New constraints from haverah park data on the photon and iron fluxes of ultrahigh-energy cosmic rays

Using data from inclined events ( 60 degrees <straight theta<80 degrees ) recorded by the Haverah Park shower detector, we show that above 10(19) eV less than 41% ( 54%) of the primary cosmic rays can be photons (iron nuclei) at the 95% confidence level. Above 4x10(19) eV less than 65% of the...

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Bibliographic Details
Published inPhysical review letters Vol. 85; no. 11; p. 2244
Main Authors Ave, M, Hinton, JA, Vazquez, RA, Watson, AA, Zas, E
Format Journal Article
LanguageEnglish
Published United States 11.09.2000
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Summary:Using data from inclined events ( 60 degrees <straight theta<80 degrees ) recorded by the Haverah Park shower detector, we show that above 10(19) eV less than 41% ( 54%) of the primary cosmic rays can be photons (iron nuclei) at the 95% confidence level. Above 4x10(19) eV less than 65% of the cosmic rays can be photonic at the same confidence level. These limits place important constraints on some models of the origin of ultrahigh-energy cosmic rays. Details of two new events above 10(20) eV are reported.
ISSN:1079-7114
DOI:10.1103/physrevlett.85.2244