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Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV$/n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Adriani, O., Akaike, Y., Asano, K., Asaoka, Y., Berti, E., Betti, P., Bigongiari, G., Binns, W. R., Bongi, M., Brogi, P., Bruno, A., Cannady, N., Castellini, G., Checchia, C., Cherry, M. L., Collazuol, G., de Nolfo, G. A., Ebisawa, K., Ficklin, A. W., Fuke, H., Gonzi, S., Guzik, T. G., Hams, T., Hibino, K., Ichimura, M., Israel, M. H., Kasahara, K., Kataoka, J., Kataoka, R., Katayose, Y., Kato, C., Kawanaka, N., Kawakubo, Y., Kobayashi, K., Kohri, K., Krawczynski, H. S., Krizmanic, J. F., Maestro, P., Marrocchesi, P. S., Mattiazzi, M., Messineo, A. M., Mitchell, J. W., Miyake, S., Moiseev, A. A., Mori, M., Mori, N., Motz, H. M., Munakata, K., Nakahira, S., Nishimura, J., Negro, M., Okuno, S., Ormes, J. F., Ozawa, S., Pacini, L., Papini, P., Rauch, B. F., Ricciarini, S. B., Sakai, K., Sakamoto, T., Sasaki, M., Shimizu, Y., Shiomi, A., Spillantini, P., Stolzi, F., Sugita, S., Sulaj, A., Takita, M., Tamura, T., Terasawa, T., Torii, S., Tsunesada, Y., Uchihori, Y., Vannuccini, E., Wefel, J. P., Yamaoka, K., Yanagita, S., Yoshida, A., Yoshida, K., Zober, W. V.
Formato:	Preprint
Publicado:	2025
Materias:	High Energy Astrophysical Phenomena
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866918089089613824
author	Adriani, O. Akaike, Y. Asano, K. Asaoka, Y. Berti, E. Betti, P. Bigongiari, G. Binns, W. R. Bongi, M. Brogi, P. Bruno, A. Cannady, N. Castellini, G. Checchia, C. Cherry, M. L. Collazuol, G. de Nolfo, G. A. Ebisawa, K. Ficklin, A. W. Fuke, H. Gonzi, S. Guzik, T. G. Hams, T. Hibino, K. Ichimura, M. Israel, M. H. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kobayashi, K. Kohri, K. Krawczynski, H. S. Krizmanic, J. F. Maestro, P. Marrocchesi, P. S. Mattiazzi, M. Messineo, A. M. Mitchell, J. W. Miyake, S. Moiseev, A. A. Mori, M. Mori, N. Motz, H. M. Munakata, K. Nakahira, S. Nishimura, J. Negro, M. Okuno, S. Ormes, J. F. Ozawa, S. Pacini, L. Papini, P. Rauch, B. F. Ricciarini, S. B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Spillantini, P. Stolzi, F. Sugita, S. Sulaj, A. Takita, M. Tamura, T. Terasawa, T. Torii, S. Tsunesada, Y. Uchihori, Y. Vannuccini, E. Wefel, J. P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Zober, W. V.
author_facet	Adriani, O. Akaike, Y. Asano, K. Asaoka, Y. Berti, E. Betti, P. Bigongiari, G. Binns, W. R. Bongi, M. Brogi, P. Bruno, A. Cannady, N. Castellini, G. Checchia, C. Cherry, M. L. Collazuol, G. de Nolfo, G. A. Ebisawa, K. Ficklin, A. W. Fuke, H. Gonzi, S. Guzik, T. G. Hams, T. Hibino, K. Ichimura, M. Israel, M. H. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kobayashi, K. Kohri, K. Krawczynski, H. S. Krizmanic, J. F. Maestro, P. Marrocchesi, P. S. Mattiazzi, M. Messineo, A. M. Mitchell, J. W. Miyake, S. Moiseev, A. A. Mori, M. Mori, N. Motz, H. M. Munakata, K. Nakahira, S. Nishimura, J. Negro, M. Okuno, S. Ormes, J. F. Ozawa, S. Pacini, L. Papini, P. Rauch, B. F. Ricciarini, S. B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Spillantini, P. Stolzi, F. Sugita, S. Sulaj, A. Takita, M. Tamura, T. Terasawa, T. Torii, S. Tsunesada, Y. Uchihori, Y. Vannuccini, E. Wefel, J. P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Zober, W. V.
contents	The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray (CR) iron and sub-iron events over a wide energy interval. In this paper we report an update of our previous measurement of the iron flux and we present - for the first time - a high statistics measurement of the spectra of two sub-iron elements Cr and Ti in the energy interval from 10 to 250 GeV/n. The analyses are based on 8 years of data. Differently from older generations of cosmic-ray instruments which, in most cases, could not resolve individual sub-iron elements, CALET can identify each nuclear species from proton to nickel (and beyond) with a measurement of their electric charge. Thanks to the improvement in statistics and a more refined assessment of systematic uncertainties, the iron spectral shape is better resolved, at high energy, than in our previous paper and we report its flux ratio to chromium and titanium. The measured fluxes of Cr and Ti show energy dependences compatible with a single power law with spectral indices $-2.74 \pm 0.06$ and $-2.88 \pm 0.06$, respectively.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_08643
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV$/n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS Adriani, O. Akaike, Y. Asano, K. Asaoka, Y. Berti, E. Betti, P. Bigongiari, G. Binns, W. R. Bongi, M. Brogi, P. Bruno, A. Cannady, N. Castellini, G. Checchia, C. Cherry, M. L. Collazuol, G. de Nolfo, G. A. Ebisawa, K. Ficklin, A. W. Fuke, H. Gonzi, S. Guzik, T. G. Hams, T. Hibino, K. Ichimura, M. Israel, M. H. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kobayashi, K. Kohri, K. Krawczynski, H. S. Krizmanic, J. F. Maestro, P. Marrocchesi, P. S. Mattiazzi, M. Messineo, A. M. Mitchell, J. W. Miyake, S. Moiseev, A. A. Mori, M. Mori, N. Motz, H. M. Munakata, K. Nakahira, S. Nishimura, J. Negro, M. Okuno, S. Ormes, J. F. Ozawa, S. Pacini, L. Papini, P. Rauch, B. F. Ricciarini, S. B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Spillantini, P. Stolzi, F. Sugita, S. Sulaj, A. Takita, M. Tamura, T. Terasawa, T. Torii, S. Tsunesada, Y. Uchihori, Y. Vannuccini, E. Wefel, J. P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Zober, W. V. High Energy Astrophysical Phenomena The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray (CR) iron and sub-iron events over a wide energy interval. In this paper we report an update of our previous measurement of the iron flux and we present - for the first time - a high statistics measurement of the spectra of two sub-iron elements Cr and Ti in the energy interval from 10 to 250 GeV/n. The analyses are based on 8 years of data. Differently from older generations of cosmic-ray instruments which, in most cases, could not resolve individual sub-iron elements, CALET can identify each nuclear species from proton to nickel (and beyond) with a measurement of their electric charge. Thanks to the improvement in statistics and a more refined assessment of systematic uncertainties, the iron spectral shape is better resolved, at high energy, than in our previous paper and we report its flux ratio to chromium and titanium. The measured fluxes of Cr and Ti show energy dependences compatible with a single power law with spectral indices $-2.74 \pm 0.06$ and $-2.88 \pm 0.06$, respectively.
title	Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV$/n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2507.08643