Detecting New Particles Trapped in Detector Material

We propose a new two-stage detection method for detecting exotic, long lived particles that could be produced in the CMS experiment at the CERN LHC. In stage one the long-lived particles would be stopped by a dedicated absorber made from removable brass rods in the CMS cavern. Then, in stage two, the rods would be removed and individually submerged in liquid argon where decays would be detected. The only expected background would be from cosmic rays which could be controlled, and the new detection method could have unique sensitivity to low mass splitting between the gluino and the neutralino.