Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 34: Kern- und Teilchen-Astrophysik III
HK 34.3: Vortrag
Mittwoch, 19. März 2003, 14:45–15:00, F
LENS I: the prototype phase — •Dario Motta1, Christian Buck1, Francis Xavier Hartmann1, Thierry Lasserre2, Stefan Schönert1, and Ute Schwan1 — 1Max Planck Institut fr Kernphysik, Postfach 103980, 69029 Heidelberg — 2CEA/Saclay, DAPNIA/SPP, 91191 Gif-Sur-Yvette, France
LENS (Low Energy Neutrino Spectroscopy) is a project aiming at the real time, energy resolved and flavor specific measurement of low energy solar neutrinos. The principle of detection is based on the charge current inverse EC-reaction on a suitable AZX target isotope to an isomeric AZ+1Y* state. The ν −tag consists on a prompt e− followed by one ore more delayed γ s. The coincidence of prompt and delayed events ensures a high discrimination power against backgrounds. The LENS collaboration is focusing on 115In as target isotope. The design of the experiment envisages a modular detector, where indium is loaded in a liquid organic scintillator at ≈ 5−10% in weight.
After several years of R&D, LENS has now entered the validation phase with the recent installation and start-up of the first prototype detectors at the LLBF (Lens Low Background Facility) in the Gran Sasso underground laboratories, Italy. The scientific program of the LENS pilot phase is illustrated and the preliminary results of the first measurements on prototype cells are reported. The implications of this experimental studies on the feasibility of the LENS concept for the detection of 7Be−ν and pp−ν solar neutrinos are briefly discussed and the future of the project outlined.