Popis: |
If the Pauli exclusion principle were violated, the electronic structure of Be could be 1s 4 (denoted by Be ′ ) rather than 1s 2 2s 2 . 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. |