HZDR, Dresden], Knodel, Oliver [HZDR, Dresden], Müller, Stefan E. [HZDR, Dresden], Rachamin, Reuven [HZDR, Dresden], Ufer, Robert [HZDR, Dresden], Voigt, Martin [HZDR, Dresden], Edmonds, Andrew [Boston U.], Israel, Scott [Boston U.], Miller, James [Boston U.], Alvarez-Garcia, Claudia [Manchester U.], Lancaster, Mark [Manchester U.], Keshavarzi, Alexander [University Coll. London], Chislett, Rebecca [University Coll. London], Motuk, Erdem [University Coll. London], Plesniak, Pawel [University Coll. London], Harkness-Brennan, Laura [Liverpool U.], Judson, Dan [Liverpool U.], Price, Joseph [Liverpool U.], Werkema, Steve [Fermilab]. 2026-08-24. Qualifying LaBr3:Ce+Sr detector performance for the Mu2e experiment at Fermilab Using the ELBE Accelerator. https://doi.org/10.1016/j.nima.2026.171987

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