ENERGY SPECTRA OF COSMIC-RAY NUCLEI AT HIGH ENERGIES

By H. Ahn, P. Allison, M. G. Bagliesi, L. Barbier, J. Beatty, G. Bigongiari, T. Brandt, J. Childers, N. Conklin, S. Coutu and 23 more. 2009

157 citations recorded by the source corpus.

We present new measurements of the energy spectra of cosmic-ray (CR) nuclei from the second flight of the balloon-borne experiment Cosmic-Ray Energetics And Mass (CREAM). The instrument included different particle detectors to provide redundant charge identification and measure the energy of CRs up to several hundred TeV. The measured individual energy spectra of C, O, Ne, Mg, Si, and Fe are presented up to ∼1014 eV. The spectral shape looks nearly the same for these primary elements and it can be fitted to an E−2.66 ± 0.04 power law in energy. Moreover, a new measurement of the absolute intensity of nitrogen in the 100–800 GeV/n energy range with smaller errors than previous observations, clearly indicates a hardening of the spectrum at high energy. The relative abundance of N/O at the top of the atmosphere is measured to be 0.080 ± 0.025 (stat.)±0.025 (sys.) at ∼800 GeV/n, in good agreement with a recent result from the first CREAM flight.

Subfields: Nuclear and High Energy Physics, Radiation

View Paper: https://www.semanticscholar.org/paper/5dfb58adfb98f4face72b59c09596cc9dc5e2b07

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In Nuclear and High Energy Physics

1. P. Blasi
2. E. Amato
3. E. Seo
4. D. Caprioli
5. A. Spitkovsky
6. G. Morlino
7. D. Ellison

Citations in the corpus

• A database of charged cosmic rays (2013, unknown): “…– CAPRICE94 (1994/08): Boezio et al. (1997, 1999, 2000) A32, page 10 of 13 – CAPRICE98 (1998/05): Boezio et al. (2001a,b); Mocchiutti & Wizard/Caprice Collaboration (2003); Boezio et al. (2003); Papini et al. (2004) – CREAM – CREAM-I (2004/12-2005/01): Ahn et al. (2008); Yoon et al. (2011) –…”
• DISCREPANT HARDENING OBSERVED IN COSMIC-RAY ELEMENTAL SPECTRA (2010, methodology): “The calorimeter energy deconvolution included corrections for both the small energy dependence of shower leakage and the energy resolution, as described in Ahn et al. (2009b).”
• COSMIC-RAY PROTON AND HELIUM SPECTRA FROM THE FIRST CREAM FLIGHT (2011, methodology): “Results from the CREAM experiment such as B/C ratio and heavy elemental spectra are discussed in elsewhere (Ahn et al. 2008, 2009a, 2010).”
• Diffusive propagation of cosmic rays from supernova remnants in the Galaxy. I: spectrum and chemical composition (2011, methodology): “Two important observational findings recently appeared in the literature on cosmic rays: first, the sharp hardening found by ATIC-2 [34], CREAM [17] and PAMELA [35] in both the – 20 – proton and He spectra at ∼ 200 GeV/nucleon; second, the fact that the He spectrum above this energy appears to be ha”