First Direct Determination of the Superallowed β -Decay QEC Value for O 14

A. A. Valverde, G. Bollen, M. Brodeur, R. A. Bryce, K. Cooper, M. Eibach, K. Gulyuz, C. Izzo, D. J. Morrissey, M. Redshaw, R. Ringle, R. Sandler, S. Schwarz, C. S. Sumithrarachchi, A. C.C. Villari

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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.

Original languageEnglish
Article number232502
JournalPhysical Review Letters
Issue number23
StatePublished - Jun 12 2015


Dive into the research topics of 'First Direct Determination of the Superallowed β -Decay QEC Value for O 14'. Together they form a unique fingerprint.

Cite this