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A novel method for simultaneous measurement of masses, Q-values, isomerexcitation energies, half-lives and decay branching ratios of exotic nuclei hasbeen demonstrated. The method includes first use of a stopping cell as an iontrap, combining containment of precursors and decay-recoils for variabledurations in a cryogenic stopping cell (CSC), and afterwards the identificationand counting of them by a multiple-reflection time-of-flight mass spectrometer(MR-TOF-MS). Feasibility has been established by recording the decay and growthof $^{216}$Po and $^{212}$Pb (alpha decay) and of $^{119m2}$Sb (t$_{1/2}$ =850$\pm$90 ms) and $^{119g}$Sb (isomer transition), obtaining half-lives andbranching ratios consistent with literature values. Hardly anynon-nuclear-decay losses have been observed in the CSC for up to $\sim$10seconds, which exhibits its extraordinary cleanliness. For $^{119}$Sb, this isthe first direct measurement of the ground and second isomeric state masses,resolving the discrepancies in previous excitation energy data. These resultspave the way for the measurement of branching ratios of exotic nuclei withmultiple decay channels.

A Novel Method for the Measurement of Half-Lives and Decay Branching Ratios of Exotic Nuclei