title: First Direct Determination of the Superallowed β-Decay QEC Value for (14)O.
abstract: We report the first direct measurement of the (14)O 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. (14)O, along with the other low-Z superallowed β emitter, (10)C, 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.
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.|Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Valverde
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|Facility for Rare Isotope Beams, East Lansing, Michigan 48824 USA.
authors.forename: G
authors.initials: G
authors.lastname: Bollen
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
authors.forename: M
authors.initials: M
authors.lastname: Brodeur
authors.affiliation: Central Michigan University, Mount Pleasant, Michigan 48859, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Bryce
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.|Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: K
authors.initials: K
authors.lastname: Cooper
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.
authors.forename: M
authors.initials: M
authors.lastname: Eibach
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.
authors.forename: K
authors.initials: K
authors.lastname: Gulyuz
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.|Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: C
authors.initials: C
authors.lastname: Izzo
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.|Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Morrissey
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.|Central Michigan University, Mount Pleasant, Michigan 48859, USA.
authors.forename: M
authors.initials: M
authors.lastname: Redshaw
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.
authors.forename: R
authors.initials: R
authors.lastname: Ringle
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.|Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: R
authors.initials: R
authors.lastname: Sandler
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.
authors.forename: S
authors.initials: S
authors.lastname: Schwarz
authors.affiliation: National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824 USA.
authors.forename: C S
authors.initials: CS
authors.lastname: Sumithrarachchi
authors.affiliation: Facility for Rare Isotope Beams, East Lansing, Michigan 48824 USA.
authors.forename: A C C
authors.initials: AC
authors.lastname: Villari