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- W4387540765 abstract "The ${ensuremath{beta}}^{ensuremath{-}}$ decay $Q$ value of $^{136}mathrm{Cs}$ $({J}^{ensuremath{pi}}={5}^{+}, {t}_{1/2}ensuremath{approx}13 mathrm{d})$ was measured with the JYFLTRAP Penning trap setup at the Ion Guide Isotope Separator On-Line facility of the University of Jyvaskyla, Finland. The monoisotopic samples required in the measurements were prepared with a new scheme utilized 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 technique. The $Q$ value is determined to be 2536.83(45) keV, which is $ensuremath{approx}4$ times more precise and 11.4(20) keV $(ensuremath{approx}6ensuremath{sigma})$ smaller than the adopted value in the most recent Atomic Mass Evaluation AME2020. The daughter, $^{136}mathrm{Ba}$, has a ${4}^{+}$ state at 2544.481(24) keV and a ${3}^{ensuremath{-}}$ state at 2532.653(23) keV, both of which can potentially be ultralow $Q$-value end states for the $^{136}mathrm{Cs}$ decay. With our new ground-to-ground state $Q$ value, the decay energies to these two states become $ensuremath{-}7.65(45)$ keV and 4.18(45) keV, respectively. The former is confirmed to be negative at the level of $ensuremath{approx}17ensuremath{sigma}$, 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 $ensuremath{beta}text{ensuremath{-}}ensuremath{gamma}$ transitions. The decay to the ${3}^{ensuremath{-}}$ 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 $2.{1}_{ensuremath{-}0.8}^{+1.6}ifmmodetimeselsetexttimesfi{}{10}^{12}$ yr. Furthermore, the newly determined low reaction threshold of 79.08(54) keV for the charged-current ${ensuremath{nu}}_{e}+^{136}mathrm{Xe}$ $({0}^{+})ensuremath{rightarrow}phantom{rule{0.16em}{0ex}}^{136}mathrm{Cs}^{*}+phantom{rule{0.16em}{0ex}}{e}^{ensuremath{-}}$ neutrino capture process is used to update the cross sections for a set of neutrino energies relevant to solar $^{7}mathrm{Be}$, pep, and CNO neutrinos. Based on our shell-model calculations, the new lower threshold shows event rates of 2--4 percent higher than the old threshold for several final states reached by the different species of solar neutrinos." @default.
- W4387540765 created "2023-10-12" @default.
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- W4387540765 date "2023-10-11" @default.
- W4387540765 modified "2023-10-17" @default.
- W4387540765 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msup><mml:mi>β</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> decay <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>Q</mml:mi></mml:math> -value measurement of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mmultiscripts><mml:mi>Cs</mml:mi><mml:mprescripts /><mml:none /><mml:mn>136</mml:mn></mml:mmultiscripts></mml:math> and its implications for neutrino studies" @default.
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- W4387540765 doi "https://doi.org/10.1103/physrevc.108.045502" @default.
- W4387540765 hasPublicationYear "2023" @default.
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