München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 103: Niederenergie-Neutrinophysik & Suche nach dunkler Materie 4
T 103.8: Vortrag
Donnerstag, 12. März 2009, 18:35–18:50, A140
Development of cryogenic detectors for the observation of coherent neutrino nucleus scattering — •Achim Gütlein1, Christian Ciemniak1, Chiara Coppi1, Franz von Feilitzsch1, Christian Isaila1, Tobias Lachenmaier1, Jean Lanfranchi1, Lothar Oberauer1, Sebastian Pfister1, Walter Potzel1, Sabine Roth1, and Wolfgang Westphal1,2 — 1Technische Universität München — 2deceased
Coherent Neutrino Nucleus Scattering (CNNS) is a neutral current weak interaction and thus flavour independent. Due to small transferred momenta (< 50 MeV), neutrinos are scattered coherently off all nucleons. Hence, the cross section is proportional to the square of the neutron number of the target nuclei. However, due to the small transferred momenta and the large mass of the target nucleus the expected recoil energies are quite low (< 2 keV). Our aim is the development of cryogenic detectors with energy thresholds of several 100 eV and absorber masses of about 100 g. Such detectors could be placed in the vicinty of a nuclear power plant to observe CNNS for the first time. Concerning the small expected count rates for CNNS, background suppression and discrimination techniques are crucial for such an experiment. An active shielding of liquid scintillator around the experiment could be used to discriminate and shield neutrons and muons. Moreover, an active veto surrounding every detector module is considered.
This work has been supported by funds of the DFG (Transregio 27: Neutrinos and Beyond), the Excellence Cluster Universe and the Maier-Leibnitz-Laboratorium (Garching).