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IJPAP Vol.42(07) [July 2004] >


Title: Charge spectrum of ultra heavy cosmic ray ions (Z=68-96) measured onboard long duration exposure facility
Authors: Batra, V
Dutta, A
Biswas, S
Keywords: Ultra heavy nuclei
Galactic cosmic rays-abundance
Nucleosynthesis
Anomalons
Issue Date: Jul-2004
Publisher: CSIR
IPC CodeG01T 1/00
Abstract: The results of the abundance of relativistic ultra heavy (UH) nuclei with charge Z > 65 from an analysis of detectors exposed in space by Ultra Heavy Cosmic Ray Experiment (UHCRE) conducted onboard NASA's Long Duration Exposure Facility (LDEF) are presented. A total of 72 events including two actinides (88 ≤ Z ≤ 100) have been identified from the scanning of ~0.21m2 detector area. A peak at = 78 and a smaller peak around = 85 could be seen. The charge fragmentation of the cosmic ray ions has also been seen within the detector stack. The detailed analysis of charge spectrum for the elements in the charge region, Z = 65-96, is presented. An enhancement of r-process elements relative to solar system is observed. The results suggest a mixed source of rapid (r) and slow (s) process nuclei with Z > 65 for cosmic rays in space.
Page(s): 479-484
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(07) [July 2004]

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