Table 3
Isotopic Abundance Ratios Measured with the
High Energy Cosmic Ray Experiment on ISEE-3

 Ratio     Value Uncertainty      Ref.

 C13/C12   0.070 (+0.006,-0.006)   a

 O17/O16   0.019 (+0.004,-0.003)   b
 O18/O16   0.019 (+0.002,-0.002)   b

Ne21/Ne20  0.25  (+0.05,-0.04)     b
Ne22/Ne20  0.67  (+0.10,-0.07)     b

Mg25/Mg24  0.28  (+0.04,-0.03)     b
Mg26/Mg24  0.30  (+0.04,-0.03)     b

Al26/Al27  0.036 (+0.037,-0.022)   c

Si29/Si28  0.109 (+0.024,-0.014)   a
Si30/Si28  0.084 (+0.020,-0.014)   a

Ti44/Ti48  0.041 (+0.036,-0.023)   d
Ti46/Ti48  0.64  (+0.17,-0.16)     d
Ti47/Ti48  0.73  (+0.26,-0.23)     d
Ti49/Ti48 <0.19                    d
Ti50/Ti48  0.168 (+0.076,-0.059)   d

 V49/V50   1.09  (+0.48,-0.34)     d
 V51/V50   0.70  (+0.42,-0.27)     d

Cr50/Cr52  0.45  (+0.14,-0.11)     d
Cr51/Cr52  0.48  (+0.18,-0.15)     d
Cr53/Cr52  0.194 (+0.108,-0.084)   d
Cr54/Cr52 <0.12                    d

Mn54/Mn53 <0.25                    d
Mn55/Mn53  1.28  (+0.32,-0.25)     d

Fe54/Fe56  0.084 (+0.017,-0.015)   d
Fe55/Fe56 <0.078                   d
Fe57/Fe56 <0.089                   d
Fe58/Fe56 <0.036                   d

Co59/Co57  2.2   (+2.1,-1.4)       d

Ni59/Ni58 <0.58                    d
Ni60/Ni58  1.10  (+0.50,-0.35)     d
Ni61/Ni58 <0.19                    d
Ni62/Ni58 <0.28                    d

References

 a "High Resolution Observations of the Isotopic Composition of
   Carbon and Silicon in the Galactic Cosmic Rays", M. E.  Wiedenbeck
   and D. E.  Greiner, Ap. J. (Letters), 247, L119 (1981).
 b "Isotopic Anomalies in the Galactic Cosmic-Ray Source", M. E.
   Wiedenbeck and D. E. Greiner, Phys. Rev. Letters, 46, 682
   (1981).
 c "The Abundance of the Radioactive Isotope $^{26$Al in Galactic
   Cosmic Rays", M. E. Wiedenbeck, 18th Internat. Cosmic Ray Conf.
   (Bangalore), 9, 147 (1983).
 d "The Elemental and Isotopic Composition of Galactic Cosmic-Ray
   Nuclei from Scandium through Nickel", R. A. Leske, Ap. J., 405,
   567 (1993).