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Journal of High Energy Physics - Our herein described combined analysis of the latest neutrino oscillation data presented at the Neutrino2020 conference shows that previous hints for the neutrino...

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We extend our technique for observing very small concentrations of impurities in xenon gas to the problem of krypton detection. We use a conventional mass spectrometer to identify the krypton content of the xenon, but we improve the sensitivity of the device by more than five orders of magnitude with a liquid nitrogen cold trap. We find that the absolute krypton concentration in the xenon can be inferred from the mass spectrometry measurements, and we identify krypton signals at concentrations as low as 0.5×10−12 mol/mol (Kr/Xe). This technique simplifies the monitoring of krypton backgrounds for WIMP dark matter searches in liquid xenon.

A magnetically driven piston pump for xenon gas recirculation is presented. The pump is designed to satisfy extreme purity and containment requirements, as is appropriate for the recirculation of isotopically enriched xenon through the purification system and large liquid xenon TPC of EXO-200. The pump, using sprung polymer gaskets, is capable of pumping more than 16 standard liters per minute (SLPM) of xenon gas with 750 torr differential pressure.

We report on the first axion search results from the Cryogenic Dark Matter Search (CDMS) experiment at the Soudan Underground Laboratory. An energy threshold of 2 keV for electron-recoil events allows a search for possible solar axion conversion into photons or local galactic axion conversion into electrons in the germanium crystal detectors. The solar axion search sets an upper limit on the Primakov coupling ${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}$ of $2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}\text{ }\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}$ at the 95% confidence level for an axion mass less than $0.1\text{ }\text{ }\mathrm{keV}/{c}^{2}$. This limit benefits from the first precise measurement of the absolute crystal plane orientations in this type of experiment. The galactic axion search analysis sets a world-leading experimental upper limit on the axioelectric coupling ${g}_{a\overline{e}e}$ of $1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}12}$ at the 90% confidence level for an axion mass of $2.5\text{ }\text{ }\mathrm{keV}/{c}^{2}$.

We present the results of a search for WIMPs from the commissioning run of the PandaX-II experiment located at the China Jinping underground Laboratory. A WIMP search data set with an exposure of 306×19.1 kg-day was taken, while its dominant 85Kr background was used as the electron recoil calibration. No WIMP candidates are identified, and a 90% upper limit is set on the spin-independent elastic WIMP-nucleon cross section with a lowest excluded cross section of 2.97×10−45 cm2 at a WIMP mass of 44.7 GeV/c2.

The direct search for dark matter is entering a period of increased sensitivity to the hypothetical Weakly Interacting Massive Particle (WIMP). One su…

'Edgeworth Expansions and Cumulants' published in 'Asymptotic Theory of Statistics and Probability'