Large Underground Xenon (image) Brown University Caption A new calibration technique fired neutrons directly into the Large Underground Xenon dark matter detector, increasing calibration accuracy by a factor of 10. Analysis based on the calibration confirms that if "low-mass" dark matter particles had passed through the detector during its initial run, Large Underground Xenon would have seen them. Credit Matt Kapust/Sanford Underground Research Facility Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.