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

Ogliore, R. C. and Stone, E. C. and Mewaldt, R. A. and Binns, W. R. and Israel, M. H. and von Rosenvinge, T. T. and Moskalenko, I. V. and Wiedenbeck, M. E. (2007) The P, S, Ar, and Ca isotopic composition of the galactic cosmic ray source. In: Proceedings of the 30th International Cosmic Ray Conference. Vol.2. Universidad Nacional Autónoma de México , Merida, Yucatan, Mexico, pp. 125-128. http://resolver.caltech.edu/CaltechAUTHORS:20150501-113522940

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Abstract

Galactic cosmic ray (OCR) 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 aver 1he 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 ^(31)P/^(32)S, ^(34)S/^(32)S, ^(38)Ar/^(36)Ar, and ^(36)Ar/^(40)Ca. By deriving the OCR source abundance of argon (a noble gas) and calcium (a refractory), it is determined that material in grains is accelerated to OCR energies a factor of ~6.4 more efficiently than gas-phase material in this charge range. With this information the interstellar dust function of phosphorus and sulfur at the cosmic ray source is shown to be consistent with astronomical measurements of hot galactic environments.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://indico.nucleares.unam.mx/getFile.py/access?contribId=698&sessionId=8&resId=0&materialId=paper&confId=4OrganizationArticle
http://adsabs.harvard.edu/abs/2008ICRC....2..125OADSAbstract
Additional Information:Copyright Universidad Nacional Autónoma de México This work was supported by NASA at the California Institute of Technology (under grant NAG5-12929). I. V. M. thanks NASA APRA grant for partial support.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAG5-12929
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2008-23
Record Number:CaltechAUTHORS:20150501-113522940
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150501-113522940
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57155
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:02 Jun 2015 01:50
Last Modified:02 Jun 2015 01:50

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