Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA.
Phys Rev Lett. 2011 Oct 28;107(18):182301. doi: 10.1103/PhysRevLett.107.182301. Epub 2011 Oct 27.
A precision measurement of the γ yields following the β decay of (32)Cl has determined its isobaric-analogue branch to be (22.47(-0.18)(+0.21))%. Since it is an almost pure-Fermi decay, we can also determine the amount of isospin-symmetry breaking in this superallowed transition. We find a very large value, δ(C) = 5.3(9)%, in agreement with a shell-model calculation. This result sets a benchmark for isospin-symmetry-breaking calculations and lends support for similarly calculated, yet smaller, corrections that are currently applied to 0+ → 0 + transitions for tests of the standard model.
对 (32)Cl β 衰变后 γ 产额的精确测量确定了其同核异能分支为 (22.47(-0.18)(+0.21))%。由于这是一个几乎纯费米衰变，我们还可以确定这种超允许跃迁中同位旋对称性破缺的程度。我们发现一个非常大的值，δ(C) = 5.3(9)%，与壳模型计算一致。该结果为同位旋对称性破缺计算设定了基准，并为目前应用于标准模型检验的 0+ → 0 + 跃迁的类似计算但较小的修正提供了支持。
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