Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Nuclear Astrophysics V
HK 57.4: Vortrag
Donnerstag, 17. März 2016, 17:30–17:45, S1/01 A04
Silicon photomultiplier readout of a monolithic 270×5×5 cm3 plastic scintillator bar for time of flight applications — •Marko Röder1, Daniel Bemmerer1, Thomas E. Cowan1,2, Stefan Gohl1,2, Klaus Heidel1, Tobias P. Reinhardt2, Stefan Reinicke1,2, Daniel Stach1, Andreas Wagner1, David Weinberger1, and Kai Zuber2 for the R3B collaboration — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden — 2TU Dresden
The detection of 200-1000 MeV neutrons requires large amounts of detector material because of the long nuclear interaction length of these particles. In the example of the NeuLAND neutron time-of-flight detector at FAIR, this is accomplished by using 3000 scintillator bars of 270×5×5 cm3 size made of the fast plastic polyvinyltoluene. In the present work, we investigated whether silicon photomultiplier (SiPM) photosensors can replace fast timing photomultiplier tubes. The response of the system consisting of scintillator, SiPM, and preamplifier was studied using 30 MeV single electrons provided by the ELBE superconducting electron linac. The results were interpreted by a simple Monte Carlo simulation, and the time resolution was found to obey an inverse-square-root scaling law with the number of fired pixels. In the electron beam tests, a time resolution of σt = 136 ps was reached with a pure SiPM readout, well within the design parameters for NeuLAND. — Supported by NupNET NEDENSAA (BMBF 05 P 09 CRFN5), GSI F&E (DR-ZUBE), Helmholtz DTS, and the EU (MUSE, contract no. 690835).