Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Astroteilchenphysik

HK 35.2: Vortrag

Mittwoch, 19. März 2014, 16:45–17:00, HZ 9

Measurements of Proton- and Electron-Quenching in Organic Liquid Scintillators — •Vincenz Zimmer, Paul Hackspacher, Dominikus Hellgartner, Lothar Oberauer, Ludwig Prade, and Jürgen Winter — Technische Universität München

Understanding quenching effects in organic liquid scintillators is vital for various present and future neutrino experiments, like Double Chooz, Borexino, LENA and JUNO.

Electron-quenching plays a crucial role for low energy electron events below about 500 keV, like electron recoil events from Compton-scattering and from ν-e-scattering - especially for solar pp-neutrino events. To measure this effect a coincidence experiment using a scintillation detector and a HPGe-detector has been set up and the analysis of first data shows promising results.

The understanding of proton-quenching is important for both signal and background detection in neutrino experiments. This effect defines the energy scale of ν-p-scattering, which is a major detection channel for supernova-νs. Furthermore, recoil protons from cosmogenic neutrons pose a severe background for the detection of the diffuse supernova neutrino background (DSNB) and reactor neutrinos. A time-of-flight based experiment has been established at the MLL (Garching). Using a pulsed ¹¹B-beam and a fixed H₂-target neutrons with 6−11 MeV are produced to investigate the quenching effect by the resulting proton recoils in different liquid scintillator samples.

This research was supported by the DFG cluster of excellence ’Origin and structure of the Universe’ and the Maier-Leibnitz-Laboratorium.