Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Fundamentale Wechselwirkungen
HK 3.6: Talk
Monday, March 10, 2008, 15:30–15:45, 2B
Results and present status of the spectrometer aSPECT — •Fidel Ayala Guardia1, Heinz Angerer2, Stefan Baeßler3, Michael Borg1, Klaus Eberhardt4, Ferenc Glück1, Werner Heil1, Igor Konorov2, Gertrud Konrad1, Raquel Munoz Horta1, Gerd Petzoldt2, Martin Simson2, Yury Sobolev1, Hans-Friedrich Wirth2, and Oliver Zimmer2 — 1Institut für Physik, Universität Mainz — 2Physik Department, Technische Universität München — 3Department of Physics, University of Virginia, Charlottesville, USA — 4Institut für Kernchemie, Universität Mainz
The aim of the aSPECT spectrometer is a precise measurement of the proton recoil spectrum in free neutron decay. For kinematic reasons, the shape of the proton spectrum depends on the angular correlation coefficient between the momenta of the electron antineutrino and the electron, a. An accurate measurement of the angular correlation coefficient a is of great interest in order to test the unitarity of the Cabibbo Kobayashi Maskawa Matrix (CKM-Matrix).
A first test beam time was performed during 2005/06 at the beam line MEPHISTO at the neutron research reactor FRM-II in Garching. Results of the data analysis as well as the present status of the aSPECT spectrometer will be presented in this talk.