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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Fundamentale Symmetrien

HK 44.4: Vortrag

Mittwoch, 23. März 2011, 17:30–17:45, HS2

The Neutron Decay Spectrometer aSPECT: Results of systematic studies — •Michael Borg¹, Marcus Beck¹, Fidel Ayala Guardia¹, Stefan Baeßler², Ferenc Glück³, Werner Heil¹, Igor Konorov⁴, Raquel Muñoz Horta¹, Gertrud Konrad¹, Beatrix Ostrick¹, Martin Simson⁵, Torsten Soldner⁵, Hans-Friedrich Wirth⁶, and Oliver Zimmer⁵ — ¹Institut für Physik, Universität Mainz — ²University of Virginia, Charlottesville, VA, USA — ³IEKP, Universität Karlsruhe (TH) — ⁴Physik-Department E18, TU München — ⁵Institut Laue-Langevin, Grenoble, France — ⁶Fakultät für Physik, LMU München

The purpose of the retardation spectrometer aSPECT is to determine the antineutrino electron angular correlation coefficient a with high precision in free neutron decay. By measuring the recoil spectrum of the proton precisely, a determination of the ratio g_A/g_V of the weak coupling constants becomes possible as well as tests of the validity of the Standard Model. Of great interest are the search for scalar and tensor interactions and to test the unitarity of the CKM matrix. The present error of prior determinations of the coefficient a is δ a/a≈5%.

In a beam time performed at the research reactor of the ILL in Grenoble/ France in April/ May 2008 we achieved a statistical precision of (δ a/a)_stat.<1.4%. The dominating systematical uncertainties have been identified and studied and will be presented in this talk.