First direct determination of the superallowed $\beta$-decay $Q_{EC}$-value for ${}^{14}$O

Abstract

We report the first direct measurement of the ${}^{14}\text{O}$ superallowed Fermi $\beta$-decay $Q_{EC}$-value, the last of the so-called "traditional nine" superallowed Fermi $\beta$-decays to be measured with Penning trap mass spectrometry. ${}^{14}$O, along with the other low-$Z$ superallowed $\beta$-emitter, ${}^{10}$C, is crucial for setting limits on the existence of possible scalar currents. The new ground state $Q_{EC}$ value, 5144.364(25) keV, when combined with the energy of the $0^{+}$ daughter state, $E_x(0^{+})=2312.798(11)$~keV [Nucl. Phys. A {\bf{523}}, 1 (1991)], provides a new determination of the superallowed $\beta$-decay $Q_{EC}$ value, $Q_{EC}(\text{sa})=2831.566(28)$ keV, with an order of magnitude improvement in precision, and a similar improvement to the calculated statistical rate function $f$. This is used to calculate an improved $\mathcal{F}t$-value of 3073.8(2.8) s.

5 pages, 5 figures

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• The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results
• Q_EC values of the Superallowed beta Emitters 50Mn and 54Co
• Q-values of the Superallowed beta-Emitters 26m-Al, 42-Sc and 46-V and their impact on V_ud and the Unitarity of the CKM Matrix
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Cited by in corpus (4)

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• Improved Nuclear Physics Near $A=61$ Refines Urca Neutrino Luminosities in Accreted Neutron Star Crusts
• $|V_{ud}|$, $|V_{us}|$, $|V_{cd}|$, $|V_{cs}|$ and charm (semi)leptonic decays: WG1 summary from CKM 2016
• High-precision half-life determination of ${}^{14}$O via direct $\beta$ counting