Elemental abundances in the local cosmic rays at high energies

Swordy, S. P.; L’Heureux, J.; Meyer, P.; Müller, D.

doi:10.1086/172235

Cited by 49 publications

(24 citation statements)

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“…(7), and normalized it so that the coefficient 10 47 equals the number of iron-iron collisions at a center-of-mass energy exceeding 100 GeV/nucleon. The abundance of iron in cosmic rays has now been measured up to energies of order 2 TeV/nucleon (Swordy et al, 1993) and agrees with the estimate used by Hut and Rees. This result translates into a bound of 2ϫ10 Ϫ36 on p, the probability that (in this case) an iron-iron collision at RHIC energies would trigger a transition to a different vacuum state.…”

Section: Decay Of the False Vacuumsupporting

confidence: 86%

“…Swordy et al (1993) found this behavior for oxygen, magnesium, and silicon as well as hydrogen, helium, and iron. The same power law is observed at high energies where data are dominated by hydrogen (Wiebel-Sooth and Biermann, 1998).…”

Section: Heavy Nuclei In Cosmic Raysmentioning

confidence: 73%

“…More extensive measurements have been made of the flux of nuclei in the iron-nickel (Z ϭ26-28) group and lighter. Data on iron are available up to energies of order 2 TeV/nucleon (Swordy et al, 1993). However, we know of no direct measurements of the flux of nuclei heavier than the iron-nickel group at energies above 10 GeV/nucleon.…”

Section: Heavy Nuclei In Cosmic Raysmentioning

confidence: 99%

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Review of speculative “disaster scenarios” at RHIC

et al. 2000

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This paper discusses speculative disaster scenarios inspired by hypothetical new fundamental processes that might occur in high-energy relativistic heavy-ion collisions. The authors estimate the parameters relevant to black-hole production and find that they are absurdly small. They show that other accelerator and (especially) cosmic-ray environments have already provided far more auspicious opportunities for transition to a new vacuum state, so that existing observations provide stringent bounds. The possibility of producing a dangerous strangelet is discussed in most detail. The authors argue that four separate requirements are necessary for this to occur: existence of large stable strangelets, metastability of intermediate size strangelets, negative charge for strangelets along the stability line, and production of intermediate size strangelets in the heavy ion environment. Both theoretical and experimental reasons why each of these appears unlikely are discussed. In particular, the authors know of no plausible suggestion for why the third or especially the fourth might be true. Given minimal physical assumptions, the continued existence of the Moon, in the form we know it, despite billions of years of cosmic-ray exposure, provides powerful empirical evidence against the possibility of dangerous strangelet production. CONTENTS

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Section: Decay Of the False Vacuumsupporting

confidence: 86%

Section: Heavy Nuclei In Cosmic Raysmentioning

confidence: 73%

Section: Heavy Nuclei In Cosmic Raysmentioning

confidence: 99%

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Review of speculative “disaster scenarios” at RHIC

et al. 2000

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“…The model then predicts a much harder spectrum at the source, approximately cxE-'.15. At least up to energies around 1 TeV/nucleon, this seems to be very well in agreement with measured data (12), perhaps with ,E-2.75 t" the exception of the element silicon which may have a steeper spectrum (2,9). This power-law spectrum for the source region agrees well with predictions from supernova-shock acceleration models and, in fact, may be taken as strong evidence for the validity of such models.…”

Section: Composition Of the Cosmic Ray Sourcesupporting

confidence: 86%

The Cosmic Ray Composition Towards The Knee: Experimental Status And Implications

Müller¹,

Swordy²

1995

Annals of the New York Academy of Sciences

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“…The JACEE determination (Asakimori et al 1995) is a compilation of data from 12 flights. CRN (Swordy et al 1993) was conducted on the Space Shuttle. …”

Section: Resultsmentioning

confidence: 99%

A measurement of the flux of cosmic ray iron at 5×1013 eV

Clem¹,

Droege²,

Evenson³

et al. 2002

Astroparticle Physics

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We present results from the initial flight of our Balloon Air CHerenkov (BACH) payload. BACH detects air Cherenkov radiation from cosmic ray nuclei as coincident flashes in two optical modules. The flight (dubbed PDQ BACH) took place on April 22, 1998 from Ft. Sumner, New Mexico. During an exposure of 2.75 hours, with a typical threshold energy for iron nuclei of 2.2×10 13 eV, we observed several events cleanly identifiable as iron group nuclei. Analysis of the data yields a new flux measurement that is fully consistent with that reported by other investigations.

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Elemental abundances in the local cosmic rays at high energies

Cited by 49 publications

References 0 publications

Review of speculative “disaster scenarios” at RHIC

Review of speculative “disaster scenarios” at RHIC

The Cosmic Ray Composition Towards The Knee: Experimental Status And Implications

A measurement of the flux of cosmic ray iron at 5×1013 eV

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