%0 Journal Article
%T The correlation of the $N_A$ measurements by counting $^{28}$Si atoms
%A Michael Borys
%A Ingo Busch
%A Kenichi Fujii
%A Naoki Kuramoto
%A Giovanni Mana
%A Enrico Massa
%A Shigeki Mizushima
%A Tomohiro Narukawa
%A Arnold Nicolaus
%A Axel Pramann
%A Carlo Paolo Sasso
%A Michael Stock
%J Physics
%D 2015
%I arXiv
%R 10.1063/1.4921240
%X An additional value of the Avogadro constant was obtained by counting the atoms in isotopically enriched Si spheres. With respect to the previous determination, the spheres were etched and repolished to eliminate metal contaminations and to improve the roundness. In addition, all the input quantities -- molar mass, lattice parameter, mass, and volume -- were remeasured aiming at a smaller uncertainty. In order to make the values given Refs.\ 1 and 2 usable for a least squares adjustment, we report about the estimate of their correlation.
%U http://arxiv.org/abs/1512.06138v1