470 research outputs found

    View of the Capitol at Washington

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    The the hand-colored steel engraving features an outdoor scene in front of the United States Capitol. In the foreground, carriages and groups of people are shown along a road leading to the Capitol. Various trees and buildings line the road. At the center of the background, the Capitol building is depicted. The engraving originally appeared in a publication by N.P. Willis\u27s American Scenery. This particular copy was enclosed in a wooden frame sealed with masking tape but was removed for preservation.https://scholarsjunction.msstate.edu/fvw-prints/1064/thumbnail.jp

    A. Lincoln

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    The engraving features a portrait of Abraham Lincoln surrounded by a decorative oval border. At the top of the border sits a stack of papers, which include the Constitution. Beneath the portrait is a smaller image of Lincoln\u27s cabinet council. The work features hues of yellow, green, blue, black, white, and brown. The engraving possibly is a reversed variant of C.S. German photo.https://scholarsjunction.msstate.edu/fvw-artifacts/1203/thumbnail.jp

    A. Lincoln

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    The engraving features a portrait of Abraham Lincoln surrounded by a decorative oval border. At the top of the border sits a stack of papers, which include the Constitution. Beneath the portrait is a smaller image of Lincoln\u27s cabinet council. The work features hues of yellow, green, blue, black, white, and brown. The engraving possibly is a reversed variant of C.S. German photo.https://scholarsjunction.msstate.edu/fvw-prints/1125/thumbnail.jp

    Observation of single collisionally cooled trapped ions in a buffer gas

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    Individual Ba ions are trapped in a gas-filled linear ion trap and observed with a high signal-to-noise ratio by resonance fluorescence. Single-ion storage times of ~5 min (~1 min) are achieved using He (Ar) as a buffer gas at pressures in the range 8e-5 - 4e-3 torr. Trap dynamics in buffer gases are experimentally studied in the simple case of single ions. In particular, the cooling effects of light gases such as He and Ar and the destabilizing properties of heavier gases such as Xe are studied. A simple model is offered to explain the observed phenomenology.Comment: 5 pages, 4 figures, accepted for publication in Phys. Rev. A. Minor text and figure change

    A linear RFQ ion trap for the Enriched Xenon Observatory

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    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 136^{136}Xe to 136^{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 (136^{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.Comment: 18 pages, pdflatex, submitted to NIM

    First Measurement of Coherent Elastic Neutrino-Nucleus Scattering on Argon

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    We report the first measurement of coherent elastic neutrino-nucleus scattering (\cevns) on argon using a liquid argon detector at the Oak Ridge National Laboratory Spallation Neutron Source. Two independent analyses prefer \cevns over the background-only null hypothesis with greater than 3σ3\sigma significance. The measured cross section, averaged over the incident neutrino flux, is (2.2 ±\pm 0.7) ×\times10−39^{-39} cm2^2 -- consistent with the standard model prediction. The neutron-number dependence of this result, together with that from our previous measurement on CsI, confirms the existence of the \cevns process and provides improved constraints on non-standard neutrino interactions.Comment: 8 pages, 5 figures with 2 pages, 6 figures supplementary material V3: fixes to figs 3,4 V4: fix typo in table 1, V5: replaced missing appendix, V6: fix Eq 1, new fig 3, V7 final version, updated with final revision

    A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory

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    A search has been made for neutrinos from the hep reaction in the Sun and from the diffus
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