Measurement of the cosmic-ray secondary-to-primary ratios with CALET on the International Space Station

Akaike, Yosui; Maestro, P.

doi:10.22323/1.395.0112

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Note that AMS-02 and CALET (as well as PAMELA) agree on the flux ratio C/O. Finally, we note that the normalisation of the boron flux measured by CALET is similarly lower than found by AMS-02 while the boron-to-carbon ratios agree [52]. A similar comment applies to the iron measurements, recently presented by AMS-02 [53] and CALET [51].…”

Section: Discrepanciessupporting

confidence: 81%

Rapporteur Talk: Cosmic Ray Direct

Mertsch¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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This is the report on the cosmic ray direct track of the 37 th International Cosmic Ray Conference (ICRC 2021), broadly covering the contributions relating to charged cosmic rays (CRs) of Galactic origin. The contributions highlighted here are of both observational and theoretical nature and aim at interpreting the local fluxes of CRs as well as studying the wider dynamical effects of CRs. New data from space-borne experiments on CR electrons and positrons, proton and helium as well as heavier nuclei and their isotopes are reviewed. We cover some models of CR acceleration and their feedback on Galactic scales. Diffuse emission in -rays as far as it concerns the CR spectra in the immediate vicinity of the solar system and CR anisotropies are covered briefly. Some upcoming and proposed experiments are highlighted towards the end.

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Section: Discrepanciessupporting

confidence: 81%

Rapporteur Talk: Cosmic Ray Direct

Mertsch¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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“…The iron spectrum to 2.0 TeV/n and nickel spectrum to 240 GeV/n were also published in [28,30]. Preliminary results of the boron spectrum and the B/C ratio were also presented [37]. In addition, CALET has the potential to study the UHCR, as well as gamma-ray measurements, GRB observations, searches of GW event counterparts, DM searches, and space weather observations.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 8 shows the preliminary energy spectrum of boron from 16 GeV/n to 2.2 TeV/n [37] compared with PAMELA [25] and AMS-02 [38]. The isotope composition is assumed as 11 B/( 10 B+ 11 B)= 0.7.…”

Section: Preliminary Boron Spectrum and B/c Ratiomentioning

confidence: 99%

“…CALET boron spectrum is consistent with PAMELA but lower than AMS-02 like the cases of C, O, and Fe spectra. Figure 9 show the preliminary result of B/C ratio from 16 GeV/n to 2.2 TeV/n [37] compared with the previous observations [20,25,[38][39][40][41][42]. The present result of the B/C ratio can be fitted with a power law function (B/C)= AE −δ , where A is a constant normalization factor, the spectral indices are δ = 0.406 ± 0.039 in 25 GeV/n withχ 2 /ndf= 0.30/3, and δ = 0.366 ± 0.064 in 100 GeV/n -2.2 TeV/n withχ 2 /ndf= 1.2/7.…”

Section: Preliminary Boron Spectrum and B/c Ratiomentioning

confidence: 99%

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Direct measurements of cosmic rays with the calorimetric electron telescope on the international space station

Akaike,

Adriani,

Asano

et al. 2023

SciPost Phys. Proc.

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The CALorimetric Electron Telescope, CALET, has been measuring high-energy cosmic rays on the International Space Station since October 13, 2015. The scientific objectives addressed by the mission are to search for possible nearby sources of high-energy electrons and potential signatures of dark matter, and to investigate the details of galactic cosmic-ray acceleration and propagation. The calorimetric instrument, which is 30 radiation lengths or 1.3 proton interaction lengths thick with fine imaging capability, is optimized to measure cosmic-ray electrons by achieving large proton rejection and excellent energy resolution well into the TeV region. In addition, very wide dynamic range of energy measurement and individual charge identification capability enable us to measure proton and nuclei spectra from a few tens GeV to a PeV scale. Nearly 20 million cosmic-ray shower events over 10 GeV per month are triggered and the continuous observation has been kept without any major interruption since the start of operation. Using the data obtained over 6.5 years of operation, we will present a brief summary of the CALET observation including electron spectrum, and proton and nuclei spectra as well as the performance study on orbit with MC simulations.

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Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

Adriani¹,

Akaike²,

Asano³

et al. 2022

Phys. Rev. Lett.

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A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV and the observation of a softening of the spectrum above 10 TeV is reported. The analysis is based on the data collected during ∼6.2 years of smooth operations aboard the International Space Station (ISS) and covers a broader energy range with respect to the previous proton flux measurement by CALET, with an increase of the available statistics by a factor of ∼2.2. Above a few hundred GeV we confirm our previous observation of a progressive spectral hardening with a higher significance (more than 20 sigma). In the multi-TeV region we observe a second spectral feature with a softening around 10 TeV and a spectral index change from −2.6 to −2.9 consistently, within the errors, with the shape of the spectrum reported by DAMPE. We apply a simultaneous fit of the proton differential spectrum which well reproduces the gradual change of the spectral index encompassing the lower energy power-law regime and the two spectral features observed at higher energies.

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Measurement of the cosmic-ray secondary-to-primary ratios with CALET on the International Space Station

Cited by 5 publications

References 7 publications

Rapporteur Talk: Cosmic Ray Direct

Rapporteur Talk: Cosmic Ray Direct

Direct measurements of cosmic rays with the calorimetric electron telescope on the international space station

Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

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