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High-precision half-life measurements for the superallowed Fermi β+ emitter 18Ne.

Authors :
Laffoley, A. T.
Svensson, C. E.
Andreoiu, C.
Ball, G. C.
Bender, P. C.
Bidaman, H.
Bildstein, V.
Blank, B.
Cross, D. S.
Deng, G.
Diaz Varela, A.
Dunlop, M. R.
Dunlop, R.
Garnsworthy, A. B.
Garrett, P. E.
Giovinazzo, J.
Grinyer, G. F.
Grinyer, J.
Hackman, G.
Hadinia, B.
Source :
Physical Review C: Nuclear Physics. Aug2015, Vol. 92 Issue 2, p025502-1-025502-10. 10p.
Publication Year :
2015

Abstract

The half-life of the superallowed Fermi β+ emitter 18Ne has been determined via two high-precision β counting experiments at TRIUMF's Isotope Separator and Accelerator facility. Using two different 4π continuous-flow gas-proportional counters, two independent measurements were made, yielding a weighted average of T1/2=1.66400+0.00057-0.00048 s, which is consistent with but approximately 2 times more precise than a previous high-precision measurement based on γ-ray counting. The present work achieves ±0.034% precision for the 18Ne half-life and will enable the inclusion of 18Ne among the set of precisely measured superallowed Fermi β-decay ft values once improved measurements are made for its Q value and superallowed branching ratio. As a test of systematic uncertainties, the half-life of 23Ne was measured and the world average has been improved, by a factor of 1.7, to 37.148±0.032 s. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
05562813
Volume :
92
Issue :
2
Database :
Academic Search Index
Journal :
Physical Review C: Nuclear Physics
Publication Type :
Academic Journal
Accession number :
109944013
Full Text :
https://doi.org/10.1103/PhysRevC.92.025502