论文标题
高精度半衰期确定$^{14} $ o通过直接$β$计数
High-precision half-life determination of $^{14}$O via direct $β$ counting
论文作者
论文摘要
通过在Triumf的同位素分离器和加速器（ISAC）设施上进行的直接$β$计数实验，确定了超纯的Fermi $β^+$ imitter $^{14} $ O的半衰期。结果，$ t_ {1/2} $（$^{14} $ O）= 70619.2（76）MS，与从11个以前的测量结果获得的世界平均值相一致，但比世界平均值更精确。将当前工作推论的$^{14} $ o半衰期与以前的最精确的测量结果相结合，导致整体不确定性的降低，将近2倍。新世界的平均值为$ t_ {1/2} $（$^{14} $）= 70619.6（63）MS $ $ y的自由度为87的自由度^2 2 2 2 2.6.6（63）n.8 7 qualdies $ i的自由度。
The half-life of the superallowed Fermi $β^+$ emitter $^{14}$O was determined to high precision via a direct $β$ counting experiment performed at the Isotope Separator and Accelerator (ISAC) facility at TRIUMF. The result, $T_{1/2}$($^{14}$O) = 70619.2(76) ms, is consistent with, but is more precise than, the world average obtained from 11 previous measurements. Combining the $^{14}$O half-life deduced in the present work with the previous most precise measurements of this quantity leads to a reduction in the overall uncertainty, by nearly a factor of 2. The new world average is $T_{1/2}$($^{14}$O) = 70619.6(63) ms with a reduced $χ^2$ value of 0.87 obtained from 8 degrees of freedom.
