Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl


Preferences help
enabled [disable] Abstract
Number of results


2007 | 5 | 4 | 528-538

Article title

Significance of the second dip in the ultra-high energy cosmic ray spectrum



Title variants

Languages of publication



A new feature in the spectrum of ultra high energy cosmic rays (UHECR) has been announced in the paper by Berezinsky, Gazizov and Kachelrieβ. The ratio of the solution of the exact transport equation to its solution in the continuous energy loss limit shows intriguing features which, according to the Authors, are related to the very nature of the energy loss processes of UHECR: the very sharp second dip predicted at 6.3 × 1019 eV can be used as an energy calibration point and also as the UHECR mass indicator for big future cosmic ray experiments. In the present paper we would like to advocate that this statement is an overinterpretation. The second dip is a result of an inappropriate approximation used, and thus it cannot help to understand the nature of UHECR in any way.


  • Theoretical Physics Departement, University of Łódź Cosmic Ray Laboratory, Soltan Institute for Nuclear Studies, Uniwersytecka 5, 90-950, Łódź, Poland


  • [1] V. Berezinsky, A. Gazizov and M. Kachelrieβ: “Second dip as a signature of ultrahigh energy proton interactions with cosmic microwave background radiation”, Phys. Rev. Lett., Vol. 97, (2006), art. 231101.
  • [2] J. Szabelski, T. Wibig and A.W. Wolfendale: “Cosmic rays of the highest energies: The case for extragalactic heavy nuclei”, Astropart. Phys., Vol. 17, (2002), pp. 125–131. http://dx.doi.org/10.1016/S0927-6505(01)00142-6[Crossref]
  • [3] T. Wibig and A.W. Wolfendale: “Ultra high energy cosmic rays”, subm. J. Phys. G.
  • [4] T. Wibig and A.W. Wolfendale: “Ultra-high energy cosmic rays from transient extragalactic sources”, J. Phys. G, Vol. 30, (2004), pp. 525–542. http://dx.doi.org/10.1088/0954-3899/30/4/012[Crossref]
  • [5] T. Wibig and A.W. Wolfendale: “At what particle energy do extragalactic cosmic rays start to predominate?”, J. Phys. G, Vol. 31, (2005), pp. 255–264; G. Sigl: “Non-Universal Spectra of Ultrahigh Energy Cosmic Ray Primaries and Secondaries in a Structured Universe”, Preprint: arXiv:astro-ph/0703403. http://dx.doi.org/10.1088/0954-3899/31/3/005

Document Type

Publication order reference


YADDA identifier

JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.