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This engineering curriculum is designed for students in 6-8 grade where they learn about the concept of polarity and mixing through the phenomenon of oil separating from water by simulating an oil spill that demonstrates the impact of these molecular qualities on the environment. In the first part of the activity, students get familiar with the concept of polarity and how it causes oil to float on water through molecular models and demonstrations. The second part entails a simulation of an oil spill in the ocean, where students are given a variety of tools and will engineer their own solutions to clean up the spill through trial and testing. Finally, they discuss the real-world methods used to clean up oil spills, and their impact on the environment. This engineering curriculum aligns to Next Generation Science Standards.
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Abstract The EXO-200 experiment searched for neutrinoless double-beta decay of 136 Xe with a single-phase liquid xenon detector. It used an active mass of 110 kg of 80.6%-enriched liquid xenon in an ultra-low background time projection chamber with ionization and scintillation detection and readout. This paper describes the design and performance of the various support systems necessary for detector operation, including cryogenics, xenon handling, and controls. Novel features of the system were driven by the need to protect the thin-walled detector chamber containing the liquid xenon, to achieve high chemical purity of the Xe, and to maintain thermal uniformity across the detector.more » « less
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