Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.32: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Low energy proton detection — •Dong Chen, Johannes Bröcker, Walter Carli, F. Joachim Hartmann, Stephan Paul, Gerd Petzoldt, Rüdiger Picker, Wolfgang Schott, and Oliver Zimmer — Physik-Department, Technische Universität München

The neutron life time can be determined in an ultra cold neutron trap experiment by measuring the protons from the neutron β decay( maximum p energy 752  eV) with a large area p detector. Different methods, where the p are measured by scintillators and photon detectors,either directly or via p- induced δ electrons, are being investigated. A complete signal- background separation was obtained by exposing 20 keV p to a bulk Tl dotted CsI crystal connected to a photomultiplier tube. More interesting are thin scintillator layers connected to photo diodes or avalanche photo diodes, which are insensitive to γ rays and can be used in a large magnetic field.