Heidelberg 2015 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 72: Precision Tests of the Standard Model 2
HK 72.7: Talk
Friday, March 27, 2015, 16:15–16:30, P/H1
Status report of the neutron lifetime experiment tau-SPECT — •Jan Peter Karch1, Marcus Beck1, Simo Dragisic1, Christopher Geppert2, Jan Haak1, Werner Heil1, Sergei Karpuk2, Fabian Kories1, Simon Kunz1, Yury Sobolev1,2, and Dietmar Stepanow1 — 1Institut für Physik, University of Mainz, Germany — 2Institut für Kernchemie, University of Mainz, Germany
The decay of the free neutron into a proton, electron and antineutrino is the prototype of the semi-leptonic weak decay and plays a key role in particle physics and astrophysics. Nowadays, the accuracy achieved is limited by systematic errors, mainly caused by anomalous losses during storage of neutrons (ultracold neutrons) in material vessels. The magnetic storage of neutrons aims to avoid these systematic limitations and is expected to reach an accuracy of 0.1-0.3 s in the lifetime of the neutron. In this talk, the magnetic spectrometer tau-SPECT is presented, which uses a combination of magnetic multipole fields for radial storage and the field configuration of the superconducting aSPECT magnet [1] for longitudinal storage of ultracold neutrons. This storage experiment benefits greatly from the new ultracold neutron source at the pulsable TRIGA reactor Mainz [2]. The talk will give an overview of the experimental status: Proton detection system and adiabatic fast passages device. [1] S. Baeßler et al., Eur. Phys. J. A 38, 17-26 (2008) [2] J. Karch et al., Eur. Phys. J. A 50, 78-88 (2014)