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Results from the CsI Calorimeter onboard the 2023 ComPair Balloon Flight

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arxiv 2405.06839 v4 pith:EUNWJ5E7 submitted 2024-05-10 astro-ph.IM nucl-ex

classification astro-ph.IMnucl-ex
keywords calorimetergamma-rayballooncompairdetectorenergyflightonboard
verification ladder T0 review T1 audit T2 compute T3 formal
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The ComPair gamma-ray telescope is a technology demonstrator for a future gamma-ray telescope called the All-sky Medium Energy Gamma-ray Observatory (AMEGO). The instrument is composed of four subsystems, a double-sided silicon strip detector, a virtual Frisch grid CdZnTe calorimeter, a CsI:Tl based calorimeter, and an anti-coincidence detector (ACD). The CsI calorimeter's goal is to measure the position and energy deposited from high-energy events. To demonstrate the technological readiness, the calorimeter has flown onboard a NASA scientific balloon as part of the GRAPE-ComPair mission and accumulated around 3 hours of float time at an altitude of 40 km. During the flight, the CsI calorimeter observed background radiation, Regener-Pfotzer Maximum, and several gamma-ray activation lines originating from aluminum.

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  1. Background Measurements and Simulations of the ComPair Balloon Flight

    astro-ph.IM 2025-06 conditional novelty 6.0 of 10

    ComPair's first balloon flight measured the gamma-ray background at 40 km and matched Monte Carlo simulations, validating the detector's charged-particle rejection and event reconstruction.

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