Double beta decay of $^{150}$Nd to the first $0^+$ excited state of $^{150}$Sm

Two neutrino double beta decay of $^{150}$Nd to the first $0^{+}$ excited state in $^{150}$Sm is investigated with the 400 cm$^3$ low-background HPGe detector. Data analysis for $11320.5$ hours shows the excess of events at $333.9$ keV and $406.5$ keV. This allowsto estimate the half-life of the investigated process as $[1.4^{+0.4}_{-0.2}(\text{stat})\pm 0.3(\text{syst})]\cdot 10^{20}$ yr.