... disk

All references to the Galactic disk must be regarded, in this work, as references to the thin disk, unless otherwise specified.

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... ratios

In this paper we employ the following customary spectroscopic notations: absolute abundance $\log\varepsilon({\rm A})\equiv\log_{10}(N_{{\rm A}}/N_{{\rm H}})+12.0$, and abundance ratio ${\rm [A/B]}\equiv\log_{10}(N_{{\rm A}}/N_{{\rm B}})_{{\rm star}} -\log_{10}(N_{{\rm A}}/N_{{\rm B}})_{{\rm\scriptsize\hbox{$\odot$ }}}$, where  $N_{{\rm A}}$ and $N_{{\rm B}}$ are the abundances of elements A and B, respectively, in atoms cm^-3.

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... respectively)

Some of the works cited above show that there is no agreement for elements of the first r-process peak (${Z}\le55$). This hints at the existence of two different sites of r-process nucleosynthesis: one that produces low mass elements (first peak), and one that produces high mass elements (second and third peaks, and actinides). The non-universality of low mass elements does not represent a problem for Th/Eu nucleocosmochronology, since both Eu and Th have atomic numbers Z>55.

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