article · Physical Review Letters · 2008

Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>

J. Abraham, P. Abreu, M. Aglietta, C. Aguirre, D. Allard, I. Allekotte, J. Allen, P. Allison, Jaime Álvarez-Muñiz, M. Ambrosio, Luis A. Anchordoqui, S. Andringa, A. Anzalone, C. Aramo, S. Argirò, K. Arisaka, E. Armengaud, F. Arneodo, F. Arqueros, T. Asch, H. Asorey, P. Assis, B.S. Atulugama, J. Aublin, M. Ave, G. Ávila, T. Bäcker, D. Badagnani, A.F. Barbosa, David Barnhill, S. L. C. Barroso, B. M. Baughman, P. Bauleo, J. J. Beatty, T. Beau, B. R. Becker, K. Becker, Jose A. Bellido, S. BenZvi, C. Bérat, Thaisa Storchi‐Bergmann, P. Bernardini, X. Bertou, Peter L. Biermann, P. Billoir, O. Blanch, F. Blanco, Pasquale Blasi, C. Bleve, H. Blümer and 408 more

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Abstract

The energy spectrum of cosmic rays above 2.5 x 10;{18} eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the particle flux, J proportional, variantE;{-gamma}, at energies between 4 x 10;{18} eV and 4 x 10;{19} eV is 2.69+/-0.02(stat)+/-0.06(syst), steepening to 4.2+/-0.4(stat)+/-0.06(syst) at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz'min.

Cite this paper

APA 7

Abraham, J., Abreu, P., Aglietta, M., Aguirre, C., Allard, D., Allekotte, I., Allen, J., Allison, P., Álvarez-Muñiz, J., Ambrosio, M., Anchordoqui, L. A., Andringa, S., Anzalone, A., Aramo, C., Argirò, S., Arisaka, K., Armengaud, E., Arneodo, F., Arqueros, F., . . . Blümer, H. (2008). Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>. Physical Review Letters, 101(6), 061101. https://doi.org/10.1103/physrevlett.101.061101

MLA 9

Abraham, J., et al. “Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>.” Physical Review Letters, vol. 101, no. 6, 2008, p. 061101, https://doi.org/10.1103/physrevlett.101.061101.

Chicago

Abraham, J., P. Abreu, M. Aglietta, C. Aguirre, D. Allard, I. Allekotte, J. Allen, et al. 2008. “Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>.” Physical Review Letters 101 (6): 061101. https://doi.org/10.1103/physrevlett.101.061101.

Harvard

Abraham, J. et al. (2008) ‘Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>’, Physical Review Letters, 101(6), p. 061101. Available at: https://doi.org/10.1103/physrevlett.101.061101.

BibTeX

@article{abraham2008observation,
  title = {{Observation of the Suppression of the Flux of Cosmic Rays above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mn>19</mml:mn></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:math>}},
  author = {Abraham, J. and Abreu, P. and Aglietta, M. and Aguirre, C. and Allard, D. and Allekotte, I. and Allen, J. and Allison, P. and Álvarez-Muñiz, Jaime and Ambrosio, M. and Anchordoqui, Luis A. and Andringa, S. and Anzalone, A. and Aramo, C. and Argirò, S. and Arisaka, K. and Armengaud, E. and Arneodo, F. and Arqueros, F. and Asch, T. and Asorey, H. and Assis, P. and Atulugama, B.S. and Aublin, J. and Ave, M. and Ávila, G. and Bäcker, T. and Badagnani, D. and Barbosa, A.F. and Barnhill, David and Barroso, S. L. C. and Baughman, B. M. and Bauleo, P. and Beatty, J. J. and Beau, T. and Becker, B. R. and Becker, K. and Bellido, Jose A. and BenZvi, S. and Bérat, C. and Storchi‐Bergmann, Thaisa and Bernardini, P. and Bertou, X. and Biermann, Peter L. and Billoir, P. and Blanch, O. and Blanco, F. and Blasi, Pasquale and Bleve, C. and Blümer, H. and others},
  journal = {Physical Review Letters},
  volume = {101},
  number = {6},
  pages = {061101},
  year = {2008},
  doi = {10.1103/physrevlett.101.061101}
}

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