铯原子$_2$ LiLaBr $_6$：Ce $^{3+}$中α粒子的脉冲形状鉴别和能量猝灭
Pulse-shape discrimination and energy quenching of alpha particles in Cs$_2$LiLaBr$_6$:Ce$^{3+}$
摘要：
Cs $_2$ LiLaBr $_6$：Ce $^{3+}$（CLLB）是一种钾长石闪烁体，具有出色的线性度和伽马射线能量分辨率，对热中子具有灵敏度，并具有执行脉冲形状鉴别（PSD）以区分伽马和中子的能力。我们对CLLB的研究表明存在固有放射性α背景，我们已确定其来自镧组分的锕污染。我们测量了伽马、热中子和α事件的脉冲形状，并确定可以执行PSD以分离α背景，其具有0.98的中等品质因数。我们还测量了CLLB中α粒子的电子等效能量，并模拟了$^{227}$ Ac的本征α背景，以确定α粒子的猝灭因子。在α粒子能量高于5 MeV时，发现了线性猝灭关系$L_α = E_α \times q + L_0$，猝灭因子为$q = 0.71$ MeVee/MeV，猝灭因子为$L_0 = - 1.19$ MeVee。
英文摘要：
Cs$_2$LiLaBr$_6$:Ce$^{3+}$ (CLLB) is an elpasolite scintillator that offers excellent linearity and gamma-ray energy resolution and sensitivity to thermal neutrons with the ability to perform pulse-shape discrimination (PSD) to distinguish gammas and neutrons. Our investigation of CLLB has indicated the presence of intrinsic radioactive alpha background that we have determined to be from actinium contamination of the lanthanum component. We measured the pulse shapes for gamma, thermal neutron, and alpha events and determined that PSD can be performed to separate the alpha background with a moderate figure of merit of 0.98. We also measured the electron-equivalent-energy of the alpha particles in CLLB and simulated the intrinsic alpha background from $^{227}$Ac to determine the quenching factor of the alphas. A linear quenching relationship $L_α = E_α \times q + L_0$ was found at alpha particle energies above 5 MeV, with a quenching factor $q = 0.71$ MeVee/MeV and an offset $L_0 = - 1.19$ MeVee.
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