High-precision half-life measurements for the superallowed Fermi β+ emitter 14O

A. T. Laffoley, C. E. Svensson, C. Andreoiu, R. A. E. Austin, G. C. Ball, B. Blank, H. Bouzomita, D. S. Cross, A. Diaz Varela, R. Dunlop, P. Finlay, A. B. Garnsworthy, P. E. Garrett, J. Giovinazzo, G. F. Grinyer, G. Hackman, B. Hadinia, D. S. Jamieson, S. Ketelhut, K. G. Leach, J. R. Leslie, E. Tardiff, J. C. Thomas, and C. Unsworth
Phys. Rev. C 88, 015501 – Published 1 July 2013

Abstract

The half-life of the superallowed Fermi β+ emitter 14O has been determined via simultaneous direct β and γ counting experiments at TRIUMF's Isotope Separator and Accelerator (ISAC) facility. A γ-ray counting measurement was performed by detecting the 2312.6-keV γ rays emitted from an excited state of the daughter 14N following the implantation of samples at the center of the 8π γ-ray spectrometer, a spherical array of 20 high-purity germanium (HPGe) detectors. A simultaneous β counting experiment was performed using a fast plastic scintillator positioned behind the implantation site with a solid angle coverage of 20%. The results, T1/2(β)=70.610±0.030s and T1/2(γ)=70.632±0.094s, form a consistent set and, together with eight previous measurements, establish a new average for the 14O half-life of T1/2=70.619±0.011s with a reduced χ2 of 0.99.

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  • Received 1 May 2013

DOI:https://doi.org/10.1103/PhysRevC.88.015501

©2013 American Physical Society

Authors & Affiliations

A. T. Laffoley1,*, C. E. Svensson1, C. Andreoiu2, R. A. E. Austin3, G. C. Ball4, B. Blank5, H. Bouzomita6, D. S. Cross2, A. Diaz Varela1, R. Dunlop1, P. Finlay1,†, A. B. Garnsworthy4, P. E. Garrett1, J. Giovinazzo5, G. F. Grinyer6, G. Hackman4, B. Hadinia1, D. S. Jamieson1, S. Ketelhut4, K. G. Leach1,‡, J. R. Leslie7, E. Tardiff4,§, J. C. Thomas6, and C. Unsworth4

  • 1Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
  • 2Department of Chemistry, Simon Fraser University, Burnaby, British Colombia V5A 1S6, Canada
  • 3Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
  • 4TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 5Centre d'Etudes Nucléaires de Bordeaux Gradignan-Université, Bordeaux 1-UMR 5797 CNRS/IN2P3, Chemin du Solarium, BP 120, F-33175 Gradignan Cedex, France
  • 6Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France
  • 7Department of Physics, Queens University, Kingston, Ontario K7L 3N6, Canada

  • *alaffole@uoguelph.ca
  • Present address: Instituut voor Kern-en Stralingsfysica, K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
  • Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • §Present address: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

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Vol. 88, Iss. 1 — July 2013

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