12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room A(101/102)

[CRD070] Constraints on Galactic Cosmic-Ray Origins from Elemental Composition Measurements

Speakers

  • W.R. BINNS

Primary authors

Co-authors

Description

We present measurements of the abundances of ultra-heavy (Z>29) cosmic rays made by the CRIS instrument on NASA’s ACE satellite. The data set corresponds to 6413 days of data collection beginning December 4, 1997 through May 31, 2016. The charge resolution that we obtain shows essentially complete separation of charges in the Z>28 range. We detected more than 1000 events over the charge range of Z=30-40. Our measurements show that the ordering of refractory and volatile elements with atomic mass is greatly improved when compared to a mix of massive star outflow and SN ejecta with normal ISM, rather than pure ISM. Additionally, the refractory and volatile elements have similar slopes and refractory elements are preferentially accelerated by a factor of ~4. The measured abundances support a model in which cosmic ray source material is a mix of material from massive star outflow and ejecta and normal ISM. This research is supported by NASA under Grant # NNX13AH66G