Bonn 2010 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Fundamentale Symmetrien I
HK 27.5: Talk
Tuesday, March 16, 2010, 18:00–18:15, HG V
The Neutron Decay Spectrometer aSPECT: Update on data analysis and recent results — •Michael Borg1, Fidel Ayala Guardia1, Stefan Baeßler2, Ferenc Glück3, Werner Heil1, Igor Konorov4, Raquel Muñoz Horta1, Gertrud Konrad1, Beatrix Ostrick1, Martin Simson4,5, Torsten Soldner4,5, Hans-Friedrich Wirth6, and Oliver Zimmer4,5 — 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, tests of the validity of the Standard Model become possible. Of great interest are the search for scalar and tensor interactions and to test the unitarity of the CKM matrix.
From a beam time performed at the research reactor of the ILL in Grenoble/ France in April/ May 2008 we expect a relative precision of δa/a < 5%, which is the present error of prior determinations of a. In this talk selected topics from the on-going data analysis will be presented, including a discussion of the main systematic effects, their corrections and impact on the extracted value of a.