First direct high-precision energy determination for the 8.4 and 20.7 keV nuclear transitions in 169Tm A. Kh. Inoyatov, A. Kovalík, D. V. Filosofov, M. Ryšavý, L. L. Perevoshchikov and Yu. B. Gurov Eur. Phys. J. A, 51 6 (2015) 65 Published online: 01 June 2015 DOI: 10.1140/epja/i2015-15065-4