Abstract
CALorimetric Electron Telescope (CALET) has been accumulating data of high-energy cosmic rays on the International Space Station since August 2015. In addition to the primary observation of the all-electron spectra, CALET also measures the spectra of nuclei, their relative abundances and secondary-to-primary ratios to the highest energy region ever directly observed in order to investigate details of their origin and propagation in the galaxy. The CALET instrument consists of two layers of segmented plastic scintillators to identify the individual elements from Z = 1 to 40, a 3 radiation length thick tungsten-scintillating ber imaging calorimeter to obtain complementary charge and tracking information, and a 27 radiation length thick segmented PWO calorimeter to measure the energy. In this paper, the capability of CALET to perform nuclei measurements and preliminary energy spectra of heavy nuclei components using 962 days of data is presented.
Highlights
The features of the CALorimetric Electron Telescope (CALET) instrument include very good energy resolution provided by its thick calorimeter and excellent charge resolution and robust track identification based on the segmented scintillator paddles and scintillating fibers
We present the analysis procedure of nuclei measurements and preliminary energy spectra of heavy nuclei components with the data obtained in the period from October 13, 2015 to May 31, 2018
We note that the event selection we have applied here is based on a preliminary analysis as compared to what can eventually be achieved with CALET
Summary
Precision measurements of cosmic-ray spectra and their flux ratios are important to understand their origin and propagation in our galaxy. The non-linearity of the CHD and IMC between detector response and deposit energy which is caused by the scintillation quenching effects is obtained from the flight data. Applying these cuts rejects events with poor charge resolution due to interactions in the CHD or upper IMC layers. The total background ratio is less than 1% for carbon, oxygen and iron, less than 5% for neon, magnesium and silicon
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