Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Fundamental Symmetries

HK 26.2: Vortrag

Dienstag, 15. März 2016, 17:00–17:15, S1/01 A02

The neutron lifetime experiment τSPECT — •Marcus Beck^1,2, Klaus Eberhardt^1,2, Christopher Geppert¹, Jan Haack¹, Werner Heil¹, Jan Kahlenberg¹, Jan Karch¹, Sergey Karpuk¹, Fabian Kories¹, Kim Ross¹, Christian Siemensen¹, Yuri Sobolev¹, and Norbert Trautmann¹ — ¹Johannes Gutenberg-Universität Mainz — ²Helmholtz-Institut Mainz

The decay of the free neutron into a proton, electron and antineutrino is the prototype of semi-leptonic weak decays and plays a key role in particle physics and astrophysics.

The most precise measurements of the neutron lifetime to date use ultra-cold neutrons (UCN) stored in material vessels. Their accuracy is limited by systematic errors, mainly caused by anomalous losses of UCN during storage at the vessel walls. With the magnetic storage of neutrons these systematic limitations can be avoided and an accuracy of 0.1-0.3 s for the lifetime of the neutron can be reached.

The neutron lifetime experiment τSPECT has been set up a the research reactor TRIGA Mainz. τSPECT uses a combination of magnetic multipole fields for radial storage and the superconducting aSPECT magnet for longitudinal storage of UCN. In this presentation, the status of τSPECT and the results of first commissioning measurements will be presented.