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Monte Carlo modeling of sub-keV backgrounds in superconducting tunnel junctions from gamma-ray interactions for SALER@FRIB

Borbridge, Keith W.
; 
Leach, Kyle G.
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2024-04
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2024 Spring Undergraduate Research Symposium
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https://hdl.handle.net/11124/179046
 https://doi.org/10.25676/11124/179046
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Abstract
The new Superconducting Array for Low-Energy Radiation (SALER) experiment at FRIB aims to directly embed short-lived isotopes in superconducting tunnel junction (STJ) sensors to measure nuclear recoil energies from weak decay as a search for BSM physics. At these eVscale energies, small energy depositions from simultaneous higher-energy events (since as gamma rays) generate backgrounds which are important to understand. I will present the first Monte Carlo modeling using the test case of 137Cs decays where a 662 keV gamma-ray is emitted and deposits small energies in the silicon substrate of the STJ as a critical first step towards background characterization for SALER@FRIB.
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