High-Precision Half-life Measurements for the Superallowed β+ Emitter 14O
oleh: Laffoley A. T., Svensson C. E., Andreoiu C., Austin R. A. E., Ball G. C., Blank B., Bouzomita H., Cross D. S., Diaz Varela A., Dunlop R., Finlay P., Garnsworthy A. B., Garrett P. E., Giovinazzo J., Grinyer G. F., Hackman G., Hadinia B., Jamieson D. S., Ketelhut S., Leach K. G., Leslie J. R., Tardiff E. R., Thomas J. C., Unsworth C.
| Format: | Article |
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| Diterbitkan: | EDP Sciences 2014-03-01 |
Deskripsi
The half-life of 14O, a superallowed Fermi β+ emitter, has been determined via simultaneous γ and β counting experiments at TRIUMF’s Isotope Separator and Accelerator facility. Following the implantation of 14O samples at the center of the 8π spectrometer, a γ counting measurement was performed by detecting the 2313 keV γ-rays emitted from the first excited state of the daughter 14N using 20 high-purity germanium (HPGe) detectors. A simultaneous β counting experiment was performed using a fast plastic scintillator positioned directly behind the implantation site. The results, T½(γ) = 70:632 ± 0:094 s and T½(β) = 70:610 ± 0:030 s, are consistent with one another and, together with eight previous measurements, establish a new average for the 14O half-life of T½ = 70:619 ± 0:011 s with a reduced χ2 of 0.99.