Reaction rates for 146sm production in supernovae

Thomas Rauscher, Friedrich Karl Thielemann, Heinz Oberhummer

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Correlations of the142Nd/144Nd ratio with the Sm/Nd ratio in some meteorites have been previously explained by the a-decay of long-lived 146Sm. In order to account for these observations, a necessary production ratio for 146Sm/144Sm in the y-process of 0.1-0.7 was deduced. The ratio [148Gd(ϓ, n)147Gd]/[148Gd(ϓ, α)144Sm], which plays the dominant role in the production of 146Sm/144Sm, has been redetermined in the present Letter by improved statistical model calculations. Utilization of folding potentials for the a-channel reduce the (y, a) rate by a factor of 3, which would enhance the production ratios, previously predicted at the lower limit of the allowed range 0.1-0.7. However, additional improvements in the treatment of nuclear level densities also reduce the (y, n) rate by a factor of 0.4. Thus, in total the new cross section calculations result, at best, in only a modestly enhanced production ratio of 146Sm/144Sm.

Original languageEnglish
Pages (from-to)L37-L39
JournalThe Astrophysical Journal
Issue number1
Publication statusPublished - 20 Sept 1995
Externally publishedYes


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