The first experimental investigation of the KLL Auger spectrum of Ni generated in the electron capture decay of radioactive 64Cu in a solid state matrixA.Kh. Inoyatov, L.L. Perevoshchikov, A. Kovalík, D.V. Filosofov, V.M. Gorozhankin and M. RyšavýEur. Phys. J. D, 66 9 (2012) 234DOI: https://doi.org/10.1140/epjd/e2012-20562-2