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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 6: Kern- und Teilchen-Astrophysik

HK 6.5: Talk

Friday, March 4, 2005, 15:15–15:30, TU MA144

The Electron Asymmetry A in the Decay of free neutrons — •Daniela Mund1, Hartmut Abele1, Stefan Baeßler2, Markus Brehm1, Jochen Krempel1, Michael Kreuz1,3, Bastian Märkisch1, Alexander Petoukhov3, Marc Schuman1, and Torsten Soldner21Physikalisches Institut Universität Heidelberg — 2Institut für Physik Universität Mainz — 3Institut Laue-Langevin (ILL)

We measured the β-asymmetry A, the correlation between the neutron spin and the electron momentum, in the decay of free polarized neutrons. From A and the neutron lifetime τ, you can derive the first element of the quark mixing CKM matrix, Vud. Previous experimental values on Vud and Vus violate the unitarity condition of the first row of this matrix. Hence we seek for clarification with this measurement.

Our spectrometer PERKEOII was placed at the ILL at the cold neutron beam PF1B. We improved our setup in systematics, like polarisation, background and detector function, and in statistics. We will report about our experiment and its results.

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