Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 44: Experimentelle Methoden der Astroteilchenphysik II

T 44.7: Vortrag

Dienstag, 20. März 2018, 18:00–18:15, Z6 - SR 2.013

Measurement of luminescence spectra of ultra-purified water and ice — •Sarah Pieper — Bergische Universität Wuppertal, Deutschland

Luminescence is the phenomenon of a medium emitting photons as a deexcitation mechanism, that is exceeding thermal radiation and is delayed concerning the time of excitation. It can be characterized by parameters such as light yield, emission spectrum, and decay times.

It was proposed that luminescence of water and ice can be used as a new detection method at particle detectors that use water or ice as their target medium. These detectors use directly or indirectly produced Cherenkov light as a detection method. Therefore the detection of particles is restricted by their velocities using this method.

Luminescence light, on the other hand, is produced by particles due to their energy transfer to the medium. Therefore particles with a large energy transfer can be detected even below velocity ranges detectable due to Cherenkov light emission. In order to use luminescence light, the characteristics, mentioned above, need to be known for the properties given in these detectors.

As a first step, the characteristics are determined for ultra-purified water and ice. Light yield of ultra-purified water and ice and its temperature dependance in a temperature range from −40^∘C to 20^∘C has already been measured. Measurements of the emission spectrum are ongoing, using different types of radioactive sources for excitation. The present status of this investigation will be presented.