73 research outputs found
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A Linear RFQ Ion Trap for the Enriched Xenon Observatory
The design, construction, and performance of a linear radio-frequency ion trap (RFQ) intended for use in the Enriched Xenon Observatory (EXO) are described. EXO aims to detect the neutrinoless double-beta decay of {sup 136}Xe to {sup 136}Ba. To suppress possible backgrounds EXO will complement the measurement of decay energy and, to some extent, topology of candidate events in a Xe filled detector with the identification of the daughter nucleus ({sup 136}Ba). The ion trap described here is capable of accepting, cooling, and confining individual Ba ions extracted from the site of the candidate double-beta decay event. A single trapped ion can then be identified, with a large signal-to-noise ratio, via laser spectroscopy
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Observation of Single Collisionally Cooled Trapped Ions in a Buffer Gas
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A Liquid Xenon Ionization Chamber in an All-fluoropolymer Vessel
A novel technique has been developed to build vessels for liquid xenon ionization detectors entirely out of ultra-clean fluoropolymer. We describe the advantages in terms of low radioactivity contamination, provide some details of the construction techniques, and show the energy resolution achieved with a prototype all-fluoropolymer ionization detector
Spending More on the Poor? A Comprehensive Summary of State-Specific Responses to School Finance Reforms from 1990–2014
Immigration's Problem Child: Structural Problems Inherent in Removal of 'Sexual Abuse of a Minor' Offenders
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Search for Neutrinoless Double-Beta Decay in Xe with EXO-200
Common Law, Common Sense? How Federal Circuit Courts Have Misapplied the Fourth Amendment and Why Officers Must Be Present to Make a Warrantless Arrest for a Misdemeanor Offense
Second‐Order Devolution or Local Activism?: Local Air Agencies Revisited
In response to calls from previous scholarship for further bottom-up examination of local government roles in environmental policy, the authors revisit local air agencies to examine two separate phenomena occurring in environmental federalism: one from the top-down (second- order devolution) and one from the bottom-up (local activism). Using survey data from local air agencies on devolved authorities to set air quality standards and to enforce federal and/or state standards, the authors identify three different types of local agencies: state administrative sub- units (only enforcement authority), fully devolved agencies (authority to both set and enforce standards), and activist agencies (neither authority). Further findings indicate that state administrative sub-units and fully-devolved agencies are likely functions of second-order devolution, while activist agencies are likely functions of local activism. Conclusions suggest that both top-down and bottom-up approaches to environmental federalism are shaping local government roles in environmental management
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