J. Walton

The EXO-200 detector, part II: auxiliary systems

Nicole L. Ackerman, Justin E Albert, M. Auger, DJ Auty et autres

Abstract The EXO-200 experiment searched for neutrinoless double-beta decay of 136Xe 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 …

us, ch, ca, ru, cn, de (code pays fourni par la source)

Searches for double beta decay of Xe134 with EXO-200

J. B. Albert, G. Anton, I. Badhrees, P. S. Barbeau et autres

Searches for double beta decay of $^{134}\mathrm{Xe}$ were performed with EXO-200, a single-phase liquid xenon detector designed to search for neutrinoless double beta decay of $^{136}\mathrm{Xe}$. Using an exposure of $29.6\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{yr}$, the lower limits of ${\mathrm{T}}_{1/2}^{2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}}>8.7\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }\text{ }\mathrm{yr}$ and ${\mathrm{T}}_{1/2}^{0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}}>1.1\ifmmode\times\else\texttimes\fi{}{10}^{23}\text{ …

us, de, ca, ru, cn, ch (code pays fourni par la source)

Trace radioactive impurities in final construction materials for EXO-200

Douglas S. Leonard, D. J. Auty, T. Didberidze, R. Gornea et autres

us, ca, ch, de, ru, cn (code pays fourni par la source)

Measurement of the drift velocity and transverse diffusion of electrons in liquid xenon with the EXO-200 detector

J. B. Albert, P. S. Barbeau, Diane M. Beck, Vladimir A. Belov et autres

The EXO-200 Collaboration is searching for neutrinoless double $\ensuremath{\beta}$ decay using a liquid xenon (LXe) time projection chamber. This measurement relies on modeling the transport of charge deposits produced by interactions in the LXe to allow discrimination between signal and background events. …

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First search for Lorentz and CPT violation in double beta decay with EXO-200

J. B. Albert, P. S. Barbeau, D. Beck, Vladimir A. Belov et autres

A search for Lorentz- and $CPT$-violating signals in the double beta decay spectrum of $^{136}\mathrm{Xe}$ has been performed using an exposure of $100\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{yr}$ with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz-violation was found, …

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Search for 2νββ decay of Xe136 to the 01+ excited state of Ba136 with the EXO-200 liquid xenon detector

J. B. Albert, D. J. Auty, P. S. Barbeau, D. Beck et autres

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless $\ensuremath{\beta}\ensuremath{\beta}$ decay of $^{136}\mathrm{Xe}$ to the ground state of $^{136}\mathrm{Ba}$. We report here on a search for the two-neutrino $\ensuremath{\beta}\ensuremath{\beta}$ decay of $^{136}\mathrm{Xe}$ to the first ${0}^{+}$ excited state, …

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The search for majoron emission in xenon-136 and two-neutrino double-beta decay of xenon-134 with the enriched xenon observatory

J. Walton

Despite neutrino oscillation experiments firmly establishing neutrinos have non-zero mass, the absolute mass scale is unknown. Moreover, it's unknown whether the neutrino is distinguishable from its antiparticle. The most promising approach for measuring the neutrino mass scale and answering the issue of …

Measurements of the ion fraction and mobility of α− and β -decay products in liquid xenon using the EXO-200 detector

J. B. Albert, D. J. Auty, P. S. Barbeau, Diane M. Beck et autres

Alpha decays in the EXO-200 detector are used to measure the fraction of charged $^{218}\text{Po}$ and $^{214}\text{Bi}$ daughters created from $\ensuremath{\alpha}$ and $\ensuremath{\beta}$ decays, respectively. $^{222}\text{Rn} \ensuremath{\alpha}$ decays in liquid xenon (LXe) are found to produce $^{218}\text{Po}^{+}$ ions $50.3\ifmmode\pm\else\textpm\fi{}3.0%$ of the time, …

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Investigation of radioactivity-induced backgrounds in EXO-200

J. B. Albert, D. J. Auty, P. S. Barbeau, D. Beck et autres

The search for neutrinoless double-beta decay $(0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta})$ requires extremely low background and a good understanding of their sources and their influence on the rate in the region of parameter space relevant to the $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ signal. We report on studies of various $\ensuremath{\beta}$ …

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The Search for Exotic Physics with EXO-200

J. Walton

Spectroscopy of Ba and Ba+ deposits in solid xenon for barium tagging in nEXO

B. Mong, S. Cook, T. Walton, Claire Chambers et autres

Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra for deposits of barium atoms and ions in solid xenon matrices are presented. Excitation spectra for prominent emission lines, temperature dependence, and …

ca, us, cn, de, ch, ru, kr (code pays fourni par la source)

An RF-only ion-funnel for extraction from high-pressure gases

T. Brunner, D. Fudenberg, Victor L. Varentsov, A. Sabourov et autres

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