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

TL;DR

This paper reports the first direct measurement of the $^{14}$O superallowed $eta$-decay $Q_{EC}$-value using Penning trap mass spectrometry, significantly improving the precision of this fundamental nuclear parameter.

Contribution

The study provides the first direct $Q_{EC}$-value measurement for $^{14}$O with unprecedented precision, refining superallowed $eta$-decay data crucial for testing the Standard Model.

Findings

$Q_{EC}$-value for $^{14}$O measured as 5144.364(25) keV

Derived superallowed $eta$-decay $Q_{EC}$ value is 2831.566(28) keV

Improved $ extit{ft}$-value of 3073.8(2.8) s

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.