Observation of the suppression of the flux of cosmic rays above 4x10(19) eV
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2008
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Resumo |
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 to E(-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. Comision Nacional de Energia Atomica Fundacion Antorchas Gobierno De La Provincia de Mendoza Municipalidad de Malargue NDM Holdings Valle Las Lenas Australian Research Council Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) Financiadora de Estudos e Projetos (FINEP) Fundacao de Amparo a Pesquisa do Estado de Rio de Janeiro (FAPERJ) Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Ministerio de Ciencia e Tecnologia (MCT), Brazil AVCR[AV0Z10100502] AVCR[AV0Z10100522] GAAV[KJB300100801] GACR Grant Agency of the Academy of Sciences of the Czech Republic [202/06/P006] Centre National de la Recherche Scientifique (CNRS) Conseil Regional Ile-de-France, De'partement Physique Nucleaire et Corpusculaire[PNC-IN2P3/CNRS] Departement Sciences de l'Univers (SDU-INSU/CNRS), France [MSMT-CR LA08016] [LC527] [1M06002] |
Identificador |
PHYSICAL REVIEW LETTERS, v.101, n.6, 2008 0031-9007 http://producao.usp.br/handle/BDPI/16036 10.1103/PhysRevLett.101.061101 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review Letters |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #EXTENSIVE AIR-SHOWERS #UPPER LIMIT #ENERGY #SPECTRUM #ARRAY #Physics, Multidisciplinary |
Tipo |
article original article publishedVersion |