XENON 1T Dark Matter Detector (IMAGE) Rensselaer Polytechnic Institute Caption The XENON1T dark matter collaboration has observed the radioactive decay of xenon-124, which has a half-life of 1.8 X 1022 years Credit XENON1T Usage Restrictions None License Licensed content 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.