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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Kern- und Teilchen-Astrophysik
HK 33.2: Talk
Wednesday, March 14, 2007, 14:30–14:45, E
The Neutron Decay Spectrometer aSPECT: Latest Results — •Michael Borg1, Heinz Angerer3, Fidel Ayala Guardia1, Stefan Baeßler1, Laura Cabrera Brito1, Klaus Eberhardt2, Ferenc Glück1, Werner Heil1, Igor Konorov3, Gertrud Konrad1, Laura Cabrera Brito1, Raquel Munoz Horta1, Christopher Allan Palmer1, Gerd Petzoldt3, Dennis Rich4, Martin Simson3, Yuri Sobolev1, Hans-Friedrich Wirth3, and Oliver Zimmer3 — 1Institut für Physik, Universität Mainz — 2Institut für Kernchemie, Universität Mainz — 3Physik Department E18, TU München — 4FRM-II, TU München
The intention of the neutron decay spectrometer aSPECT is the measurement of the proton spectrum in the decay of free neutrons. The proton spectrum is used to deduce the value of the neutrino electron correlation coefficient a, an important experimental quantity which is useful to resolve the problem with the unitarity of the Cabbibo-Kobayashi-Maskawa Matrix.
In a beam time in 2005/ 2006 at the neutron beam MEPHISTO of the research reactor "Forschungsneutronenquelle Heinz Maier-Leibnitz" (FRM-II), first proton spectra have been measured and several systematic tests were performed. In my talk, I will present the physical motivation and the design of our spectrometer, but mainly I will discuss our latest results and the on-going optimizations for the next beam time.