Isotopic composition of primary cosmic-ray nitrogen and oxygen with consequences for source models

1979 ◽  
Vol 63 (1) ◽  
pp. 215-236 ◽  
Author(s):  
L. Jacobsson ◽  
G. J�nsson ◽  
K. Kristiansson
Keyword(s):  
Isotopic Composition ◽  
Cosmic Ray ◽  
Source Models

Nucleosynthesis in Wolf-Rayet stars and galactic cosmic-ray isotopic composition

1984 ◽  
Vol 4 (2-3) ◽  
pp. 109-114 ◽  
Author(s):  
N. Prantzos
Keyword(s):  
Isotopic Composition ◽  
Cosmic Ray ◽  
Galactic Cosmic Ray

The Isotopic Composition of Galactic Cosmic-Ray Elements from Carbon to Silicon: The Combined Release and Radiation Effects Satellite Investigation

1996 ◽  
Vol 466 ◽  
pp. 457 ◽  
Author(s):  
M. A. Duvernois ◽  
M. Garcia-Munoz ◽  
K. R. Pyle ◽  
J. A. Simpson ◽  
M. R. Thayer
Keyword(s):  
Isotopic Composition ◽  
Radiation Effects ◽  
Cosmic Ray ◽  
Galactic Cosmic Ray

Experiments to study cosmic ray isotopic composition up to 40Zr

1990 ◽  
Author(s):  
Barrett Milliken
Keyword(s):  
Isotopic Composition ◽  
Cosmic Ray

Isotopic Composition of Cosmic-Ray Nitrogen at 1.5 GeV/amu

1975 ◽  
Vol 35 (9) ◽  
pp. 601-604 ◽  
Author(s):  
Robert Dwyer ◽  
Peter Meyer
Keyword(s):  
Isotopic Composition ◽  
Cosmic Ray

The cosmic ray boron and carbon isotopic composition measured in nuclear emulsions

1979 ◽  
Vol 291 (4) ◽  
pp. 383-390 ◽  
Author(s):  
C. Bjarle ◽  
N. -Y. Herrstr�m ◽  
G. J�nsson ◽  
K. Kristiansson
Keyword(s):  
Isotopic Composition ◽  
Carbon Isotopic Composition ◽  
Cosmic Ray ◽  
Nuclear Emulsions ◽  
Carbon Isotopic

A method to determine the isotopic composition of cosmic ray carbon

1970 ◽  
Vol 84 (2) ◽  
pp. 282-288 ◽  
Author(s):  
G. Jönsson ◽  
K. Kristiansson ◽  
L. Malmqvist
Keyword(s):  
Isotopic Composition ◽  
Cosmic Ray

Über den Helium- und Neongehalt von Steinmeteoriten und deren radiogene und kosmogene Alter

1962 ◽  
Vol 17 (12) ◽  
pp. 1092-1102 ◽  
Author(s):  
H. Hintenberger ◽  
H. König ◽  
H. Wanke
Keyword(s):  
Neutron Activation ◽  
Isotopic Composition ◽  
Total Content ◽  
Cosmic Ray ◽  
Decay Rates ◽  
Chemical Compositions ◽  
Diffusion Loss ◽  
Helium 3 ◽  
Exposure Ages ◽  
Cosmic Ray Exposure Ages

The total content as well as the isotopic composition of helium and neon of 19 chondrites and 5 achondrites have been determined. A description of the analytical method is given. Large variations of the ratios 3He/21Ne were observed and it is shown that these variations cannot be explained by differences in the chemical compositions of the meteorites only.Radiogenic helium ages and cosmic ray exposure ages have been calculated. The calculation of the helium ages was mainly based on uranium determinations by means of the xenon-method previously developed in this laboratory. The radiogenic helium ages range from 0.42 · 109 to 4.5 · 109 years. The values obtained for the helium ages are compared with the figures for the potassium-argon ages formerly derived by a neutron activation method newly developed and of those stated in the literature. It turns out that in most cases the radiogenic helium ages are lower, sometimes considerably lower than the potassium-argon ages indicating diffusion loss of helium and certainly in smaller quantities also of argon.Using tritium and sodium 22 decay rates from the literature for the calculations of the production rates for helium 3 and neon 22 cosmic ray exposure ages for all the meteorites analysed were obtained. These exposure ages vary between 0.3 ·106 and 29·106 years. No correlation between radiogenic ages and cosmic ray exposure ages and no grouping of the exposure ages have been found.

scholarly journals The isotopic composition of galactic cosmic-ray iron nuclei

1980 ◽  
Vol 236 ◽  
pp. L121 ◽  
Author(s):  
R. A. Mewaldt ◽  
J. D. Spalding ◽  
E. C. Stone ◽  
R. E. Vogt
Keyword(s):  
Isotopic Composition ◽  
Cosmic Ray ◽  
Galactic Cosmic Ray
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