TY - JOUR
T1 - First Direct Determination of the Superallowed β -Decay QEC Value for O 14
AU - Valverde, A. A.
AU - Bollen, G.
AU - Brodeur, M.
AU - Bryce, R. A.
AU - Cooper, K.
AU - Eibach, M.
AU - Gulyuz, K.
AU - Izzo, C.
AU - Morrissey, D. J.
AU - Redshaw, M.
AU - Ringle, R.
AU - Sandler, R.
AU - Schwarz, S.
AU - Sumithrarachchi, C. S.
AU - Villari, A. C.C.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/6/12
Y1 - 2015/6/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84935904755&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.114.232502
DO - 10.1103/PhysRevLett.114.232502
M3 - Article
AN - SCOPUS:84935904755
SN - 0031-9007
VL - 114
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 232502
ER -