Energy resolution in ionization chamber filled with liquefied rare gases at an elevated temperature.

用液化稀有气体填充的电离室具有良好的能量分辨率和输出信号与沉积能量的良好线性关系。例如，液体氩量热计已被用于高物理实验。然而，从理论上讲，预期的能量分辨率要比实验获得的要好得多。本工作的目的是为了获得理论所期望的良好的能量分辨率，或者研究理论和实验在能量分辨率上的不一致。我们发现，只有在相对较低的电场下，才能通过在液体稀有气体中掺杂光致电离分子来提高能量分辨率，而在较高的电场下，这种改善很小，这与Thomas等人提出的‘复合模型’的估计相反。我们的结论是‘重组模型’不是这样的[1]。研究了液化稀有气体的电离产额和闪烁产额，我们对Sguinot等人的一篇论文提出了评论[2]。作为高电离密度的典型例子，我们研究了相对论重离子在掺有光致电离分子的液态Ar量热计中的电离产额和能量分辨率[3]，但目前还没有得到理论估计所期望的良好的能量分辨率。然而，我们已经改进了实验装置，如稀有气体净化器。我们想用改进后的电子系统做更多的实验。

Ionization chambers filled with liquefied rare gases exhibit good energy resolution and good linearity of output signals to the deposited energy. For example, liquid argon calorimeters have been used in high physics experiments. Theoretically, however, far better energy resolution is expected than those experimentally obtained. The purpose of the present work is to obtain the excellent energy resolution as expected by the theory, or to investigate the disagreement of the theory and the experiment on the energy resolution.We investigated the energy resolution in ionization chambers filled with liquefied rare gases doped with photo-ionizing molecules. We found that the energy resolution is improved by doping liquid rare gases with photo-ionizing molecules only at relatively low electric fields and that the improvement is little at high fields, in contrast to the estimation based on the 'Recombination model' proposed by Thomas et al. We concluded that the 'Recombination model' is not the case [1]. Investigating the ionization yield and scintillation yield in liquefied rare gases, we made a comment [2] on a paper by Seguinot et al. As a typical case of high ionization density, we studied the ionization yield and the energy resolution for relativestic heavy ions in liquid argon calorimeter doped with photo-ionizing molecules [3].The excellent energy resolution as expected by the theoretical estimation is not obtained so far. We, however, have improved the experimental apparatus such as purifier of rare gases. We would like to make more experiments by using improved electronics system.