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A systematic study of the inclusive ($0\nu+2\nu$) double beta ($\beta\beta$)decay of $^{100}$Mo to various excited final states of $^{100}$Ru wasperformed. Utilizing two large HPGe detectors operated in coincidence, a searchfor the subsequent deexcitation gamma-gamma cascades was conducted. A 1.05-kgsample of isotopically enriched (98.4%) $^{100}$Mo was investigated for 455days, yielding an unambiguous observation of the double beta decay of$^{100}$Mo to the $0_1^+$ state (1130.3 keV) of $^{100}$Ru. This excited finalstate decays via the $0_1^+ \to 2_1^+ \to 0_{gs}^+$ sequence (with$E_{\gamma1}$ = 590.8 keV and $E_{\gamma2}$ = 539.5 keV), and 22 suchcoincidence events were detected, with a continuous background estimated to be2.5 events. This counting rate corresponds to a decay half-life for the$\beta\beta($0^+ rightarrow 0_1^+)$ transition of $T_{1/2}^{(0\nu+2\nu)} = [6.0^{+1.9}_{-1.1} (\rm{stat}) \pm 0.6(\rm{syst})] \times 10^{20}$ years. Lowerlimits on decay half-lives were achieved for higher excited final states.Comment: 10 pages, 8 figures, submitted to Physical Review

physical review. c. nuclear physics/physical review. c, nuclear physics

Double β decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Mo</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>100</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>to excited final states

Double β decay ofMo100to excited final states