Relative Composition and Energy Spectra of Light Nuclei in Cosmic Rays: Results from AMS-01

Relative Composition and Energy Spectra of Light Nuclei in Cosmic Rays: Results from AMS-01

Measurement of the chemical and isotopic composition of cosmic rays is essential for the precise understanding of their propagation in the galaxy. While the model parameters are mainly determined using the B/C ratio, the study of extended sets of ratios can provide stronger constraints on the propag...

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Bibliographic Details
Main Authors: Becker, R., Becker, Ulrich J., Berges, P., Burger, Joseph D., Cai, X. D., Capell, Michael H., Dai, T. S., Eppling, Frederic J., Fisher, Peter H., Galaktionov, Y., Klimentov, A., Kounine, Andrei, Koutsenko, Vladimir, Lebedev, Alexei, Luckey, P. David, Jr., Shoutko, V., Siedenburg, T., Steuer, M., Ting, Samuel C. C., Ting, Susan Marks, Wu, Xiaohua Sherry, Xu, S., Zhou, F.
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: IOP Publishing 2013
Online Access:http://hdl.handle.net/1721.1/76316
https://orcid.org/0000-0002-4436-6077
https://orcid.org/0000-0001-7831-7460
https://orcid.org/0000-0002-0450-7007
https://orcid.org/0000-0002-5006-6847
https://orcid.org/0000-0003-3513-8408
https://orcid.org/0000-0002-8667-5660
https://orcid.org/0000-0002-0236-7274
https://orcid.org/0000-0002-7172-9021
Description
Summary:Measurement of the chemical and isotopic composition of cosmic rays is essential for the precise understanding of their propagation in the galaxy. While the model parameters are mainly determined using the B/C ratio, the study of extended sets of ratios can provide stronger constraints on the propagation models. In this paper, the relative abundances of light-nuclei lithium, beryllium, boron, and carbon are presented. The secondary-to-primary ratios Li/C, Be/C, and B/C have been measured in the kinetic energy range 0.35-45 GeV nucleon[superscript –1]. The isotopic ratio [superscript 7]Li/[superscript 6]Li is also determined in the magnetic rigidity interval 2.5-6.3 GV. The secondary-to-secondary ratios Li/Be, Li/B, and Be/B are also reported. These measurements are based on the data collected by the Alpha Magnetic Spectrometer AMS-01 during the STS-91 space shuttle flight in 1998 June. Our experimental results are in substantial agreement with other measurements, where they exist. We describe our light-nuclei data with a diffusive-reacceleration model. A 10%-15% overproduction of Be is found in the model predictions and can be attributed to uncertainties in the production cross-section data.

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