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Insights into the Galactic Cosmic-ray Source from the TIGER ExperimentWe report results from 50 days of data accumulated in two Antarctic flights of the Trans-Iron Galactic Element Recorder (TIGER). With a detector system composed of scintillators, Cherenkov detectors, and scintillating optical fibers, TIGER has a geometrical acceptance of 1.7 sq m sr and a charge resolution of 0.23 cu at Iron. TIGER has obtained abundance measurements of some of the rare galactic cosmic rays heavier than iron, including Zn, Ga, Ge, Se, and Sr, as well as the more abundant lighter elements (down to Si). The heavy elements have long been recognized as important probes of the nature of the galactic cosmic-ray source and accelerator. After accounting for fragmentation of cosmic-ray nuclei as they propagate through the Galaxy and the atmosphere above the detector system, the TIGER source abundances are consistent with a source that is a mixture of about 20% ejecta from massive stars and 80% interstellar medium with solar system composition. This result supports a model of cosmic-ray origin in OB associations previously inferred from ACE-CRIS data of more abundant lighter elements. These TIGER data also support a cosmic-ray acceleration model in which elements present in interstellar grains are accelerated preferentially compared with those found in interstellar gas.
Document ID
20090033101
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Link, Jason T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Barbier, L. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Binns, W. R. (Washington Univ. Saint Louis, MO, United States)
Christian, E. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cummings, J. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Geier, S. (California Inst. of Tech. Pasadena, CA, United States)
Israel, M. H. (Washington Univ. Saint Louis, MO, United States)
Lodders, K. (Washington Univ. Saint Louis, MO, United States)
Mewaldt,R. A. (California Inst. of Tech. Pasadena, CA, United States)
Mitchell, J. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
deNolfo, G. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rauch, B. F. (Washington Univ. Saint Louis, MO, United States)
Schindler, S. M. (California Inst. of Tech. Pasadena, CA, United States)
Scott, L. M. (Washington Univ. Saint Louis, MO, United States)
Streitmatter, R. E. (Washington Univ. Saint Louis, MO, United States)
Stone, E. C. (California Inst. of Tech. Pasadena, CA, United States)
Waddington, C. J. (Minnesota Univ. Minneapolis, MN, United States)
Wiedenbeck, M. E. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
July 7, 2009
Subject Category
Astrophysics
Meeting Information
Meeting: 31st International Cosmic Ray Conference/International Union of Pure and Applied Physics (IUPAP)
Location: Lodz
Country: Poland
Start Date: July 7, 2009
End Date: July 15, 2009
Funding Number(s)
CONTRACT_GRANT: NSF AST-0807356
CONTRACT_GRANT: NNG06EO90A
CONTRACT_GRANT: NNG05WC21G
CONTRACT_GRANT: NNG05WC04G
Distribution Limits
Public
Copyright
Public Use Permitted.

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