$^{22}$ Na和第二类电流中的$2_1^+ \to 3_1^+$ γ宽度
The $2_1^+ \to 3_1^+$ gamma width in $^{22}$Na and second class currents
摘要：
先前对$^{22}$ Na $β$衰变中$β-γ$方向系数的测量用于提取反冲阶形状因子。数据表明，需要一个显着的诱导张量矩阵元素的decay.This结论在很大程度上依赖于一个标准模型允许的弱磁性形状因子，这是确定使用一个未发表的值的模拟$2_1^+\to3_1^+$ $γ$分支$^{22}$钠，进一步假设的过渡是由其isovector $M1$组件为主。我们首次明确确定了$^{22}$ Na中的$2_1^+ \to 3_1^+$分支为$0.45(8)\%$。使用守恒矢量电流（CVC）假设，我们的分支确定的弱磁性形状因子为$|b/Ac_1| = 8.7(1.1)$ $^{22}$ Na $β$衰变。连同$β-γ$角相关系数，我们得到了一个大的诱导张量形状因子的衰变，继续不同意与理论预测。提出了两种可能的解释。
英文摘要：
A previous measurement of the $β-γ$ directional coefficient in $^{22}$Na $β$ decay was used to extract recoil-order form factors. The data indicate the requirement of a significant induced-tensor matrix element for the decay.This conclusion largely relies on a Standard-Model-allowed weak magnetism form factor which was determined using an unpublished value of the analog $2_1^+\to3_1^+$ $γ$ branch in $^{22}$Na, with the further assumption that the transition is dominated by its isovector $M1$ component. We obtain for the first time an unambiguous determination of the $2_1^+ \to 3_1^+$ branch in $^{22}$Na to be $0.45(8)\%$. Using the Conserved Vector Current (CVC) hypothesis, our branch determines the weak magnetism form factor for $^{22}$Na $β$ decay to be $|b/Ac_1| = 8.7(1.1)$. Together with the $β-γ$ angular correlation coefficient, we obtain a large induced-tensor form factor for the decay that continues to disagree with theoretical predictions. Two plausible explanations are suggested.
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