From Twitter https://twitter.com/: CMS sees first collisions with xenon ions! Read more: https://cms.cern/news/cms-sees-first-collisions-xenon-ions #XeXeAtLHC #heavyions https://twitter.com/CMSexperiment/status/918618816262926336/photo/1 https://chirp.cooleysekula.net/attachment/41532