Half-life of the superallowed β+ emitter Ne18

Le résumé fourni par la source

The half-life of $^{18}\mathrm{Ne}$ has been determined by detecting 1042-keV \ensuremath{\gamma} rays in the daughter $^{18}\mathrm{F}$ following the superallowed-Fermi ${\ensuremath{\beta}}^{+}$ decay of samples implanted at the center of the $8\ensuremath{\pi}\ensuremath{\gamma}$-ray spectrometer, a spherical array of 20 HPGe detectors. Radioactive $^{18}\mathrm{Ne}$ beams were produced on-line, mass-separated, and ionized using an electron-cyclotron-resonance ionization source at the ISAC facility at TRIUMF in Vancouver, Canada. This is the first high-precision half-life measurement of a superallowed Fermi \ensuremath{\beta} decay to utilize both a large-scale HPGe spectrometer and the isotope separation on-line technique. The half-life of $^{18}\mathrm{Ne}$, 1.6656 \ifmmode\pm\else\textpm\fi{} 0.0019 s, deduced following a 1.4\ensuremath{\sigma} correction for detector pulse pile-up, is four times more precise than the previous world average. As part of an investigation into potential systematic effects, the half-life of the heavier isotope $^{23}\mathrm{Ne}$ was determined to be 37.11 \ifmmode\pm\else\textpm\fi{} 0.06 s, a factor of 2 improvement over the previous precision.

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