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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Fundamental Symmetries I
HK 33.1: Group Report
Wednesday, March 22, 2023, 14:00–14:30, SCH/A252
τSPECT - A fully magnetic gradient trap to measure the free neutron lifetime — •Martin Fertl for the tauSPECT collaboration — Institut für Physik, Johannes Gutenberg-Universität Mainz
The free neutron lifetime τn critically influences the primordial nucleosynthesis and is indispensible to perform a CKM-matrix unitarity test without nuclear structure corrections related to the extraction of Vud from 0+ → 0+ nuclear transitions. The τSPECT collaboration has implemented a 3D magnetic field gradient trap for ultracold neutrons (UCN) with the aim to determine τn with a statistical sensitivity below 1 s, complementary to the precision obtained with the current state-of-the-art magneto-gravitational UCN traps. Spin-polarized UCN are loaded into the storage volume via a double-spin-flip sequence and counted after a preset storage time with an in-situ UCN detector. This report will introduce the concept, the implementation and results from the commissioning runs at the UCN source facility at TRIGA Mainz.