Primary scintillation characteristics of Ar+CF₄ gas mixtures excited by proton and alpha particles

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• 作者：Jinliang Liu ; Xiaoping Ouyang ; Liang Chen ; Xianpeng Zhang ; Jun Liu ; Zhongbing Zhang ; Jinlu Ruan
• 关键词：Time spectra ; Emission spectra ; CF4 concentration ; Ar+CF4 ; Proton and alpha excitation
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2012
• 出版时间：1 December, 2012
• 年：2012
• 卷：694
• 期：Complete
• 页码：157-161
• 全文大小：815 K

文摘

In this paper, we report how the concentration of carbon-tetrafluoride (CF₄) affects the primary scintillation from Ar+CF₄ gas mixtures excited by proton and alpha particles. The single photon counting method was used to measure the time spectra of the primary scintillation from Ar, CF₄ and their mixtures at atmospheric pressure. Pure Ar exhibits a fast decay time constant, which is approximately 6 ns, and a slow decay time tail. Initially, increases in the concentration of CF₄ increase the decay time of the Ar+CF₄ gas mixture. However, when the concentration of CF₄ exceeds a certain threshold, the decay time decreases to that of pure CF₄, approximately 8-9 ns. We also report the photon emission spectra of Ar+CF₄ mixtures excited by protons. The emission spectrum of the primary scintillation from Ar is improved by CF₄ in both the ultraviolet region and the visible to near-infrared region.