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• W4380135945 abstract "The $beta^-$ decay $Q$-value of $^{136}$Cs ($J^pi = 5^+$, $t_{1/2} approx 13$~days) was measured with the JYFLTRAP Penning trap setup at the Ion Guide Isotope Separator On-Line (IGISOL) facility of the University of Jyvaskyla, Finland. The mono-isotopic samples required in the measurements were prepared with a new scheme utilised for the cleaning, based on the coupling of dipolar excitation with Ramsey's method of time-separated oscillatory fields and the phase-imaging ion-cyclotron-resonance (PI-ICR) technique. The $Q$ value is determined to be 2536.83(45) keV, which is $sim$4 times more precise and 11.4(20) keV ($sim$ 6$sigma$) smaller than the adopted value in the most recent Atomic Mass Evaluation AME2020. The daughter, $^{136}$Ba, has a 4$^+$ state at 2544.481(24) keV and a $3^-$ state at 2532.653(23) keV, both of which can potentially be ultralow $Q$-value end-states for the $^{136}$Cs decay. With our new ground-to-ground state $Q$ value, the decay energies to these two states become -7.65(45) keV and 4.18(45) keV, respectively. The former is confirmed to be negative at the level of $sim$ 17$sigma$, which verifies that this transition is not a suitable candidate for neutrino mass determination. On the other hand, the slightly negative $Q$ value makes this transition an interesting candidate for the study of virtual $beta$-$gamma$ transitions. The decay to the 3$^{-}$ state is validated to have a positive low $Q$ value which makes it a viable candidate for neutrino mass determination. For this transition, we obtained a shell-model-based half-life estimate of $2.1_{-0.8}^{+1.6}times10^{12}$ yr." @default.
• W4380135945 created "2023-06-10" @default.
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• W4380135945 date "2023-06-07" @default.
• W4380135945 modified "2023-10-15" @default.
• W4380135945 title "$beta^-$ decay $Q$-value measurement of $^{136}$Cs and its implications to neutrino studies" @default.
• W4380135945 doi "https://doi.org/10.48550/arxiv.2306.04604" @default.
• W4380135945 hasPublicationYear "2023" @default.
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