Speaker
Description
The CALorimetric Electron Telescope (CALET) is a space-based calorimetric
instrument, designed to carry out precise measurements of high energy cosmic rays. Installed on the Japanese Experiment Module – Exposed Facility on the ISS, it is collecting data with excellent performance and no significant interruptions since October 2015. We present the updated results of the direct measurement of the energy spectrum of cosmic-ray helium, based on more than 9 years of collected data, with an expected statistical increase of about 40% compared with the previously published measurement. The helium flux shows significant deviations from a single power law with a progressive hardening around a few hundred GeV followed by a softening in the multi-TeV region. Moreover, a different analysis procedure, based on machine learning approach, has been developed to improve the event selection efficiency at the highest energies. The increase in statistics, combined with the more sophisticated analysis procedure, allows to extend the upper limit of the measured energy range and to improve the precision of the measurement itself in the high energy part of the spectrum.
| Collaboration(s) | CALET |
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