主要示威者的电荷陷阱和能量性能

论文标题

主要示威者的电荷陷阱和能量性能

Charge Trapping and Energy Performance of the MAJORANA DEMONSTRATOR

论文作者

Arnquist, I. J., Avignone III, F. T., Barabash, A. S., Barton, C. J., Bhimani, K. H., Blalock, E., Bos, B., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y-D., Christofferson, C. D., Chu, P. -H., Clark, M. L., Cuesta, C., Detwiler, J. A., Efremenko, Yu., Ejiri, H., Elliott, S. R., Giovanetti, G. K., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Haufe, C. R., Henning, R., Aguilar, D. Hervas, Hoppe, E. W., Hostiuc, A., Kidd, M. F., Kim, I., Kouzes, R. T., Lannen V, T. E., Li, A., López-Castaño, J. M., Martin, E. L., Martin, R. D., Massarczyk, R., Meijer, S. J., Mertens, S., Oli, T. K., Othman, G., Paudel, L. S., Pettus, W., Poon, A. W. P., Radford, D. C., Reine, A. L., Rielage, K., Ruof, N. W., Schaper, D. C., Tedeschi, D., Varner, R. L., Vasilyev, S., Wilkerson, J. F., Wiseman, C., Xu, W., Yu, C. -H., Zhu, B. X.

论文摘要

P型点接触（PPC）高纯晶伐式探测器是Astroparticle和核物理学中的重要技术，因为它们的精美能量分辨率，低噪声和脉搏形状歧视能力。来自Majorana演示器的数据分析是一种富含$^{76} $ ge的PPC检测器的中性s中性s衰减实验，导致了PPC信号分析的一些新颖改进。在这项工作中，我们讨论了PPC探测器中的电荷诱捕及其对能量分辨率的影响。晶格中的小位错或杂质导致电离事件引起的电荷载体，从而减弱信号并降解测得的能量。我们对信号能量估计进行了修改的数字零校正，该信号能量估计会抵消电荷捕获的效果，并将Majorana演示器的能量分辨率提高了约30％，至2039 KEV的2.4 kev fwhm，$^{76} $ ge $ q $ q $ $ $ - value。还提出了一种实现类似分辨率增强的替代方法。

P-type point contact (PPC) high-purity germanium detectors are an important technology in astroparticle and nuclear physics due to their superb energy resolution, low noise, and pulse shape discrimination capabilities. Analysis of data from the MAJORANA DEMONSTRATOR, a neutrinoless double-beta decay experiment deploying PPC detectors enriched in $^{76}$Ge, has led to several novel improvements in the analysis of PPC signals. In this work we discuss charge trapping in PPC detectors and its effect on energy resolution. Small dislocations or impurities in the crystal lattice result in trapping of charge carriers from an ionization event of interest, attenuating the signal and degrading the measured energy. We present a modified digital pole-zero correction to the signal energy estimation that counters the effects of charge trapping and improves the energy resolution of the MAJORANA DEMONSTRATOR by approximately 30% to around 2.4 keV FWHM at 2039 keV, the $^{76}$Ge $Q$-value. An alternative approach achieving similar resolution enhancement is also presented.

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