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T: Fachverband Teilchenphysik
T 45: Searches for Dark Matter I
T 45.5: Vortrag
Dienstag, 16. März 2021, 17:00–17:15, Tt
XENONnT Rn222 budget — •Joaquim Palacio Navarro for the XENON collaboration — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany
XENONnt operates a 5.9 ton liquid xenon (LXe) Time Projection Chamber (TPC) to probe WIMP cross sections down to 1.5·10−48cm2 at 90% confidence level for a 50 GeV particle. Such a low background experiment can only be achieved by the combination of shielding from external radiation plus mitigation of the effects from internal detector materials. Among the dominant contributions is emanation of 222Rn, produced by the decay of residual 226Ra present in nearly all materials. Once released, 222Rn may reach the LXe target, inducing low-energetic background events within the sensitive volume. Long-lived daughters 222Rn, can end up located at TPC walls and, due to partial signal lost, can mimic a typical WIMP signal.
Direct 222Rn emanation measurements are hence, very important to prevent higher emanating materials to end up being, directly or indirectly, in contact with the LXe. Even more, a deep understanding of the location from the different 222Rn sources within the system is crucial to define potential mitigation strategies during operation. Through very low-background techniques and the usage of alpha detectors, as proportional counters or radon monitors, we are sensitive to the different alphas produced through the decay chain of emanated 222Rn. In this talk I show the most up-to-date XENONnT 222Rn mapping and present preliminary results on the achieved radon concentration in LXe.