Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 11: Instrumentation IV
HK 11.3: Vortrag
Montag, 10. März 2025, 17:15–17:30, SR Exp1B Chemie
SiPM based neutron detectors for the lifetime experiment τSPECT — •Julian Auler1, Martin Fertl1, and Dieter Ries2 for the tauSPECT collaboration — 1Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany — 2Paul Scherrer Institute, Villigen PSI, Switzerland
The neutron storage experiment τSPECT aims to measure the free neutron lifetime by confining ultracold neutrons (UCNs) in a three-dimensional magnetic trap. A key aspect of this experiment is the detection of UCNs at various locations and times. For this purpose, a multilayer structure consisting of a conversion layer and a scintillator layer on a polyester carrier foil is employed. This design enables flexible coupling to light guides of detectors with diverse geometries. Silicon photomultipliers (SiPMs) are used as photosensors, which are particularly well suited for in-situ detection in τSPECT due to their compatibility with high magnetic fields.
This talk will give an overview of UCN detectors already implemented in τSPECT and discuss recent developments. In particular, we will present our approach to determine the energies of stored UCNs by combining a spatial resolving detector with the magnetic field gradient of the UCN trap. Additionally, a complementary detector in the beamline is employed to monitor fluctuations of the UCN source performance and to normalize measurements in τSPECT accordingly. Lastly, the so-called leakage detector will be introduced, which is intended to investigate systematic effects related to magnetic storage by detecting UCNs that may escape the trap.
Keywords: Neutron detector; Ultracold neutrons; Silicon photomultiplier