Cosmic ray source abundances and the acceleration of cosmic rays

George, Jimin; Wiedenbeck, M. E.; Barghouty, A. F.; Binns, W. R.; Christian, E. R.; Cummings, A. C.; Hink, P. L.; Klarmann, J.; Leske, R. A.; Lijowski, M.; Mewaldt, R. A.; Stone, E. C.; Rosenvinge, T. T. von; Yanasak, N. E.

doi:10.1063/1.1324355

Cited by 15 publications

(17 citation statements)

References 6 publications

(6 reference statements)

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“…The Na source abundance has been previously shown to be depleted at the 2a level relative to the solar-system abundance [15]. This depletion is consistent with that expected from volatility models.…”

Section: Introductionsupporting

confidence: 75%

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The phosphorus/sulfur abundance ratio as a test of galactic cosmic-ray source models

George¹,

Wiedenbeck²,

Binns³

et al. 2001

AIP Conference Proceedings

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Abstract. Galactic cosmic-ray (OCR) elemental abundances display a fractionation compared to solar-system values that appears ordered by atomic properties such as the first ionization potential (FIP) or condensation temperature (volatility). Determining which parameter controls the observed fractionation is crucial to distinguish between GCR origin models. The Cosmic-Ray Isotope Spectrometer (CRIS) instrument on board NASA's Advanced Composition Explorer (ACE) spacecraft can measure the abundances of several elements that break the general correlation between FIP and volatility (e.g., Na, P, K, Cu, Zn, Ga, and Ge). Phosphorus is a particularly interesting case as it is a refractory (high condensation temperature) element with a FIP value nearly identical to that of its semi-volatile neighbor, sulfur. Using a leaky-box galactic propagation model we find that the P/S and Na/Mg ratios in the GCR source favor volatility as the controlling parameter.

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Section: Introductionsupporting

confidence: 75%

“…Abundances in this region fall rapidly with increasing nuclear charge so there is little material to contribute to secondary production by fragmentation during transport. These source abundances are reliably determined and limited mainly by statistics [15]. Of these four, Cu and Ge favor volatility models.…”

Section: Introductionmentioning

confidence: 99%

The phosphorus/sulfur abundance ratio as a test of galactic cosmic-ray source models

George¹,

Wiedenbeck²,

Binns³

et al. 2001

AIP Conference Proceedings

Self Cite

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show abstract

“…Elements with similar FIP but different condensation temperatures can help distinguish between models of the GCR source. For example, low Na/Mg, Ge/Fe, Cu/Fe ratios, or a high P/S ratio in the GCR source compared to the solar-system abundances would favor models in which refractory cosmic rays are derived from ions sputtered from accelerated dust grains [78,79]. Source ratios of these elements that are consistent with the solarsystem values might reflect a FlP-based fractionation such as that observed in stellar coronae.…”

Section: Experimental Techniquementioning

confidence: 87%

“…Production of these isotopes requires an environment in which neutron capture rates dominate over nucleon decay. Observation of a high 78 Pt/…”

Section: Resultsmentioning

confidence: 99%

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Galactic abundances: Report of working group 3

Klecker¹,

Bothmer²,

Cummings³

et al. 2001

AIP Conference Proceedings

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Abstract. We summarize the various methods and their limitations and strengths to derive galactic abundances from in-situ and remote-sensing measurements, both from ground-based observation s and from instruments in space. Because galactic abundances evolve in time and sp ace it is important to obtain information with a variety of different methods covering different regions from the Very Local Insterstellar M edium (VLISM) to the distant galaxy, and different times throughout the evolution of the galaxy. We discuss the study of the present-day VLISM with neutral gas, pickup ions, and Anomalous Cosmic Rays, the study of the local interstellar medium (ISM) at distances < 1.5 kpc utilizing absorption line me asurements in H I clouds, and the study of galactic cosmic rays, sampling contemporary (~ 15 Myr) s ources in the local ISM within a few kiloparsec of the solar system. Solar system abundances, derived from solar abundances and meteorite studies are discussed in several other chapters o f this volume. They provide samples of matter from the ISM from the time of solar system format ion, about 4.5 Gyr ago. The evolution of galactic abundances on longer time scales is discussed in the context of nuclear synthesis in the various contributing stellar objects.

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The Ultra Heavy Elements in the Cosmic Radiation

Waddington

2007

The Composition of Matter

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Cosmic ray source abundances and the acceleration of cosmic rays

Cited by 15 publications

References 6 publications

The phosphorus/sulfur abundance ratio as a test of galactic cosmic-ray source models

The phosphorus/sulfur abundance ratio as a test of galactic cosmic-ray source models

Galactic abundances: Report of working group 3

The Ultra Heavy Elements in the Cosmic Radiation

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