Advertisement

Towards Solving the Mass-Composition Problem in Ultra High Energy Cosmic Rays

  • R. AloisioEmail author
  • V. BerezinskyEmail author
NUCLEI, PARTICLES, FIELDS, GRAVITATION, AND ASTROPHYSICS
  • 15 Downloads

Abstract

Using the Auger mass-composition analysis of ultra high energy cosmic rays, based on the shape-fitting of Xmax distributions [1], we demonstrate that mass composition and energy spectra measured by Auger, Telescope Array and HiRes can be brought into good agreement. The shape-fitting analysis of Xmax distributions shows that the measured sum of proton and Helium fractions, for some hadronic-interaction models, can saturate the total flux. Such p + He model, with small admixture of other light nuclei, naturally follows from cosmology with recombination and reheating phases. The most radical assumption of the presented model is the assumed unreliability of the experimental separation of Helium and protons, which allows to consider He/p ratio as a free parameter. The results presented here show that the models with dominant p + He composition explain well the energy spectrum of the dip in the latest (2015–2017) data of Auger and Telescope Array, but have some tension at the highest energies with the expected Greisen–Zatsepin–Kuzmin cutoff. The Auger-Prime upgrade experiment has a great potential to reject or confirm this model.

REFERENCES

  1. 1.
    A. Aab et al. (Auger Collab.), Phys. Rev. D 90, 122006 (2014).ADSCrossRefGoogle Scholar
  2. 2a.
    K. Greisen, Phys. Rev. Lett. 16, 48 (1966);ADSCrossRefGoogle Scholar
  3. 2b.
    G. T. Zatsepin and V. A. Kuzmin, JETP Lett. 4, 78 (1966).ADSGoogle Scholar
  4. 3.
    G. R. Blumenthal, Phys. Rev. D 1, 1596 (1970).ADSCrossRefGoogle Scholar
  5. 4.
    V. Berezinsky, A. Gazizov, and S. Grigorieva, Phys. Rev. D 74, 043005 (2006).ADSCrossRefGoogle Scholar
  6. 5.
    V. Berezinsky, A. Gazizov, and S. Grigorieva, Phys. Lett. B 612, 147 (2005).ADSCrossRefGoogle Scholar
  7. 6.
    R. Aloisio, V. Berezinsky, P. Blasi, A. Gazizov, S. Grigorieva, and B. Hnatyk, Astropart. Phys. 27, 76 (2007).ADSCrossRefGoogle Scholar
  8. 7.
    T. Abu-Zayyad et al., Phys. Rev. Lett. 92, 151101 (2004).ADSCrossRefGoogle Scholar
  9. 8.
    J. Abraham et al., Phys. Rev. Lett. 101, 061101 (2008).ADSCrossRefGoogle Scholar
  10. 9.
    N. M. Gerasimova and I. L. Rozental, Sov. Phys. JETP 14, 350 (1961).Google Scholar
  11. 10.
    R. Aloisio, V. Berezinsky, and S. Grigorieva, Astropart. Phys. 41, 94 (2013).ADSCrossRefGoogle Scholar
  12. 11.
    A. Aab et al. (Auger Collab.), Phys. Rev. D 90, 122005 (2014).ADSCrossRefGoogle Scholar
  13. 12.
    R. U. Abbasi et al. (TA Collab.), Astropart. Phys. 64, 49 (2015).ADSCrossRefGoogle Scholar
  14. 13.
    T. Abu-Zayyad et al. (HiRes-MIA Collab.), Astrophys. J. 557, 686 (2001).ADSCrossRefGoogle Scholar
  15. 14.
    K. Werner, F. M. Liu, and T. Pirtoj, Phys. Rev. C 74, 044902 (2006).ADSCrossRefGoogle Scholar
  16. 15.
    S. Ostapchenko, Phys. Rev. D 74, 014026 (2006).ADSCrossRefGoogle Scholar
  17. 16.
    D. Garcia-Gamez et al. (Auger Collab.), in Proceedings of the ICRC 2011; arXiv:1107.4807.Google Scholar
  18. 17.
    R. Conceicao, S. Andringa, L. Cazon, and M. Pimenta (for the Auger Collaboration), EPJ Web Conf. 52, 03004 (2013); arXiv:1301.0507.Google Scholar
  19. 18.
    L. Collica et al. (Auger Collab.), Eur. Phys. J. Plus 131, 301 (2016); arXiv:1609.02498.Google Scholar
  20. 19.
    W. D. Apel et al. (KASCADE-Grande Collab.), Phys. Rev. Lett. 107, 171104 (2011).ADSCrossRefGoogle Scholar
  21. 20.
    V. S. Berezinsky, S. V. Bulanov, V. A. Dogiel, V. L. Ginzburg, and V. S. Ptuskin, Astrophysics of Cosmic Rays (North Holland, Amsterdam, 1990).Google Scholar
  22. 21.
    B. Wundheiler et al. (Auger Collab.), PoS (ICRC2015) 324 (2015); arXiv:1509.03732.Google Scholar
  23. 22.
    A. Aab et al. (Auger Collab.), arXiv:1604.03637.Google Scholar
  24. 23.
    R. U. Abbasi et al. (TA Collab.), Astrophys. J. 858, 76 (2018).ADSCrossRefGoogle Scholar
  25. 24.
    A. A. Abdo et al. (Fermi-LAT Collab.), Phys. Rev. Lett. 104, 101101 (2015).ADSCrossRefGoogle Scholar
  26. 25.
    R. Y. Liu, A. M. Taylor, X. Y. Wang, and F. Aharonian, Phys. Rev. D 94, 043008 (2016).ADSCrossRefGoogle Scholar
  27. 26.
    E. Gavish and D. Eichler, Astrophys. J. 822, 56 (2016).ADSCrossRefGoogle Scholar
  28. 27.
    V. Berezinsky, A. Gazizov, and O. Kalashev, Astropart. Phys. 84, 52 (2016).ADSCrossRefGoogle Scholar
  29. 28.
    I. Valino et al. (Auger Collab.), PoS (ICRC2015) 271 (2015); arXiv:1509.03732.Google Scholar
  30. 29.
    D. Ivanov et al. (TA Collab.), PoS (ICRC2015) 349 (2015).Google Scholar
  31. 30.
    F. Fenu et al. (Auger Collab.), PoS (ICRC2017) 486 (2017); arXiv:1708.06592.Google Scholar
  32. 31.
    J. Matthews et al. (TA Collab.), PoS (ICRC2017) 1096 (2017).Google Scholar
  33. 32.
    V. Verzi et al. (Auger Collab.), in Proceedings of the ICRC 2013, arXiv:1307.5059.Google Scholar
  34. 33.
    V. Verzi, PoS(ICRC2015) 015 (2016).Google Scholar
  35. 34.
    R. Aloisio, V. Berezinsky, and P. Blasi, J. Cosmol. Astropart. Phys. 10, 020 (2014).Google Scholar
  36. 35.
    E. J. Ahn et al., Phys. Rev. D 80, 094003 (2009).ADSCrossRefGoogle Scholar
  37. 36.
    G. Hinshaw et al. (WMAP Collab.), Astrophys. J. Suppl. Ser. 180, 225 (2009).ADSCrossRefGoogle Scholar
  38. 37.
    R. Adam et al. (Planck Collab.), Astron. Astrophys. 596, A108 (2016).CrossRefGoogle Scholar
  39. 38.
    A. Songaila, Astrophys. J. 561, L153 (2001).ADSCrossRefGoogle Scholar
  40. 39.
    R. Y. Liu, A. M. Taylor, X. Y. Wang, and F. A. Aharonian, Phys. Rev. D 94, 043008 (2016); arXiv:1603.03223.Google Scholar
  41. 40.
    F. W. Stecker, M. M. Malkan, and S. Scully, Astrophys. J. 648, 774 (2006).ADSCrossRefGoogle Scholar
  42. 41.
    P. Younk and M. Risse, Astropart. Phys. 35, 807 (2012).ADSCrossRefGoogle Scholar
  43. 42.
    A. Aab et al. (Auger Collab.), Phys. Lett. B 708, 288 (2016).ADSCrossRefGoogle Scholar
  44. 43.
    A. Aab et al. (for Auger Collab.), Phys. Rev. Lett. 117, 192001 (2016).ADSCrossRefGoogle Scholar
  45. 44.
    R. Takcisin et al., JPS Conf. Proc. 19, 011045 (2018).Google Scholar
  46. 45.
    S. Ostapchenko, in Proceedings of the 25th European Cosmic Ray Symposia ECRS 2016, arXiv:1612.09461.Google Scholar

Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.Gran Sasso Science InstituteL’AquilaItaly
  2. 2.INFN—Laboratori Nazionali Gran SassoAssergi (AQ)Italy

Personalised recommendations