Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Instrumentierung
HK 44.7: Vortrag
Donnerstag, 20. März 2014, 15:30–15:45, HZ 9
Proton detection in the neutron lifetime experiment PENeLOPE — •Christian Tietze for the PENeLOPE collaboration — Technische Universität München, Physik Department E18
Although neutron lifetime plays an important role in the Standard Model of particle physics, τn is not very precisely know and often discussed. The official PDG mean value has been lowered during the last three years by more than 6σ to the new value of 880.0 ± 0.9s. The new precision experiment PENeLOPE, which is currently developed at TU München, will help to clear this up. Ultra-cold neutrons are lossless stored in a magneto-gravitational trap, formed by superconducting coils. The combined determination of τn by counting the surviving neutrons after each storage cycles on one side and in-situ detection of the decay protons on the other side together with a very good handle on systematic errors leads to an unprecedented precision of the neutron lifetime value of 0.1s. This contribution will give an overview of the challenges concerning proton detection under the exceptional requirements of this experiment. The developed concept of using avalanche photodiodes for direct proton detection will be presented as well as results from first measurements with a prototype detector read out by particular developed electronics. This project is supported by the cluster of excellence “Origin and structure of the universe”, the Deutsche Forschungsgemeinschaft and the Maier-Leibnitz Laboratorium, Garching.