Measurement of the Cosmic‐Ray Energy Spectrum and Composition from 10<sup>17</sup>to 10<sup>18.3</sup>eV Using a Hybrid Technique

Abu‐Zayyad, T.; Belov, K.; Bird, D. J.; Boyer, J.; Cao, Zhen; Catanese, M.; Chen, G. F.; Clay, R. W.; Covault, C. E.; Dai, H. Y.; Dawson, B. R.; Elbert, J. W.; Fick, B.; Fortson, L.; Fowler, J. W.; Gibbs, K.; Glasmacher, M. A. K.; Green, K. D.; Ho, Y.; Huang, Audrey; Jui, C.; Kidd, M.; Kieda, D. B.; Knapp, B.; Ko, S.; Larsen, C. G.; Lee, W.; Loh, E. C.; Mannel, E.; Matthews, John; Matthews, J. N.; Newport, B. J.; Nitz, D.; Ong, R. A.; Simpson, K. M.; Smith, J. D.; Sinclair, D.; Sokolsky, P.; Sommers, P.; Song, C.; Tang, J. K. K.; Thomas, S. B.; Velde, J. C. van der; Wiencke, L.; Wilkinson, Christopher; Yoshida, Shigeru; Zhang, X. Z.

doi:10.1086/322240

Cited by 196 publications

(139 citation statements)

References 22 publications

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“…However recent HiRes data indicate that this change in the cosmic ray composition occurs at a much lower energy of ∼ 10 17.6 eV [63], where the spectral slope steepens from E −3 to E −3.3 [64]. This "second knee" in the spectrum, recognised originally in AGASA data [65], can be explained [66] as arising from energy losses of extragalactic protons over cosmic distances due to e + e − pairproduction on the cosmic microwave background (CMB).…”

Section: The Cosmic Neutrino Flux From Extragalctic Sourcesmentioning

confidence: 99%

High energy neutrinos from astrophysical accelerators of cosmic ray nuclei

Anchordoqui

Hooper

Sarkar

et al. 2008

Astroparticle Physics

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Ongoing experimental efforts to detect cosmic sources of high energy neutrinos are guided by the expectation that astrophysical accelerators of cosmic ray protons would also generate neutrinos through interactions with ambient matter and/or photons. However there will be a reduction in the predicted neutrino flux if cosmic ray sources accelerate not only protons but also significant numbers of heavier nuclei, as is indicated by recent air shower data. We consider plausible extragalactic sources such as active galactic nuclei, gamma-ray bursts and starburst galaxies and demand consistency with the observed cosmic ray composition and energy spectrum at Earth after allowing for propagation through intergalactic radiation fields. This allows us to calculate the expected neutrino fluxes from the sources, normalized to the observed cosmic ray spectrum. We find that the likely signals are still within reach of next generation neutrino telescopes such as IceCube.PACS numbers: 95.85. Ry, 98.70.Rz, 98.54.Cm, 98.54.Ep

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Section: The Cosmic Neutrino Flux From Extragalctic Sourcesmentioning

confidence: 99%

High energy neutrinos from astrophysical accelerators of cosmic ray nuclei

Anchordoqui

Hooper

Sarkar

et al. 2008

Astroparticle Physics

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“…3 shows the elongation rate from the stereo data [11]. Also included in this figure are lower energy data from an earlier hybrid experiment [12]. Above 1 EeV, the data is consistent with a light, mainly protonic composition.…”

Section: Cosmic Ray Compositionmentioning

confidence: 68%

Recent Results from the High Resolution Fly's Eye Experiment

Sokolsky

2008

Nuclear Physics B - Proceedings Supplements

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The HiRes experiment has now completed data taking. We describe the experiment, the detector and atmospheric calibration and studies to improve precision of knowledge of air-fluorescence efficiency. The current results on the monocular and stereo spectrum and stereo-based composition measurements are summarized. Possible correlation of stereo data event directions with a subset of Bl-Lac objects is discussed.

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“…Panel a of Figure 12) shows the HiRes-II spectrum in comparison with two previous fluorescence experiments, Fly's Eye [4] (stereo) and HiRes-MIA [23].…”

Section: The Uhe Cosmic Ray Spectrummentioning

confidence: 92%

Monocular measurement of the spectrum of UHE cosmic rays by the FADC detector of the HiRes experiment

Abbasi¹,

Abu‐Zayyad²,

Amman³

et al. 2005

Astroparticle Physics

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102

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We have measured the spectrum of UHE cosmic rays using the Flash ADC (FADC) detector (called HiRes-II) of the High Resolution Fly's Eye experiment running in monocular mode. We describe in detail the data analysis, development of the Monte Carlo simulation program, and results. We also describe the results of the HiRes-I detector. We present our measured spectra and compare them with a model incorporating galactic and extragalactic cosmic rays. Our combined spectra provide strong evidence for the existence of the spectral feature known as the "ankle."

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Measurement of the Cosmic‐Ray Energy Spectrum and Composition from 10¹⁷to 10^18.3eV Using a Hybrid Technique

Cited by 196 publications

References 22 publications

High energy neutrinos from astrophysical accelerators of cosmic ray nuclei

High energy neutrinos from astrophysical accelerators of cosmic ray nuclei

Recent Results from the High Resolution Fly's Eye Experiment

Monocular measurement of the spectrum of UHE cosmic rays by the FADC detector of the HiRes experiment

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Measurement of the Cosmic‐Ray Energy Spectrum and Composition from 1017to 1018.3eV Using a Hybrid Technique

Cited by 196 publications

References 22 publications

High energy neutrinos from astrophysical accelerators of cosmic ray nuclei

High energy neutrinos from astrophysical accelerators of cosmic ray nuclei

Recent Results from the High Resolution Fly's Eye Experiment

Monocular measurement of the spectrum of UHE cosmic rays by the FADC detector of the HiRes experiment

Contact Info

Product

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Measurement of the Cosmic‐Ray Energy Spectrum and Composition from 10¹⁷to 10^18.3eV Using a Hybrid Technique