AI Article Synopsis
- The study measures how the boron flux in cosmic rays changes with energy and compares it to carbon flux using data from the Calorimetric Electron Telescope (CALET) over approximately 6.4 years.
- The researchers found a hardening in the boron spectrum beginning at around 200 GeV/n, indicating that boron and carbon have different energy dependences despite the observed similarities at certain transition energies.
- They also suggest that the B/C ratio, along with their findings, supports recent observations indicating that secondary cosmic rays like boron experience more significant energy hardening than primary ones.
Article Abstract
We present the measurement of the energy dependence of the boron flux in cosmic rays and its ratio to the carbon flux in an energy interval from 8.4 GeV/n to 3.8 TeV/n based on the data collected by the Calorimetric Electron Telescope (CALET) during ∼6.4 yr of operation on the International Space Station. An update of the energy spectrum of carbon is also presented with an increase in statistics over our previous measurement. The observed boron flux shows a spectral hardening at the same transition energy E_{0}∼200 GeV/n of the C spectrum, though B and C fluxes have different energy dependences. The spectral index of the B spectrum is found to be γ=-3.047±0.024 in the interval 25
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http://dx.doi.org/10.1103/PhysRevLett.129.251103 DOI Listing Publication Analysis
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