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

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

Mar 27, 2015

5 pages

Published in:

Phys.Rev.Lett. 114 (2015) 23, 232502

Published: Jun 12, 2015

e-Print:

1503.08124 [nucl-ex]

DOI:

10.1103/PhysRevLett.114.232502

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Abstract: (APS)

We report the first direct measurement of the O14 superallowed Fermi β-decay QEC value, the last of the so-called “traditional nine” superallowed Fermi β decays to be measured with Penning trap mass spectrometry. O14, along with the other low-Z superallowed β emitter, C10, is crucial for setting limits on the existence of possible scalar currents. The new ground state QEC value, 5144.364(25) keV, when combined with the energy of the 0+ daughter state, Ex(0+)=2312.798(11) keV [F. Ajzenberg-Selove, Nucl. Phys. A523, 1 (1991)], provides a new determination of the superallowed β-decay QEC value, QEC(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 Ft value of 3073.8(2.8) s.

Note:

5 pages, 5 figures

23.40.-s
07.75.+h
27.20.+n
37.10.Ty

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Figures(5)

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