Single-shot positron annihilation lifetime spectroscopy with LYSO scintillators
Single-shot positron annihilation lifetime spectroscopy with LYSO scintillators
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DOI：
10.1016/j.nima.2016.05.049
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发表时间：
2016-08
影响因子：
1.4
通讯作者：
A. Alonso;B. Cooper;A. Deller;D. Cassidy
中科院分区：
文献类型：
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作者：
A. Alonso;B. Cooper;A. Deller;D. Cassidy
我们评估了基于氧硅酸镥钇（LYSO）的探测器在单次正电子湮灭寿命光谱中的应用。我们直接将该探测器与类似配置的pbwo4闪烁体进行比较，后者是此类测量的常用选择。我们发现使用LYSO获得的信噪比比使用pbwo4获得的高大约三倍，用于测量激发到较长寿命（Rydberg）水平的Ps，或者当它们在生产后不久被电离时。这是由于LYSO的光输出要高得多（LYSO和pbwo4的NaI分别为75%和1%）。我们得出结论，LYSO是一种理想的闪烁体，用于使用低强度脉冲正电子束进行正电子产生和激发的单次测量。
We have evaluated the application of a lutetium yttrium oxyorthosilicate (LYSO) based detector to single-shot positron annihilation lifetime spectroscopy. We compare this detector directly with a similarly configured PbWO4scintillator, which is the usual choice for such measurements. We find that the signal to noise ratio obtained using LYSO is around three times higher than that obtained using PbWO4for measurements of Ps excited to longer-lived (Rydberg) levels, or when they are ionized soon after production. This is due to the much higher light output for LYSO (75% and 1% of NaI for LYSO and PbWO4respectively). We conclude that LYSO is an ideal scintillator for single-shot measurements of positronium production and excitation performed using a low-intensity pulsed positron beam.