On-orbit energy calibration of the calorimeter on the ISS-CREAM instrument using the boronated scintillator detector

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2021-07-12

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conference papers and proceedings
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Chen, Yu et al.; On-orbit energy calibration of the calorimeter on the ISS-CREAM instrument using the boronated scintillator detector; 37th International Cosmic Ray Conference (ICRC 2021), 12 July, 2021; https://pos.sissa.it/395/074/pdf

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Abstract

The Cosmic Ray Energetics And Mass instrument on the International Space Station (ISSCREAM) aims to measure the energy spectra of cosmic ray (CR) nuclei from Z=1 to Z=26 with energies from 10¹² eV to 10¹⁵ eV. The calorimeter (CAL) was designed to measure the energy of the CR particles. The ISS-CREAM on-orbit data provide evidence that the CAL may have either suffered from an efficiency problem or its energy scale may be in need of calibration. As a result, a careful scrutiny of the absolute energy calibration of the CAL is required. We describe an approach to calibrate the energy scale using the on-orbit data of the boronated scintillator detector, which is independent of the CAL data and reduces potential bias. We discuss the issues revealed by the on-orbit data, demonstrate how this can be corrected using the boronated scintillator detector and present preliminary results.