Göttingen 2012 – scientific programme
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T: Fachverband Teilchenphysik
T 108: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 3
T 108.4: Talk
Tuesday, February 28, 2012, 17:35–17:50, ZHG 102
Ab Initio Cosmogenic Background Simulation for the CRESST – II Experiment — •Stephan Scholl1, Josef Jochum1, and Franz Pröbst2 — 1Kepler Center for Astro and Particle Physics, Tübingen — 2Max–Planck–Institut für Physik, München
Today, background induced by cosmogenic neutrons is an important contribution limiting the sensitivity in direct Dark Matter searches like the CRESST – II experiment. As the investigation of the signature of background events becomes more involved, the simulation of the cosmogenically produced neutrons is not sufficient for this task anymore, instead simulations starting from primary muons are required.
In this contribution, such a GEANT4 simulation of primary muons is presented for the CRESST – II experiment at the LN Gran Sasso laboratory which recently reported the observation of an excess signal. The results of this simulation are used to address questions regarding the efficiency of the muon veto, the expected rate of background events and the morphology of cosmogenically induced events.
For events coincident with a hit in the muon veto, the simulation can reproduce the experimentally observed rate and detector hit multiplicity very well.
Having established the agreement between simulation and experiment for events tagged by the muon veto, the disagreement for the simulated non – coincident events and the excess signal seen in the CRESST – II experiment points to the conclusion that another explanation than cosmogenic neutrons must be found for the excess signal.