Experimental evidence of (M1+E2) mixed character of the 9.2 keV transition in ${}^{227}$Th and its consequence for spin-interpretation of low-lying levels

A. Kovalík, A. Kh. Inoyatov, L. L. Perevoshchikov +4

The 9.2 keV nuclear transition in ${}^{227}$Th populated in the $\beta$-decay of ${}^{227}$Ac was studied by means of the internal conversion electron spectroscopy. Its multipolarity was p…