Testing the atomic structure of beryllium with AMS

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• 作者：Javorsek II ; D. ; Elmore ; D. ; Fischbach ; E. ; Miller ; T. ; Stohler ; M. ; Bourgeois ; M. ; Hillegonds ; D. ; et. al.
• 关键词：31.10.+z ; 13.90.+i ; 32.10.&minus ; f ; Accelerator mass spectrometry ; Pauli exclusion principle
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2002
• 出版时间：July, 2002
• 年：2002
• 卷：194
• 期：1
• 页码：78-89
• 全文大小：627 K

文摘

If the Pauli exclusion principle were violated, the electronic structure of Be could be 1s⁴ (denoted by Be^′) rather than 1s²2s². This paper describes the results of an experimental search for Be^′, carried out at PRIME Lab, the Purdue Rare Isotope Measurement Laboratory. In the process of setting stringent constraints on Be^′ using samples of metallic Be, Be ore, natural gas, and air, we made several modifications to the PRIME Lab facility. These included a new Be-free source and the construction of a gas introduction system which coupled to the existing ion source. The modifications permitted us to reach limits which are a factor of nearly 300 better than those obtained in previous experiments.