Spectral Intensities of Antiprotons and the lifetime of Cosmic Rays in the Galaxy - INSPIRE

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Spectral Intensities of Antiprotons and the lifetime of Cosmic Rays in the Galaxy

May 1, 2015

16 pages

Part of Proceedings, 34th International Cosmic Ray Conference (ICRC 2015) : The Hague, The Netherlands, July 30-August 6, 2015, 548

Published in:

PoS ICRC2015 (2016) 548

Contribution to:

- ICRC 2015
, 548

Published: Jul 14, 2015 by SISSA

e-Print:

1505.00305 [astro-ph.HE]

DOI:

10.22323/1.236.0548

View in:

ADS Abstract Service

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Abstract: (arXiv)

In this paper we note that the spectral intensities of antiprotons observed in Galactic cosmic rays in the energy range ~ 1-100 GeV by BESS, PAMELA and AMS instruments display nearly the same spectral shape as that generated by primary cosmic rays through their interaction with matter in the interstellar medium, without any significant modifications. More importantly, a constant residence time of ~ 2.5 +/-0.7 million years in the Galactic volume, independent of the energy of cosmic rays, matches the observed intensities. A small additional component of secondary antiprotons in the energy below 10 GeV, generated in cocoon-like regions surrounding the cosmic-ray sources, seems to be present. We discuss this result in the context of observations of other secondary components like positrons and Boron, and conclude with general remarks about the origins and propagation of cosmic rays.

Note:

14 pages, 5 figures

cosmic radiation: galaxy
cosmic radiation: energy
cosmic radiation: propagation
cosmic radiation: primary
anti-p: secondary
VHE
spectral
positron
lifetime
PAMELA

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Figures(0)

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