Development of an Active ²³⁸UF₆ Gas Target

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• 作者：C. Eckardt^a ; ^{eckardt@ikp.tu-darmstadt.de} ; J. Enders^a ; M. Freudenberger^a ; A. Gook^a ; P. von Neumann-Cosel^a ; A. Oberstedt^b ; ^c ; S. Oberstedt^d
• 关键词：photo 铿乻sion ; S-DALINAC ; active target ; UF6 ; gaseous detector ; ionization chamber ; electrical properties
• 刊名：Physics Procedia
• 出版年：2012
• 期刊代码：P128_18753892
• 类别：ph
• 出版时间：2012
• 卷：31
• 期：Complete
• 页码：141-146
• 文件大小：1396 K

摘要

At the superconducting 130 MeV Darmstadt electron linac S-DALINAC a new source of spin-polarized electrons using a GaAs cathode has been installed, opening the path for experiments with polarized electron and photon beams for nuclear structure studies at low momentum transfers, e.g., the search for forward-backward asymmetries originating from parity non-conservation (PNC) in the photon-induced 铿乻sion process of ²³⁸U.Detailed studies of different properties, e.g., the energy dependence of 铿乻sion modes, the population of 铿乻sion isomers, or the search for (PNC) effects in the photon-induced 铿乻sion process of ²³⁸U, depends on high quality data, therefore needing high luminosities. An active gas target containing uranium may overcome the problem that large solid target thicknesses cause poor energy and angular resolution.A single Frisch-grid ionization chamber has been built to test a mixture of standard counting gases (e.g., argon) with depleted uraniumhexa铿倁oride (²³⁸UF₆) using a triple alpha source, evaluating signal quality and drift velocity. For mass fractions up to 2 percent of ²³⁸U in the counting gas. The drift velocity increases with rising UF₆ content, while a good signal quality and energy resolution is preserved.