Background] The structure of the Hoyle state, a highly $\alpha$-clustered state at 7.65 MeV in ${}^{12}C$, has long been the subject of debate. Understanding if the system comprises of three weakly-interacting $\alpha$-particles in the 0s orbital, known as an $\alpha$-condensate state, is possible by studying the decay branches of the Hoyle state. [Method] The direct decay of the Hoyle state into three $\alpha$-particles, rather than through the ${}^{8}Be$ ground state, can be identified by studying the energy partition of the 3 $\alpha$-particles arising from the decay. By using beta-delayed charged-particle spectroscopy of ${}^{12}N$ using the TexAT (Texas Active Target) TPC, a high-sensitivity measurement of this branching ratio can be performed without contributions from pile-up events. [Results] A Bayesian approach to understanding the contribution of the direct components via a likelihood function shows that the direct component is $

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使用TPC进行的霍伊尔态直接衰减分量的几乎无介质测量

背景]霍伊尔州的结构，高度 $\alpha$在7.65 MeV时的群集状态 ${}^{12}C$长期以来一直是辩论的主题。了解系统是否包含三个弱相互作用的系统$\alpha$-0s轨道中的粒子，称为 $\alpha$通过研究霍伊尔态的衰变分支，可以得到-冷凝态。[方法]将霍伊尔状态直接衰减为三个$\alpha$-粒子，而不是通过 ${}^8乙Ë$ 基态，可以通过研究3的能量分配来确定 $\alpha$-由衰变产生的颗粒。通过使用β延迟带电粒子光谱仪${}^{12}ñ$使用TexAT（德克萨斯州主动目标）TPC，可以在没有堆积事件影响的情况下，对该分支比进行高灵敏度的测量。[结果]贝叶斯方法通过似然函数理解直接成分的贡献表明，直接成分为$