Jul 12 – 23, 2021
Online
Europe/Berlin timezone

Extended measurement of the proton spectrum with CALET on the International Space Station

Jul 14, 2021, 6:00 PM
1h 30m
06

06

Talk CRD | Cosmic Ray Direct Discussion

Speaker

Dr Kazuyoshi Kobayashi (Waseda Research Institute of Science and Engineering, Waseda University)

Description

Calorimetric Electron Telescope (CALET) is aiming to measure the main components of high energy cosmic rays up to ~1 PeV in order to understand the cosmic ray acceleration and propagation. The detector consisting of a charge detector, an imaging calorimeter, and a total absorption calorimeter, is located on the International Space Station. The thickness of the calorimeter corresponds to 30 radiation length and to ~1.3 proton interaction length. Data taking has started in October 2015 and continues stably without any serious troubles. We have taken data for more than 5 years so far. We present the latest result of proton spectrum analysis in the energy region from 50 GeV to several tenths of TeV. A fiducial geometrical factor of ~416 cm2 sr is used. The energy resolution of proton is 30-40%. The remaining background is less than 10% in 50 GeV<E<10 TeV region. Compared to our previous result published in Physical Review Letters in 2019, statistics has been increased by more than two years. Spectral hardening in E=1-10 TeV region is then confirmed with higher statistics. We will newly discuss spectral softening above 10 TeV as well as the proton to helium spectrum ratio.

Keywords

proton; helium; CALET

Collaboration CALET
Subcategory Experimental Results

Primary authors

Dr Kazuyoshi Kobayashi (Waseda Research Institute of Science and Engineering, Waseda University) for the CALET Collaboration

Presentation materials

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