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Durham University

Department of Physics

Staff profile

Publication details for Prof Sir Arnold Wolfendale

Erlykin, AD, Fatemi, SJ & Wolfendale, AW (2000). Fine structure in the energy spectrum of cosmic ray protons at 50 GeV? Physics Letters B 482(4): 337-342.
  • Publication type: Journal Article
  • ISSN/ISBN: 0370-2693
  • Keywords: SPECTROSCOPY

Author(s) from Durham


The recently published precise spectrum of cosmic ray protons from the
Alpha Magnetic Spectrometer has been examined in some detail from the
standpoint of a search for deviations from a smooth, simple, power law.
We find a significant excess (similar or equal to 10% over similar to
0.3 interval in log E) centered on 50 GeV in the published data. It is
possible that the 'unfolding technique' adopted by the experimenters
causes an ova estimate of the excess but it is difficult to reduce it
much below about (5 +/- 2)%.
We have examined other recent data, too, There is also evidence here,
for an excess in the same energy region, although of only (1.6 +/-
0.9)%. A value of (3 +/- 1.5)% would be consistent with all the data.
There are hints of similar excesses for heavier nuclei and electrons.
Possible explanations are put forward for an excess, should it prove to
be genuine. (C) 2000 Elsevier Science B.V, All rights reserved.