@article{a1a15ade834e4da69637b127a7517165,
title = "Boron flux in cosmic rays and its flux ratio to primary species measured with CALET on the International Space Station",
abstract = "We present the measurement of the energy spectrum of the boron flux in cosmic rays based on the data collected by the CALorimetric Electron Telescope (CALET) during 7.25 years of operation on the International Space Station. The energy spectrum is measured from 8.4 GeV/n to 3.8 TeV/n with an all calorimetric instrument with a total thickness corresponding to 1.3 nuclear interaction length and equipped with charge detectors capable of single element resolution. The observed boron flux shows a spectral hardening at the same transition energy E0 ∼ 200 GeV/n of the carbon and oxygen spectra, though B flux has a different energy dependence with respect to C and O. Within the limitations of our data{\textquoteright}s present statistical significance, the boron spectral index change is found to be slightly larger than that of carbon and oxygen, which are similar. A corresponding break in the energy dependence of the B/C and B/O flux ratios also supports the idea that the secondary cosmic rays exhibit a stronger hardening than primary ones. Moreover, interpreting our data with a Leaky Box model, we argue that the trend of the energy dependence of the B/C and B/O ratios in the TeV/n region could suggest a possible presence of a residual propagation path length, compatible with the hypothesis that a fraction of secondary B nuclei can be produced near the cosmic-ray source.",
author = "{CALET collaboration} and P. Maestro and Y. Akaike and O. Adriani and Y. Akaike and K. Asano and Y. Asaoka and E. Berti and G. Bigongiari and Binns, {W. R.} and M. Bongi and P. Brogi and A. Bruno and N. Cannady and G. Castellini and C. Checchia and Cherry, {M. L.} and G. Collazuol and {de Nolfo}, {G. A.} and K. Ebisawa and Ficklin, {A. W.} and H. Fuke and S. Gonzi and Guzik, {T. G.} and T. Hams and K. Hibino and M. Ichimura and K. Ioka and W. Ishizaki and Israel, {M. H.} and K. Kasahara and J. Kataoka and R. Kataoka and Y. Katayose and C. Kato and N. Kawanaka and Y. Kawakubo and K. Kobayashi and K. Kohri and Krawczynski, {H. S.} and Krizmanic, {J. F.} and P. Maestro and Marrocchesi, {P. S.} and Messineo, {A. M.} and Mitchell, {J. W.} and S. Miyake and Moiseev, {A. A.} and M. Mori and N. Mori and Motz, {H. M.} and K. Munakata and S. Nakahira and J. Nishimura and S. Okuno and Ormes, {J. F.} and S. Ozawa and L. Pacini and P. Papini and Rauch, {B. F.} and Ricciarini, {S. B.} and K. Sakai and T. Sakamoto and M. Sasaki and Y. Shimizu and A. Shiomi and P. Spillantini and F. Stolzi and S. Sugita and A. Sulaj and M. Takita and T. Tamura and T. Terasawa and S. Torii and Y. Tsunesada and Y. Uchihori and E. Vannuccini and Wefel, {J. P.} and K. Yamaoka and S. Yanagita and A. Yoshida and K. Yoshida and Zober, {W. V.}",
note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons.; 38th International Cosmic Ray Conference, ICRC 2023 ; Conference date: 26-07-2023 Through 03-08-2023",
year = "2024",
month = sep,
day = "27",
language = "English",
volume = "444",
journal = "Proceedings of Science",
issn = "1824-8039",
}