闪烁体探测器中光的衰减通式（英文）
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摘要
闪烁体探测器被广泛应用于当今粒子物理与原子核物理实验中。研究闪烁探测器的光衰减规律(LASD)对时间和能量的准确测量都十分重要,这一点对条形闪烁探测器尤为如此。本文以圆柱闪烁探测器为例,对各向同性的闪烁光进行立体角积分,进而研究不同立体角下光程差异对结果的影响。在数值计算的基础上,导出了描述LASD的通用公式。在一定条件下,公式可以约化为双指数衰减形式。对于DAMPE上PSD的实验数据,该公式能使闪烁体远端的拟合偏差从大约10%降低至2%以下。同时,模型也能够很好地描述Kaiser实验、Gierlik实验和Platino实验的实验数据。
Scintillator detectors are widely used in modern nuclear and particle physics experiments. Studying the light attenuation of scintillator detector(LASD) is vitally important for extracting proper measurements of energy and time. In this paper, we integrate the isotropic fluorescence over solid angle to study the influence on overall light-intensity from varying optical path at different angle. Based on numerical results,a universal formula for describing LASD is derived. Under certain condition, our formula can be written as a form of widely-used double-exponential function. The universal formula describes the experimental data of PSD at DAMPE, reducing the maximum deviation at far-side of the scintillator from ～10% to less than 2%. Moreover, our model also deciphers Kaiser's experiment, Gierlik's experiment and Platino's experiment successfully.
Scintillator detectors are widely used in modern nuclear and particle physics experiments. Studying the light attenuation of scintillator detector(LASD) is vitally important for extracting proper measurements of energy and time. In this paper, we integrate the isotropic fluorescence over solid angle to study the influence on overall light-intensity from varying optical path at different angle. Based on numerical results,a universal formula for describing LASD is derived. Under certain condition, our formula can be written as a form of widely-used double-exponential function. The universal formula describes the experimental data of PSD at DAMPE, reducing the maximum deviation at far-side of the scintillator from ～10% to less than 2%. Moreover, our model also deciphers Kaiser's experiment, Gierlik's experiment and Platino's experiment successfully.
引文
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[2]ABLIKIM M,AN Z H,BAI J Z,et al.BESIII Collaboration,Nucl Instr and Meth A,2010,614:345.
[3]CHANG J,AMBROSI G,AN Q,et al.DAMPE Collaboration,Astropart Phys,2017,95:6.
[4]YU Y H,SUN Z Y,SU H,et al.Astropart Phys,2017,94:1.
[5]ZHANG Y P,ZHANG Y J,DONG T K,et al.DAMPECollaboration,Po S 2018,ICRC2017:168.
[6]MENG D,ZHANG Y P,ZHANG Y J,et al.Res Astron Astrophys,2019,19(3):047.
[7]KAISER W C,VILLIERS DE J A M.IEEE Transactions on Nuclear Science,1964,11(3):29.
[8]TAIUTI M,ROSSI P,MORANDOTTI R,et al.Nucl Instr and Meth A,1996,370:429.
[9]GIERLIK M,BATSCH,MARCINKOWSKI R,et al.Nucl Instr and Meth A,2008,593:426.
[10]PLATINO M,HAMPEL M R,ALMELA A,et al.JINST2011,6:P06006.
[11]CHIPAUX R,GELEOC M.Nucl Instr and Meth A,2000,451:610.