Study of silicon photomultipliers for use in neutron decay experiments

Photon readout of plastic scintillators is investigated with the aim of improving the precision of neutron beta decay experiments. Neutron decay is nowadays studied with high statistics, based on up to 10(9) registered decay events, and leads to strongly improved limits on new physics beyond the standard model, with beta s often registered in plastic scintillators. The main systematic errors in these experiments are due to imperfect characterization of the scintillators with respect to linearity, energy resolution, and electron backscattering. We study whether these errors can be diminished when the conventional photomultipliers used for scintillator readout are replaced by silicon photomultipliers (SiPMs). To this end, various theoretical and experimental tools are developed, and a procedure for handling the extreme dark rates of SiPMs is proposed. In beta spectroscopy, so the conclusion, plastic scintillator readout with SiPMs can significantly improve energy response, and help providing reliable corrections for electron backscattering.

Automated summary

The study aims to improve the photon readout of plastic scintillators by replacing traditional photomultipliers with silicon photomultipliers (SiPMs) in order to reduce systematic errors in neutron beta decay experiments. The results show that using SiPMs for plastic scintillator readout can significantly enhance energy response and assist in providing reliable corrections for electron backscattering.