THE ISOTOPIC COMPOSITION OF COSMIC-RAY-B, COSMIC-RAY-C, COSMIC-RAY-N, AND COSMIC-RAY-O - EVIDENCE FOR AN OVERABUNDANCE OF O-18

被引：22
|
作者：
GIBNER, PS [1 ]
MEWALDT, RA [1 ]
SCHINDLER, SM [1 ]
STONE, EC [1 ]
WEBBER, WR [1 ]
机构：
[1] NEW MEXICO STATE UNIV,DEPT ASTRON,LAS CRUCES,NM 88003
来源：
ASTROPHYSICAL JOURNAL | 1992年 / 391卷 / 02期
关键词：
COSMIC RAYS GALAXY; ABUNDANCES;
D O I：
10.1086/186405
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
New observations of galactic cosmic rays at higher energies (approximately 400-780 MeV nucleon-1) than obtained in previous direct mass measurements have resulted in determinations of the isotopic composition of B, C, N, and O. The derived cosmic-ray source abundances provide evidence for an enhancement of O-18/O-16 by a factor of 5.6 +/- 1.9 over the solar system value and give a C-13/C-12 ratio consistent with the solar system abundance ratio, but lower than some recent measurements of the local interstellar medium.
引用
收藏
页码：L89 / L92
页数：4
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