Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 64: Neutrinos, Dunkle Materie und Luftschauer
T 64.6: Talk
Tuesday, March 1, 2016, 18:10–18:25, VMP9 SR 30
Study of the optical properties of the DF2000MA daylight film used in the XENON1T muon veto water tank — •Diego Ramírez — Institut für Physik, Johannes Gutenberg-Universität Mainz
XENON1T is the 3rd stage of a series of experiments performed by the XENON collaboration for the direct detection of dark matter candidates, such as WIMPs. Its projected spin-independent WIMP-nucleon elastic scattering cross-section entails an improvement of two orders of magnitude with respect to Xenon100 and requires, for a fiducial mass of the detector of about 1 ton liquid xenon, a similar reduction in background. In order to minimize the neutron background induced by cosmic ray muons, the XENON1T TPC is placed in the center of a 750 m3 water tank acting as an active Cherenkov muon veto, the walls of which are clad with the high reflective DF2000MA foil by 3M.
The improved setup and results of a dedicated study of the reflective properties of the foil is presented, as well as a measurement of its possible wavelength shifting (WLS) properties. The analysis yields a specular reflectance of ≈ 100% for wavelengths larger than 400 nm, while ≈ 90% of the incoming light with wavelengths smaller than 370 nm is absorbed by the foil. The emission spectra of the WLS are dependent on the absorbed wavelength and show Gaussian shapes, with highest intensities at mean values of ≈ 450 nm emission wavelength.