Precision Measurement of Cosmic-Ray Antiproton Spectrum
Astrophysics
2011-04-20 v1
Abstract
The energy spectrum of cosmic-ray antiprotons has been measured in the range 0.18 to 3.56 GeV, based on 458 antiprotons collected by BESS in recent solar-minimum period. We have detected for the first time a distinctive peak at 2 GeV of antiprotons originating from cosmic-ray interactions with the interstellar gas. The peak spectrum is reproduced by theoretical calculations, implying that the propagation models are basically correct and that different cosmic-ray species undergo a universal propagation. Future BESS flights toward the solar maximum will help us to study the solar modulation and the propagation in detail and to search for primary antiproton components.
Keywords
Cite
@article{arxiv.astro-ph/9906426,
title = {Precision Measurement of Cosmic-Ray Antiproton Spectrum},
author = {S. Orito and T. Maeno and H. Matsunaga and K. Abe and K. Anraku and Y. Asaoka and M. Fujikawa and M. Imori and M. Ishino and Y. Makida and N. Matsui and H. Matsumoto and J. Mitchell and T. Mitsui and A. Moiseev and M. Motoki and J. Nishimura and M. Nozaki and J. Ormes and T. Saeki and T. Sanuki and M. Sasaki and E. S. Seo and Y. Shikaze and T. Sonoda and R. Streitmatter and J. Suzuki and K. Tanaka and I. Ueda and N. Yajima and T. Yamagami and A. Yamamoto and T. Yoshida and K. Yoshimura},
journal= {arXiv preprint arXiv:astro-ph/9906426},
year = {2011}
}
Comments
REVTeX, 4 pages including 4 eps figures