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
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
相关论文
共 36 条
[1]  
AUDOUZE J, 1985, PRODUCTION DISTRIBUT, P373
[2]   PARTICLE-ACCELERATION AT ASTROPHYSICAL SHOCKS - A THEORY OF COSMIC-RAY ORIGIN [J].
BLANDFORD, R ;
EICHLER, D .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1987, 154 (01) :1-75
[3]  
Cameron A., 1982, ESSAYS NUCL ASTROPHY, P23
[4]   ON THE STELLAR ORIGIN OF THE NE-22 EXCESS IN COSMIC-RAYS [J].
CASSE, M ;
PAUL, JA .
ASTROPHYSICAL JOURNAL, 1982, 258 (02) :860-863
[5]  
CHRISTIAN ER, 1987, 20TH P INT COSM RAY, V2, P382
[6]   INTERSTELLAR C-12/C-13 RATIO REVISITED [J].
CRANE, P ;
HEGYI, DJ ;
LAMBERT, DL .
ASTROPHYSICAL JOURNAL, 1991, 378 (01) :181-185
[7]   SOLAR MODULATION OF GALACTIC COSMIC RAYS .2. [J].
FISK, LA .
JOURNAL OF GEOPHYSICAL RESEARCH, 1971, 76 (01) :221-+
[8]   THE ABUNDANCE OF N-14 AT THE COSMIC-RAY SOURCE - A STUDY USING NEW FRAGMENTATION CROSS-SECTIONS [J].
GUPTA, M ;
WEBBER, WR .
ASTROPHYSICAL JOURNAL, 1989, 340 (02) :1124-1134
[9]   THE C-12/C-13 ISOTOPE RATIO OF THE INTERSTELLAR-MEDIUM IN THE NEIGHBORHOOD OF THE SUN [J].
HAWKINS, I ;
JURA, M .
ASTROPHYSICAL JOURNAL, 1987, 317 (02) :926-950
[10]  
KROMBEL KE, 1988, APJ, V328, P910