Self-absorption and Phonon Pulse Shape Discrimination in Scintillating Bolometers

Kim, Geon-Bo

doi:10.1007/s10909-020-02365-x

Title: Self-absorption and Phonon Pulse Shape Discrimination in Scintillating Bolometers

Journal Article · Tue Feb 11 00:00:00 EST 2020 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/s10909-020-02365-x· OSTI ID:1814086

^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

In this work, we show that self-absorption of photons in scintillating bolometers can differentiate phonon pulse shapes between α (or nuclear recoil) and β/γ signals. This enables phonon pulse shape discrimination for particle identification. We establish a detector signal model that includes self-absorption and compare the simulated phonon pulse shapes with previously reported experimental results. The model predicts increase in pulse shape difference at higher self-absorption. Based on this result, we propose a new design of scintillating bolometers using 4π light reflectors for maximized self-absorption and only a single phonon readout, instead of light detectors that are typically employed for particle discrimination in scintillating bolometers.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1814086

Report Number(s):: LLNL-JRNL-825077; 1039178; TRN: US2213397

Journal Information:: Journal of Low Temperature Physics, Vol. 199, Issue 3-4; ISSN 0022-2291

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Self-absorption and Phonon Pulse Shape Discrimination in Scintillating Bolometers

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