The P, S, Ar, and Ca isotopic composition of the galactic cosmic ray source

R. C. Ogliore; E. C. Stone; R. A. Mewaldt; W. R. Binns; M. H. Israel; T. T. Vonrosenvinge; I. V. Moskalenko; M. E. Wiedenbeck

The P, S, Ar, and Ca isotopic composition of the galactic cosmic ray source

R. C. Ogliore
, E. C. Stone
, R. A. Mewaldt
, W. R. Binns
, M. H. Israel
, T. T. Vonrosenvinge
, I. V. Moskalenko
, M. E. Wiedenbeck

Department of Physics

Research output: Contribution to conference › Paper › peer-review

Abstract

Galactic cosmic ray (GCR) measurements of the phosphorus, sulfur, argon, and calcium isotopes made by the Cosmic Ray Isotope Spectrometer (CRIS) aboard NASA's Advanced Composition Explorer are reported over the energy range from ∼100 to ∼400 MeV/nucleon. The propagation of cosmic rays through the Galaxy and heliosphere is modeled to determine isotopic source abundance ratios ³¹P/³²S , ³⁴S/³²S , ³⁸Ar/³⁶Ar , and ³⁶Ar/⁴⁰Ca By deriving the GCR source abundance of argon (a noble gas) and calcium (a refractory), it is determined that material in grains is accelerated to GCR energies a factor of 6.4 more efficiently than gas-phase material in this charge range. With this information, the interstellar dust fraction of phosphorus and sulfur at the cosmic ray source is shown to be consistent with astronomical measurements of hot galactic environments.

Original language	English
Pages	125-128
Number of pages	4
State	Published - 2007
Event	30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico Duration: Jul 3 2007 → Jul 11 2007

Conference

Conference	30th International Cosmic Ray Conference, ICRC 2007
Country/Territory	Mexico
City	Merida, Yucatan
Period	07/3/07 → 07/11/07

Cite this

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title = "The P, S, Ar, and Ca isotopic composition of the galactic cosmic ray source",

abstract = "Galactic cosmic ray (GCR) measurements of the phosphorus, sulfur, argon, and calcium isotopes made by the Cosmic Ray Isotope Spectrometer (CRIS) aboard NASA's Advanced Composition Explorer are reported over the energy range from ∼100 to ∼400 MeV/nucleon. The propagation of cosmic rays through the Galaxy and heliosphere is modeled to determine isotopic source abundance ratios 31P/32S , 34S/32S , 38Ar/36Ar , and 36Ar/40Ca By deriving the GCR source abundance of argon (a noble gas) and calcium (a refractory), it is determined that material in grains is accelerated to GCR energies a factor of 6.4 more efficiently than gas-phase material in this charge range. With this information, the interstellar dust fraction of phosphorus and sulfur at the cosmic ray source is shown to be consistent with astronomical measurements of hot galactic environments.",

author = "Ogliore, \{R. C.\} and Stone, \{E. C.\} and Mewaldt, \{R. A.\} and Binns, \{W. R.\} and Israel, \{M. H.\} and Vonrosenvinge, \{T. T.\} and Moskalenko, \{I. V.\} and Wiedenbeck, \{M. E.\}",

year = "2007",

language = "English",

pages = "125--128",

note = "30th International Cosmic Ray Conference, ICRC 2007 ; Conference date: 03-07-2007 Through 11-07-2007",

}

TY - CONF

T1 - The P, S, Ar, and Ca isotopic composition of the galactic cosmic ray source

AU - Ogliore, R. C.

AU - Stone, E. C.

AU - Mewaldt, R. A.

AU - Binns, W. R.

AU - Israel, M. H.

AU - Vonrosenvinge, T. T.

AU - Moskalenko, I. V.

AU - Wiedenbeck, M. E.

PY - 2007

Y1 - 2007

N2 - Galactic cosmic ray (GCR) measurements of the phosphorus, sulfur, argon, and calcium isotopes made by the Cosmic Ray Isotope Spectrometer (CRIS) aboard NASA's Advanced Composition Explorer are reported over the energy range from ∼100 to ∼400 MeV/nucleon. The propagation of cosmic rays through the Galaxy and heliosphere is modeled to determine isotopic source abundance ratios 31P/32S , 34S/32S , 38Ar/36Ar , and 36Ar/40Ca By deriving the GCR source abundance of argon (a noble gas) and calcium (a refractory), it is determined that material in grains is accelerated to GCR energies a factor of 6.4 more efficiently than gas-phase material in this charge range. With this information, the interstellar dust fraction of phosphorus and sulfur at the cosmic ray source is shown to be consistent with astronomical measurements of hot galactic environments.

AB - Galactic cosmic ray (GCR) measurements of the phosphorus, sulfur, argon, and calcium isotopes made by the Cosmic Ray Isotope Spectrometer (CRIS) aboard NASA's Advanced Composition Explorer are reported over the energy range from ∼100 to ∼400 MeV/nucleon. The propagation of cosmic rays through the Galaxy and heliosphere is modeled to determine isotopic source abundance ratios 31P/32S , 34S/32S , 38Ar/36Ar , and 36Ar/40Ca By deriving the GCR source abundance of argon (a noble gas) and calcium (a refractory), it is determined that material in grains is accelerated to GCR energies a factor of 6.4 more efficiently than gas-phase material in this charge range. With this information, the interstellar dust fraction of phosphorus and sulfur at the cosmic ray source is shown to be consistent with astronomical measurements of hot galactic environments.

UR - https://www.scopus.com/pages/publications/84899519515

M3 - Paper

AN - SCOPUS:84899519515

SP - 125

EP - 128

T2 - 30th International Cosmic Ray Conference, ICRC 2007

Y2 - 3 July 2007 through 11 July 2007

ER -

The P, S, Ar, and Ca isotopic composition of the galactic cosmic ray source

Abstract

Conference

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