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arXiv 0911.3041nucl-exastro-ph.IM
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蒸发器中离子猝灭因子的半经验计算

Semi-empirical calculation of quenching factors for ions in scintillators

V. I. Tretyak

备注：
32 pages; accepted in Astropart. Phys
发表信息：
Astropart.Phys.33:40-53,2010
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摘要：

本文介绍了半经验法计算冷却器淬熄系数的方法。它是基于经典的Birks公式与电子和离子的总阻止本领，分别用ESTAR和SRIM程序计算。该方法只有一个拟合参数（Birks因子kB），在不同的测量和数据处理条件下，对于相同的材料可以有不同的值。假设一旦kB值是通过对某一能量区域内的一种粒子的数据进行拟合而得到的，（例如，对于来自探测器内部污染的几个MeV α粒子），它可以用来计算另一种粒子和另一种能量的猝灭因子（例如，对于低能核反冲），如果所有数据都是在相同的实验条件下测量的，并以相同的方式处理。该方法的适用性在许多例子中得到了证明，包括具有不同闪烁机制的材料：有机闪烁体（固体C8 H8和液体C16 H18，C9 H12）;晶体闪烁体（纯CdWO 4，PbWO 4，ZnWO 4，CaWO 4，CeF 3和掺杂的CaF 2（Eu），CsI（Tl），CsI（Na），NaI（Tl））;液体稀有气体（Lion）。对于一些没有实验数据的超导体（CdWO_4，PbWO_4，CeF_3，Bi_4Ge_3 O_（12），LiF，ZnSe），给出了核反冲的猝灭因子的估计。

英文摘要：

Semi-empirical method of calculation of quenching factors for scintillators is described. It is based on classical Birks formula with the total stopping powers for electrons and ions which are calculated with the ESTAR and SRIM codes, respectively. Method has only one fitting parameter (the Birks factor kB) which can have different values for the same material in different conditions of measurements and data treatment. A hypothesis is used that, once the kB value is obtained by fitting data for particles of one kind and in some energy region (e.g. for a few MeV alpha particles from internal contamination of a detector), it can be applied to calculate quenching factors for particles of another kind and for another energies (e.g. for low energy nuclear recoils) if all data are measured in the same experimental conditions and are treated in the same way. Applicability of the method is demonstrated on many examples including materials with different mechanisms of scintillation: organic scintillators (solid C8H8, and liquid C16H18, C9H12); crystal scintillators (pure CdWO4, PbWO4, ZnWO4, CaWO4, CeF3, and doped CaF2(Eu), CsI(Tl), CsI(Na), NaI(Tl)); liquid noble gases (LXe). Estimations of quenching factors for nuclear recoils are also given for some scintillators where experimental data are absent (CdWO4, PbWO4, CeF3, Bi4Ge3O12, LiF, ZnSe).

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