학술논문
High-Precision Half-life Measurements for the Superallowed β+ Emitter 14O
Document Type
article
Author
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.
Source
EPJ Web of Conferences, Vol 66, p 05012 (2014)
Subject
Language
English
ISSN
2100-014X
Abstract
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.