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Table 8

Computed production ratios (PR) of Th vs. some stable r-process elements, observed abundance ratios, and age estimates.

Chrono. log (PR) Ref. CS 31082-001 Age CS 30315-029 Age
Pair log (Th/X) (Gyr) log (Th/X) (Gyr)
Th/La −0.60 S02 −0.36 −11.21 −0.39 −10.01
− 0.01 W07a − 0.36 + 16.35 − 0.39 + 17.55
+0.12 W07b −0.36 +22.42 −0.39 +23.62
Th/Ce −0.79 S02 −0.69 −4.67 −0.80 +0.25
+0.06 W07a −0.69 +35.03 −0.80 +39.94
−0.25 W07b −0.69 +20.55 −0.80 +25.47
Th/Pr −0.30 S02 −0.19 −5.14 −0.32 +1.03
+0.60 W07a −0.19 +36.89 −0.32 +43.06
+0.25 W07b −0.19 +20.55 −0.32 +26.71
Th/Nd −0.91 S02 −0.83 −3.74 −0.89 −0.86
−0.26 W07a −0.83 +26.62 −0.89 +29.50
−0.68 W07b −0.83 +7.01 −0.89 +9.88
Th/Sm −0.61 S02 −0.56 −1.87 −0.69 +4.20
+0.01 W07a −0.56 +26.62 −0.69 +32.69
− 0.27 W07b − 0.56 + 13.54 − 0.69 + 19.61
Th/Eu −0.32 C99 −0.26 −2.80 −0.21 −5.32
−0.29 C02 −0.26 −1.40 −0.21 −3.92
−0.33 S02 −0.26 −3.27 −0.21 −5.79
+ 0.05 W02 − 0.26 + 14.48 − 0.21 + 11.96
−0.37 K07 −0.26 −5.14 −0.21 −7.66
+0.49 W07a −0.26 +35.03 −0.21 +32.50
+ 0.07 W07b − 0.26 + 15.41 − 0.21 + 12.89
Th/Gd −0.81 S02 −0.77 −1.87 −0.60 −9.81
+0.42 W07a −0.77 +55.57 −0.60 +47.63
− 0.37 W07b − 0.77 + 18.68 − 0.60 + 10.74
Th/Tb −0.12 S02 +0.03 −7.01 −0.05 −3.27
+0.73 W07a +0.03 +32.69 −0.05 +36.43
+0.48 W07b +0.03 +21.02 −0.05 +24.75
Th/Dy −0.89 S02 −0.91 +0.93 −0.83 −2.80
−0.07 W07a −0.91 +39.23 −0.83 +35.49
−0.13 W07b −0.91 +36.43 −0.83 +32.69
Th/Er −0.68 S02 −0.68 0.00 −0.70 +0.93
−0.02 W07a −0.68 +30.82 −0.70 +31.76
−0.28 W07b −0.68 +18.68 −0.70 +19.61
Th/Tm +0.12 S02 +0.17 −2.34 +0.27 −6.77
+0.65 W07a +0.17 +22.42 +0.27 +17.98
+ 0.44 W07b + 0.17 + 12.61 + 0.27 + 8.17

Reference. S02: Schatz et al. (2002); W07: Wanajo (2007), (a) hot and (b) cold model; C99: Cowan et al. (1999); C02: Cowan et al. (2002); W02: Wanajo et al. (2002), with initial electron fraction Ye = 0.40; K07: Kratz et al. (2007).

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