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KindShowingImportancePrizesTopicPierre Auger Observatory
The southern-hemisphere ultra-high-energy cosmic-ray observatory in Malargüe, Argentina, combining a surface detector array with fluorescence telescopes. Claims about its measurements, results, performance, and interpretation (spectrum, composition, anisotropy, photon and neutrino limits) belong here; results from other experiments do not.
Auger hybrid data are best described when hadronic model predictions are shifted to deeper shower maxima and larger ground-level hadronic signals
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Hadronic interaction modelsCosmic raysMuon excess in extensive air showersimportance · minorImportance 0.35, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Auger measurements show ground-level muon signals well above hadronic interaction model predictions
VerifiedThe evidence, examined directly, establishes the claim.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Muon excess in extensive air showersHadronic interaction modelsCosmic raysimportance · minorImportance 0.35, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Pierre Auger Observatory shower-maximum measurements indicate cosmic-ray composition becomes heavier above about 2×10^18 eV
SupportedThe evidence favors the claim, but the examination is incomplete or the evidence is indirect.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Cosmic raysUltra-high-energy cosmic-ray compositionimportance · minorImportance 0.35, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The muon excess inferred from Auger data depends on the assumed primary composition and model shower-maximum scale
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Muon excess in extensive air showersHadronic interaction modelsUltra-high-energy cosmic-ray compositionimportance · minorImportance 0.30, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
Shower-to-shower fluctuations of shower-maximum depth measured by the Pierre Auger Observatory decrease with energy above about 2×10^18 eV
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Cosmic raysUltra-high-energy cosmic-ray compositionimportance · settledImportance 0.20, from 0 to 1 · settled: uncontested, so low even when much depends on it. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
The mean shower-maximum depth measured by the Pierre Auger Observatory increases more slowly with energy above about 2×10^18 eV than expected for constant composition
UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Ultra-high-energy cosmic-ray compositionCosmic raysimportance · settledImportance 0.20, from 0 to 1 · settled: uncontested, so low even when much depends on it. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →
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